QBDW033A0B41Z - ABB - Product.Network

Data Sheet

QBDW033A0B Barracuda* Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Features

 Compliant to RoHS II EU “Directive 2011/65/EU (-Z versions)

 Compliant to REACH Directive (EC) No 1907/2006

 High and flat efficiency profile >95.3% at 12V

, 30% to 100%

rated output

 Wide input voltage range: 36-75V

 Delivers up to 33A

output current

 Remote sense and output voltage trim

 Fully very tightly regulated output voltage

 Output voltage adjust: 8.1V

to 13.2V

 Low output ripple and noise

 Industry standard, DOSA compliant, Quarter brick:

58.4 mm x 36.8 mm x 11.7 mm

(2.30 in x 1.45 in x 0.46 in)

 Constant switching frequency

 Positive remote On/Off logic

 Output over current/voltage protection

 Digital interface with PMBus™ Rev.1.2 compliance^

 Over temperature protection

 Wide operating temperature range (-40°C to 85°C)

 ANSI/ UL

60950-1-2011 Recognized, CAN/CSA

†

C22.2

No.60950-1-07, Second Edition + A1:2011 (MOD) Certified IEC

60950-1:2005 (2nd edition) + A1:2009 and EN 60950-1:2006

+ A11:2009 + A1:2010 + A12:2011, and VDE‡ 0805-1

Licensed

 CE mark 2006/96/EC directives

 Meets the voltage and current requirements for ETSI 300-

132-2 and complies with and licensed for Basic insulation

rating per EN60950-1

 2250 Vdc Isolation tested in compliance with IEEE 802.3

PoE

standards



ISO** 9001 and ISO14001 certified manufacturing facilities

Applications

 Distributed power architectures

 Intermediate bus voltage applications

 Servers and storage applications

 Networking equipment including Power over Ethernet

(PoE)



Fan assemblies other systems requiring a tightly

regulated output voltage

Options

 Negative Remote On/Off logic (1=option code, factory

preferred)

 Auto-restart after fault shutdown (4=option code,

factory preferred)

 Base plate option (-H=option code)

 Passive Droop Load Sharing (-P=option code)

Description

The QBDW033A0B Barracuda series of dc-dc converters are a new generation of DC/DC power modules designed to support 9.6

-12V

intermediate bus applications where multiple low voltages are subsequently generated using point of load (POL)

converters, as well as other application requiring a tightly regulated output voltage. The QBDW033A0B series operate from an

input voltage range of 36 to 75V

and provide up to 33A output current at output voltages from 8.1V

to 12V

, and 400W

output power from output voltages of 12.1V

to 13.2V

in a DOSA standard quarter brick. The converter incorporates digital

control, synchronous rectification technology, a fully regulated control topology, and innovative packaging techniques to achieve

efficiency exceeding 96% peak at 12V

output. This leads to lower power dissipations such that for many applications a heat

sink is not required. Standard features include output voltage trim, remote sense, on/off control, output overcurrent and over

voltage protection, over temperature protection, input under and over voltage lockout, power good signal and PMBus interface.

The output is fully isolated from the input, allowing versatile polarity configurations and grounding connections. Built-in filtering

for both input and output minimizes the need for external filtering.

Trademark of General Electric Company

^ PMBus name and logo are registered trademarks of SMIF, Inc.

# UL is a registered trademark of Underwriters Laboratories, Inc.

† CSA is a registered trademark of Canadian Standards Association.

‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.

§ This product is intended for integration into end-user equipment . All of the required procedures of end-use equipment should be followed.

¤ IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers, Incorporated.

** ISO is a registered trademark of the International Organization of Standards.

RoHS Compliant

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings

only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations

sections of the Data Sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

Parameter Device Symbol Min Max Unit

Input Voltage*

Continuous VIN -0.3 75 Vdc

Operating transient  100mS 100 Vdc

Non- operating continuous VIN 80 100 Vdc

Operating Ambient Temperature All TA -40 85 °C

(See Thermal Considerations section)

Logic Pin Voltage (to SIG_GND or VO(-))

TRIM/C1, C2, ADDR0, ADDR1, CLK, DATA, SMBALERT All Vpin -0.3 3.6 Vdc

Storage Temperature All Tstg -55 125 °C

I/O Isolation Voltage (100% factory Hi-Pot tested) All   2250 Vdc

* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.

Electrical Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

Parameter Device Symbol Min Typ Max Unit

Operating Input Voltage VIN 36 48 75 Vdc

Maximum Input Current IIN,max - - 12 Adc

(VIN=0V to 75V, IO=IO, max)

Input No Load Current All IIN,No load

80 mA

(VIN = VIN, nom, IO = 0, module enabled)

Input Stand-by Current All IIN,stand-by

22 mA

(VIN = VIN, nom, module disabled)

External Input Capacitance All 100 - - F

Inrush Transient All I2t - - 1 A2s

Input Terminal Ripple Current

(Measured at module input pin with maximum specified input

capacitance and ൏ 500uH inductance between voltage source

and input capacitance)

5Hz to 20MHz, VIN= 48V, IO= IOmax

All - 350 - mArms

Input Reflected Ripple Current, peak-to-peak

(5Hz to 20MHz, 12H source impedance; VIN= 48V, IO=

IOmax ; see Figure 10)

All - 40 - mAp-p

Input Ripple Rejection (120Hz) All - 25 - dB

CAUTION: This power module is not internally fused. An input line fuse must always be used.

This power module can be used in a wide variety of applications, ranging from simple standalone operation to an integrated part

of sophisticated power architecture. To preserve maximum flexibility, internal fusing is not included, however, to achieve maximum

safety and system protection, always use an input line fuse. The safety agencies require a fast-acting fuse with a maximum rating

of 30 A (see Safety Considerations section). Based on the information provided in this Data Sheet on inrush energy and maximum

dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer’s Data Sheet for further

information.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Electrical Specifications (continued)

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.

Parameter Device Symbol Min Typ Max Unit

Output Voltage Set-point (Default)

(VIN=VIN,nom, IO=16.5A, TA =25°C)

(Adjustable via PMBus)

All VO, set 11.97 12.00 12.03 Vdc

Output Voltage Variation from Default

(Over all operating input voltage (40V to 75V), resistive

load, and temperature conditions until end of life)

All w/o -

VO 11.76  12.24 Vdc

-P

Option VO 11.63  12.37 Vdc

Output Voltage (VIN=36V, TA = 25ºC) All VO 11.00   Vdc

Output Regulation [VIN, min = 40V]

Line (VIN= VIN, min to VIN, max) All

 0.2  % VO, set

Load (IO=IO, min to IO, max) All w/o -

 0.2  % VO, set

Load (IO=IO, min to IO, max), Intentional Droop -P

Oti

0.50 Vdc

Temperature (TA = -40ºC to +85ºC) All  2  % VO, set

Output Ripple and Noise on nominal output

(VIN=VIN, nom and IO=IO, min to IO, max)

RMS (5Hz to 20MHz bandwidth) All  70  mVrms

Peak-to-Peak (5Hz to 20MHz bandwidth) All  200  mVpk-pk

External Output Capacitance

For CO >5000uF, IO must be < 50% IO, max during Trise. All CO, max 0  10,000 F

Output Current All IO 0 33 Adc

VOUT_OC_FAULT_LIMIT (Default)

(Adjustable via PMBus) All IO,lim  40  Adc

Efficiency

VIN=VIN, nom, TA=25°C

IO=100% IO, max, VO= VO,set All  95.3 %

IO=40% IO, max to 75% IO, max , VO= VO,set All  95.8 %

Switching Frequency fsw 150 kHz

Dynamic Load Response

dIO/dt=1A/10s; Vin=Vin,nom; TA=25°C;

(Tested with a 1.0F ceramic, a 10F tantalum, and

470



F ca

acitor and across the load.)

Load Change from IO = 50% to 75% of IO,max:

Peak Deviation

Settling Time (VO <10% peak deviation)

All Vpk



500

700



mVpk

s

Load Change from IO = 75% to 50% of IO,max:

Peak Deviation

Settling Time (VO <10% peak deviation)

All

Vpk

500

700

mVpk

s

General Specifications

Parameter Device Symbol Typ Unit

Calculated Reliability Based upon Telcordia SR-332 Issue

2: Method I, Case 3, (IO=80%IO, max, TA=40°C, Airflow = 200

LFM), 90% confidence

All MTBF 3,108,685 Hours

All FIT 321.7 109/Hours

Weight – Open Frame 47.4 (1.67) g (oz.)

Weight – with Base plate option 66.4 (2.34) g (oz.)

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Isolation Specifications

Parameter Symbol Min Typ Max Unit

Isolation Capacitance Ciso  1000  pF

Isolation Resistance Riso 10   M

Feature Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See

Feature Descriptions for additional information.

Parameter Device Symbol Min Typ Max Unit

Remote On/Off Signal Interface

(VIN=VIN, min to VIN, max , Signal referenced to VIN- terminal)

Negative Logic: device code suffix “1”

ic Low = module On, Lo

ic Hi

h = module Off

Positive Logic: No device code suffix required

Logic Low = module Off, Logic High = module On

Logic Low Specification

On/Off Thresholds:

Remote On/Off Current – Logic Low (Vin =100V) All Ion/off 280  310 A

Logic Low Voltage All Von/off -0.3  0.8 Vdc

Logic High Voltage – (Typ = Open Collector) All Von/off 2.0  14.5 Vdc

Logic High maximum allowable leakage current

(Von/off = 2.0V) All Ion/off   10 A

Maximum voltage allowed on On/Off pin All Von/off   14.5 Vdc

TON_DELAY and TON_RISE (Adjustable via PMBus)

Tdelay=Time until VO = 10% of VO,set from either

application of Vin with Remote On/Off set to On

(Enable with Vin); or operation of Remote On/Off from

Off to On with Vin already applied for at least 150 milli-

seconds (Enable with on/off). (IO=IO, max)

* Increased Tdelay due to startup for parallel modules.

All w/o -P

Tdelay, Enable with Vin



 150 ms

All w/o-P Tdelay, Enable with

on/off

  10 ms

w/ -P Tdelay, Enable with Vin



 180* ms

w/ -P Tdelay, Enable with

on/off   40* ms

Trise=Time for VO to rise from 10% to 90% of VO,set, For

CO >5000uF, IO must be < 50% IO, max during Trise.

* Increased Trise when Vo exists at startup for parallel

modules.

All w/o -

P Trise   15 ms

w/ -P Trise   300* ms

Load Sharing Current Balance

(difference in output current across all modules with

outputs in parallel, no load to full load)

-P

Option Idiff

3 A

Remote Sense Range All VSense   0.5 Vdc

VOUT_COMMAND (Adjustable via PMBus) All VO, set 8.1 13.2 Vdc

VOUT_OV_FAULT_LIMIT (Adjustable via PMBus) All VO,limit VO,set-

+2.5V VO,set-

+5.0V Vdc

OT_FAULT_LIMIT (Adjustable via PMBus) All Tref  140  °C

Input Undervoltage Lockout (Adjustable via PMBus)

VIN_ON

33 35 36 Vdc

VIN_OFF

31 33 34 Vdc

Input Overvoltage Lockout

(Adjustable via PMBus)

Turn-off Threshold [VIN_OV_FAULT_LIMIT]



85  Vdc

Turn-on Threshold

(follows VIN_OV_FAULT_LIMIT -7V)  78  Vdc

Pull down resistance of PGOOD pin

Sink current capability into PGOOD pin (VPG=2.2V)

All

150



GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Digital Interface Specifications

Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See

Feature Descriptions for additional information.

Parameter Conditions Symbol Min Typ Max Unit

PMBus Signal Interface Characteristics

Input High Voltage (CLK, DATA) VIH 2.1 3.6 V

Input Low Voltage (CLK, DATA) VIL 0.8 V

Input high level current (CLK, DATA) IIH -10 10 A

Input low level current (CLK, DATA) IIL -10 10 A

Output Low Voltage (CLK, DATA, SMBALERT#) IOUT=2mA VOL 0.4 V

Output high level open drain leakage current

(DATA, SMBALERT#) VOUT=3.6V IOH 0 10 A

Pin capacitance CO 0.7 pF

PMBus Operating frequency range

(* 5-10 kHz to accommodate hosts not supporting

clock stretching)

Slave Mode FPMB 5* 400 kHz

Measurement System Characteristics

Output current reading range IOUT(RNG) 1.6500 63.937 A

Output current reading blanking IOUT(BNK) 0 1.5875 A

Output current reading resolution IOUT(RES) 62.5 mA

Output current reading accuracy 16.5A< Iout <33.0A

IOUT(ACC) -5.0 -1.4 3.0 %

Output current reading accuracy (absolute

difference between actual and reported values) 1.65A< Iout <16.5A

IOUT(ACC) -1.7 2.5 A

VOUT reading range VOUT(RNG) 0 15.999

VOUT reading resolution VOUT(RES) 0.244 mV

VOUT reading accuracy VOUT(ACC) -2.0 0.6 2.0 %

VIN reading range VIN(RNG) 0 127.87

VIN reading resolution VIN(RES) 125 mV

VIN reading accuracy VIN(ACC) -4.0 0.8 4.0 %

Temperature reading resolution T(RES) 0.25 °C

Temperature reading accuracy T(ACC) -5.0 5.0 %

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Characteristic Curves

The following figures provide typical characteristics for the QBDW033A0B (12V, 33A) at 25ºC. The figures are identical for either

positive or negative Remote On/Off logic.

INPUT CURRENT, Ii (A)

EFFCIENCY

 (%)

INPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A)

Figure 1. Typical Input Characteristic. Figure 2. Typical Converter Efficiency vs. Output Current.

OUTPUT VOLTAGE,

VO (V) (50mV/div)

OUTPUT CURRENT OUTPUT VOLTAGE

IO (A) (10A/div) VO (V) (200mV/div)

TIME, t (2s/div) TIME, t (500 s/div)

Figure 3. Typical Output Ripple and Noise, Io = Io,max.

Figure 4. Typical Transient Response to 0.1A/µs Step

Change in Load from 50% to 75% to 50% of Full Load,

Co=470µF and 48 Vdc Input.

UTPUT V

LTA

INPUT V

LTA

VO (V) (5V/div) VIN(V) (20V/div)

OUTPUT VOLTAGE On/Off VOLTAGE

VO (V) (5V/div) VON/OFF (V)(2V/div)

TIME, t (20 ms/div)

TIME, t (5 ms/div)

Figure 5. Typical Start-Up Using Vin with Remote On/Off

enabled, negative logic version shown.

Figure 6. Typical Start-Up Using Remote On/Off with Vin

applied, negative logic version shown.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Characteristic Curves (continued)

OUTPUT VOLTAGE, VO (V)

INPUT VOLTAGE, Vin (V) OUTPUT CURRENT, IO (A)

Figure 7. Typical Output Voltage Regulation vs. Input Voltage.

Figure 8. Typical Output Voltage Regulation vs. Output

Current.

OUTPUT VOLTAGE, VO (V)

INPUT VOLTAGE, Vin (V) OUTPUT CURRENT, IO (A)

Figure 9. Typical Output Voltage Regulation vs. Input Voltage

for the –P Version.

Figure 10. Typical Output Voltage Regulation vs. Output

Current for the –P Version.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Test Configurations

Note: Measure input reflected-ripple current with a

simulated

source inductance (LTEST) of 12 µH. Capacitor CS offsets

possible battery impedance. Measure current as shown above.

Figure 11. Input Reflected Ripple Current Test Setup.

Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or

tantalum capacitor. Scope measurement should be made

using a BNC socket. Position the load between

51 mm and 76 mm (2 in. and 3 in.) from the module.

Figure 12. Output Ripple and Noise Test Setup.

Note: All measurements are taken at the module terminals. When

socketing, place Kelvin connections at module terminals to avoid

measurement errors due to socket contact resistance.

Figure 13. Output Voltage and Efficiency Test Setup.

Design Considerations

Input Source Impedance

The power module should be connected to a low

ac-impedance source. A highly inductive source impedance

can affect the stability of the power module. For the test

configuration in Figure 10, a 100F electrolytic capacitor, Cin,

(ESR<0.7 at 100kHz), mounted close to the power module

helps ensure the stability of the unit. If the module is

subjected to rapid on/off cycles, a 330F input capacitor is

required. Consult the factory for further application

guidelines.

Safety Considerations

For safety-agency approval of the system in which the

power module is used, the power module must be installed

in compliance with the spacing and separation

requirements of the end-use safety agency standard, i.e.,

UL60950-1 2nd Ed., CSA C22.2 No. 60950-1 2nd Ed., and

VDE0805-1 EN60950-1 2nd Ed.

If the input source is non-SELV (ELV or a hazardous voltage

greater than 60 Vdc and less than or equal to 75Vdc), for the

module’s output to be considered as meeting the

requirements for safety extra-low voltage (SELV), all of the

following must be true:

 The input source is to be provided with reinforced

insulation from any other hazardous voltages, including

the ac mains.

 One VIN pin and one VOUT pin are to be grounded, or

both the input and output pins are to be kept floating.

 The input pins of the module are not operator

accessible.

 Another SELV reliability test is conducted on the whole

system (combination of supply source and subject

module), as required by the safety agencies, to verify

that under a single fault, hazardous voltages do not

appear at the module’s output.

Note: Do not ground either of the input pins of the module

without grounding one of the output pins. This may

allow a non-SELV voltage to appear between the

output pins and ground.

The power module has safety extra-low voltage (SELV)

outputs when all inputs are SELV.

The input to these units is to be provided with a maximum

30 A fast-acting (or time-delay) fuse in the unearthed lead.

The power module has internally generated voltages

exceeding safety extra-low voltage. Consideration should be

taken to restrict operator accessibility.

LOAD

CONTACT AND

SUPPLY

CONTACT

(+)

(–)

DISTRIBUTION LOSSES

RESISTANCE

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Feature Descriptions

Overcurrent Protection

To provide protection in a fault output overload condition,

the QBDW033A0B module is equipped with internal current-

limiting circuitry and can endure current limiting

continuously. If the overcurrent condition causes the output

voltage to fall below 4.0V, the module will shut down. The

module is factory default configured for auto-restart

operation. The auto-restart feature continually attempts to

restore the operation until fault condition is cleared. If the

output overload condition still exists when the module

restarts, it will shut down again. This operation will continue

indefinitely until the overcurrent condition is corrected.

The IOUT_OC_WARN threshold level, IOUT_OC_FAULT

threshold level, and IOUT_OC_FAULT_RESPONSE can be

reconfigured via the PMBus interface. If the

FAULT_RESPONSE is reconfigured to remain latched off

following an overcurrent shutdown, the overcurrent latch is

reset by either cycling the input power, or by toggling the

on/off pin for one millisecond.

Output Overvoltage Protection

The module contains circuitry to detect and respond to

output overvoltage conditions. If the overvoltage condition

causes the output voltage to rise above the limit in the

Specifications Table, the module will shut down. The

QBDW033A0B module is factory default configured for auto-

restart operation. The auto-restart feature continually

attempts to restore the operation until fault condition is

cleared. If the output overvoltage condition still exists when

the module restarts, it will shut down again. This operation

will continue indefinitely until the overvoltage condition is

corrected.

The VOUT_OV_FAULT threshold level and VOUT_OV_FAULT

_RESPONSE can be reconfigured via the PMBus interface. If

the FAULT _RESPONSE is reconfigured to remain latched off

following an overvoltage shutdown, the overvoltage latch is

reset by either cycling the input power, or by toggling the

on/off pin for one millisecond.

Overtemperature Protection

The modules feature an overtemperature protection circuit

to safeguard against thermal damage. The circuit shuts

down the module when the default maximum device

reference temperature is exceeded. The module is factory

default configured to automatically restart once the

reference temperature cools by ~25°C.

The OT_WARNING and OT_FAULT threshold levels and

OT_FAULT_RESPONSE can be reconfigured via the PMBus

interface. If the FAULT _RESPONSE is reconfigured to remain

latched off following an overtemperature shutdown, the

overtemperature latch is reset by either cycling the input

power or by toggling the on/off pin for one millisecond.

Input Under Voltage Lockout

When Vin exceeds VIN_ON, the module output is enabled,

when Vin falls below VIN_OFF, the module output is

disabled. VIN_ON and VIN_OFF can be reconfigured via the

PMBus interface. A minimum 2V hysteresis between VIN_ON

and VIN_OFF is required.

Input Over Voltage Lockout

The QBDW033A0B module contains circuitry to detect and

respond to input overvoltage conditions. If the overvoltage

condition causes the input voltage to rise above the limit in

the Specifications Table, the module will shut down. The

module is factory default configured for auto-restart

operation. The auto-restart feature continually monitors the

input voltage and will restart the module when the level falls

7V below the VIN_OV_FAULT level.

The VIN_OV_FAULT threshold level can be reconfigured via

the PMBus interface.

Remote On/Off (i)

The module contains a standard on/off control circuit

reference to the VIN(-) terminal. Two factory configured

remote on/off logic options are available. Positive logic

remote on/off turns the module on during a logic-high

voltage on the ON/OFF pin, and off during a logic LO.

Negative logic remote on/off turns the module off during a

logic HI, and on during a logic LO. Negative logic, device

code suffix "1," is the factory-preferred configuration. The

On/Off circuit is powered from an internal bias supply,

derived from the input voltage terminals. To turn the power

module on and off, the user must supply a switch to control

the voltage between the On/Off terminal and the VIN(-)

terminal (Von/off). The switch can be an open collector or

equivalent (see Figure 14). A logic LO is Von/off = -0.3V to 0.8V.

The typical Ion/off during a logic LO (Vin=48V, On/Off

Terminal=0.3V) is 147µA. The switch should maintain a logic-

low voltage while sinking 310µA. During a logic HI, the

maximum Von/off generated by the power module is 8.2V. The

maximum allowable leakage current of the switch at Von/off =

2.0V is 10µA. If using an external voltage source, the

maximum voltage Von/off on the pin is 14.5V with respect to

the VIN(-) terminal.

If not using the remote on/off feature, perform one of the

following to turn the unit on:

For negative logic, short ON/OFF pin to VIN(-).

For positive logic: leave ON/OFF pin open.

Figure 14. Remote On/Off Implementation.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Feature Descriptions (continued)

Load Sharing

For higher power requirements, the QBDW033A0 power

module offers an optional feature for parallel operation (-P

Option code). This feature provides a precise forced output

voltage load regulation droop characteristic. The output set

point and droop slope are factory calibrated to insure

optimum matching of multiple modules’ load regulation

characteristics. To implement load sharing, the following

requirements should be followed:

 The VOUT(+) and VOUT(-) pins of all parallel modules must be

connected together. Balance the trace resistance for each

module’s path to the output power planes, to insure best

load sharing and operating temperature balance.

 VIN must remain between 40Vdc and 75Vdc for droop

sharing to be functional.

 It is permissible to use a common Remote On/Off signal to

start all modules in parallel.

 These modules contain means to block reverse current

flow upon start-up, when output voltage is present from

other parallel modules, thus eliminating the requirement

for external output ORing devices. Modules with the –P

option will self determine the presence of voltage on the

output from other operating modules, and automatically

increase its Turn On delay, Tdelay, as specified in the Feature

Specifications Table.

 When parallel modules startup into a pre-biased output,

e.g. partially discharged output capacitance, the Trise is

automatically increased, as specified in the Feature

Specifications Table, to insure graceful startup.

 Insure that the load is <50% IO,MAX (for a single module) until

all parallel modules have started (load full start > module

Tdelay time max + Trise time).

 If fault tolerance is desired in parallel applications, output

ORing devices should be used to prevent a single module

failure from collapsing the load bus.

Remote Sense

Remote sense minimizes the effects of distribution losses by

regulating the voltage at the remote-sense connections (See

Figure 15). The SENSE(-) pin should be always connected to

VO(–).The voltage between the remote-sense pins and the

output terminals must not exceed the output voltage sense

range given in the Feature Specifications table:

[VO(+) – VO(–)] – [SENSE(+) ]  0.5 V

Although the output voltage can be increased by both the

remote sense and by the trim, the maximum increase for

the output voltage is not the sum of both. The maximum

increase is the larger of either the remote sense or the trim.

The amount of power delivered by the module is defined as

the voltage at the output terminals multiplied by the output

current. When using remote sense and trim, the output

voltage of the module can be increased, which at the same

output current, would increase the power output of the

module. Care should be taken to ensure that the maximum

output power of the module remains at or below the

maximum rated power (Maximum rated power = Vo,set x

Io,max).

Figure 15. Circuit

Configuration for remote sense.

Configurable Control Pins

The QBDW033A0B contains two configurable control pins,

T/C1 and C2, referenced to the module secondary SIG_GND.

See Mechanical Views for pin locations. The following table

list the default factory configurations for the functions

assigned to these pins. Additional configurations can be

accomplished via the PMBus command,

MFR_CPIN_ARA_CONFIG. Following the table, there is a

feature description for each function.

Designation/Function Module

Code Configuration

T/C1

On/Off (O)

Power Good w/o -P Factory Default

Trim On/Off (O) w/o -P Via PMBus

Trim Power Good w/o -P Via PMBus

On/Off (O)

Power Good

with -P Factory Default

Remote On/Off(o)

The module contains an additional remote on/off control

input On/Off(o), via either the T/C1 or C2 pin, reference to the

VO(-) terminal. The factory default configuration is set to

ignore this input, unless activated by the PMBus command,

MFR_ CPIN_ON_OFF_CONFIG. This command is also used to

configure the logic for the On/Off(o) pin. Positive logic

remote on/off turns the module on during a logic-high

voltage on the ON/OFF pin, and off during a logic low.

Negative logic remote on/off turns the module off during a

logic high, and on during a logic low. The On/Off(o) circuit is

powered from an internal bias supply, referenced to

SIG_GND. To turn the power module on and off, the user

must supply a switch to control the voltage between the

On/Off (o) terminal and the VO(-) terminal (Von/off(o)). The

switch can be an open collector or equivalent (see Figure

13). A logic low is Von/off(o) = -0.3V to 0.8V. The typical Ion/off(o)

during a logic low is 330µA. The switch should maintain a

logic-low voltage while sinking 250µA. During a logic high,

the maximum Von/off(o) generated by the power module is

3.3V. The maximum allowable leakage current of the switch

at Von/off(o) = 2.0V is 130µA. If using an external voltage

source, the maximum voltage Von/off on the pin is 3.3V with

respect to the Vi(-) terminal.

If not using the Remote On/Off(o) feature, the pin may be

left N/C.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Feature Descriptions (continued)

Power Good, PG

The QBDW033A0B module provides a Power Good (PG)

feature, which compares the module’s output voltage to the

module’s POWER_GOOD_ON and POWER_GOOD_OFF

values. These values are adjustable via PMBus. PG is

asserted when the module’s output voltage is above the

POWER_GOOD_ON value, and PG is de-asserted if any

condition such as overtemperature, overcurrent or loss of

regulation occurs that would result in the output voltage

going below the POWER_GOOD_OFF value.

The PG signal, provided on pin C2, is implemented with an

open-drain node, pulled up via a 10k resistor to 3.3V

internally. For Positive Logic PG (default), the PG signal is HI,

when PG is asserted, and LO, when the PG is de-asserted.

For Negative Logic PG, the PG signal is LO, when PG is

asserted, and HI, when the PG is de-asserted.

The PMBus command MFR_PGOOD _POLARITY is used to set

the logic polarity of the signal.

If not using the Power Good feature, the pin may be left

N/C.

Trim, Output Voltage Programming

Trimming allows the output voltage set point to be

increased or decreased; this is accomplished by connecting

an external resistor between the TRIM pin and either the

VO(+) pin or the VO(-) pin.

VO(+)

T/C1

VO(-)

Rtri m-d ow n

LOAD

QBDW033A0B

Rtrim-up

Figure 16. Circuit Configuration to Trim Output Voltage.

Connecting an external resistor (Rtrim-down) between the T/C1

pin and the Vo(-) (or Sense(-)) pin decreases the output

voltage set point. To maintain set point accuracy, the trim

resistor tolerance should be ±1.0%.

The following equation determines the required external

resistor value to obtain a percentage output voltage change

of %.



















22.10

511

downtrim

Where 100

0.12

%













 V

VV desired

For example, to trim-down the output voltage of the module

by 20% to 9.6V, Rtrim-down is calculated as follows:

20%

















22.10

511

downtrim



kR downtrim 3.15

Connecting an external resistor (Rtrim-up) between the T/C1

pin and the VO(+) (or Sense (+)) pin increases the output

voltage set point. The following equations determine the

required external resistor value to obtain a percentage

output voltage change of %:

























22.10

511

%225.1 %)100(0.1211.5 V

Ruptrim

Where 100

0.12 0.12

%













 VVVdesired

For example, to trim-up the output voltage of the module by

5% to 12.6V, Rtrim-up is calculated is as follows:

5% 























22.10

511

5225.1 )5100(0.1211.5

uptrim



8.938

uptrim

The voltage between the Vo(+) and Vo(–) terminals must not

exceed the minimum output overvoltage protection value

shown in the Feature Specifications table. This limit includes

any increase in voltage due to remote-sense compensation

and output voltage set-point adjustment trim.

Although the output voltage can be increased by both the

remote sense and by the trim, the maximum increase for

the output voltage is not the sum of both. The maximum

increase is the larger of either the remote sense or the trim.

The amount of power delivered by the module is defined as

the voltage at the output terminals multiplied by the output

current. When using remote sense and trim, the output

voltage of the module can be increased, which at the same

output current would increase the power output of the

module. Care should be taken to ensure that the maximum

output power of the module remains at or below the

maximum rated power (Maximum rated power = VO,set x

IO,max).

Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Feature Descriptions (continued)

Thermal Considerations

The thermal data presented here is based on physical

measurements taken in a wind tunnel, using automated

thermo-couple instrumentation to monitor key component

temperatures: FETs, diodes, control ICs, magnetic cores,

ceramic capacitors, opto-isolators, and module pwb

conductors, while controlling the ambient airflow rate and

temperature. For a given airflow and ambient temperature,

the module output power is increased, until one (or more) of

the components reaches its maximum derated operating

temperature, as defined in IPC-9592B. This procedure is then

repeated for a different airflow or ambient temperature until

a family of module output derating curves is obtained.

The power modules operate in a variety of thermal

environments and sufficient cooling should be provided to

help ensure reliable operation. Thermal considerations

include ambient temperature, airflow, module power

dissipation, and the need for increased reliability. A

reduction in the operating temperature of the module will

result in an increase in reliability.

Heat-dissipating components are mounted on the top side

of the module. Heat is removed by conduction, convection

and radiation to the surrounding environment. Proper

cooling can be verified by measuring the thermal reference

temperature (TH

or TH

). Peak temperature occurs at the

position indicated in Figure 17 and 18. For reliable operation

this temperature should not exceed TH

=125°C or

=105°C. For extremely high reliability you can limit this

temperature to a lower value.

Figure 17. Location of the thermal reference temperature

TH.

Figure 18. Location of the thermal reference temperature

TH3 for Baseplate module.

The output power of the module should not exceed the

rated power for the module as listed in the Ordering

Information table.

Please refer to the Application Note “Thermal

Characterization Process For Open-Frame Board-Mounted

Power Modules” for a detailed discussion of thermal aspects

including maximum device temperatures.

Heat Transfer via Convection

Increased airflow over the module enhances the heat

transfer via convection. The thermal derating of figure 19-

23 shows the maximum output current that can be

delivered by each module in the indicated orientation

without exceeding the maximum TH

temperature versus

local ambient temperature (T

) for several air flow

conditions.

The use of Figure 19 is shown in the following example:

Example

What is the minimum airflow necessary for a QBDW033A0B

operating at V

= 48 V, an output current of 20A, and a

maximum ambient temperature of 60 °C in transverse

orientation.

Solution:

Given: V

= 48V, I

= 20A, T

= 60 °C

Determine required airflow velocity (Use Figure 19):

Velocity = 0.5m/s (100 LFM) or greater.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Thermal Considerations (continued)

OUTPUT CURRENT, IO (A)

LOCAL AMBIENT TEMPERATURE, TA (C)

Figure 19. Output Current Derating for the Open Frame

QBVW033A0B in the Transverse Orientation; Airflow

Direction from Vin(-) to Vin(+); Vin = 48V.

Figure 22. Output Current Derating for the Base plate

QBVW033A0B-H with 0.5” heatsink in the Transverse

Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V

OUTPUT CURRENT, IO (A)

LOCAL AMBIENT TEMPERATURE, TA (C)

Figure 20. Output Current Derating for the Base plate

QBVW033A0B-H in the Transverse Orientation; Airflow

Direction from Vin(-) to Vin(+); Vin = 48V.

Figure 23. Output Current Derating for the Base plate

QBVW033A0B-H with 1.0” heatsink in the Transverse

Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V.

OUTPUT CURRENT, IO (A)

LOCAL AMBIENT TEMPERATURE, TA

(C)

COLD WALL TEMPERATURE, TC (C)

Figure 21. Output Current Derating for the Base plate

QBVW033A0B-H with 0.25” heatsink in the Transverse

Orientation; Airflow Direction from Vin(-) to Vin(+); Vin =

48V

Figure 24. Output Current Derating for the Base Plate

QBVW033A0B-H in a Cold wall application; Local Internal Air

Temperature near module=80C, VIN = 48V, VOUT setting

anywhere from 6.0V to 12.0V.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Layout Considerations

The QBDW033A0B power module series are low profile in

order to be used in fine pitch system card architectures. As

such, component clearance between the bottom of the

power module and the mounting board is limited. Avoid

placing copper areas on the outer layer directly underneath

the power module. Also avoid placing via interconnects

underneath the power module.

For additional layout guide-lines, refer to FLTR100V10 Data

Sheet.

Through-Hole Lead-Free Soldering

Information

The RoHS-compliant, Z version, through-hole products use

the SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant

components. The non-Z version products use lead-tin

(Pb/Sn) solder and RoHS-compliant components. Both

version modules are designed to be processed through

single or dual wave soldering machines. The pins have an

RoHS-compliant, pure tin finish that is compatible with both

Pb and Pb-free wave soldering processes. A maximum

preheat rate of 3C/s is suggested. The wave preheat

process should be such that the temperature of the power

module board is kept below 210C. For Pb solder, the

recommended pot temperature is 260C, while the Pb-free

solder pot is 270C max. Not all RoHS-compliant through-

hole products can be processed with paste-through-hole Pb

or Pb-free reflow process. If additional information is

needed, please consult with your GE representative for more

details.

Reflow Lead-Free Soldering Information

The RoHS-compliant through-hole products can be

processed with the following paste-through-hole Pb or Pb-

free reflow process.

Max. sustain temperature :

245C (J-STD-020C Table 4-2: Packaging Thickness>=2.5mm

/ Volume > 2000mm3),

Peak temperature over 245C is not suggested due to the

potential reliability risk of components under continuous

high-temperature.

Min. sustain duration above 217C : 90 seconds

Min. sustain duration above 180C : 150 seconds

Max. heat up rate: 3C/sec

Max. cool down rate: 4C/sec

In compliance with JEDEC J-STD-020C spec for 2 times

reflow requirement.

Pb-free Reflow Profile

BMP module will comply with J-STD-020 Rev. C

(Moisture/Reflow Sensitivity Classification for

Nonhermetic Solid State Surface Mount Devices) for both

Pb-free solder profiles and MSL classification

procedures. BMP will comply with JEDEC J-STD-020C

specification for 3 times reflow requirement. The suggested

Pb-free solder paste is Sn/Ag/Cu (SAC). The recommended

linear reflow profile using Sn/Ag/Cu solder is shown in Figure

24.

Figure 24. Recommended linear reflow profile using

Sn/Ag/Cu solder.

MSL Rating

The QBDW033A0B modules have a MSL rating of 2a.

Storage and Handling

The recommended storage environment and handling

procedures for moisture-sensitive surface mount packages

is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping

and Use of Moisture/Reflow Sensitive Surface Mount

Devices). Moisture barrier bags (MBB) with desiccant are

required for MSL ratings of 2 or greater. These sealed

packages should not be broken until time of use. Once the

original package is broken, the floor life of the product at

conditions of 30°C and 60% relative humidity varies

according to the MSL rating (see J-STD-033A). The shelf life

for dry packed SMT packages will be a minimum of 12

months from the bag seal date, when stored at the following

conditions: < 40° C, < 90% relative humidity.

Post Solder Cleaning and Drying

Considerations

Post solder cleaning is usually the final circuit-board

assembly process prior to electrical board testing. The result

of inadequate cleaning and drying can affect both the

reliability of a power module and the testability of the

finished circuit-board assembly. For guidance on

appropriate soldering, cleaning and drying procedures, refer

to GE Board Mounted Power Modules: Soldering and

Cleaning Application Note (AP01-056EPS).

EMC Considerations

The circuit and plots in Figure 25 shows a suggested

configuration to meet the conducted emission limits of

EN55022 Class A. For further information on designing for

EMC compliance, please refer to the FLT012A0Z data sheet.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Figure 25. EMC Consideration

Packaging Details

All versions of the QBDW033A0B are supplied as standard in

the plastic trays shown in Figure 26. Each tray contains a total

of 12 power modules. The trays are self-stacking and each

shipping box for the QBDW033A0B module contains 2 full

trays plus one empty hold-down tray giving a total number of

24 power modules.

Tray Specification

Material PET (1mm)

Max surface resistivity

109 -1011/PET

Color Clear

Capacity 12 power modules

Min order quantity

24 pcs (1 box of 2 full trays + 1 empty top tray)

Open Frame Module Tray Base Plate Module Tray

Figure 26. QBDW033 Packaging Tray

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Digital Feature Descriptions

PMBus Interface Capability

The QBDW033A0B series is equipped with a digital PMBus

interface to allow the module to be configured, and

communicate with system controllers. Detailed timing and

electrical characteristics of the PMBus can be found in the

PMB Power Management Protocol Specification, Part 1,

revision 1.2, available at http://pmbus.org. The QBDW033A0B

supports both the 100kHz and 400kHz bus timing

requirements. The QBDW033A0B shall stretch the clock, as

long as it does not exceed the maximum clock LO period of

35ms. The QBDW033A0B will check the Packet Error

Checking scheme (PEC) byte, if provided by the PMBus

master, and include a PEC byte in all responses to the master.

However, the QBDW033A0B does not require a PEC byte from

the PMBus master.

The QBDW033A0B supports a subset of the commands in the

PMBus 1.2 specification. Most all of the controller parameters

can be programmed using the PMBus and stored as defaults

for later use. All commands that require data input or output

use the linear format. The exponent of the data words is fixed

at a reasonable value for the command and altering the

exponent is not supported. Direct format data input or

output is not supported by the QBDW033A0B. The supported

commands are described in greater detail below.

The QBDW033A0B contains non-volatile memory that is used

to store configuration settings and scale factors. The settings

programmed into the device are not automatically saved into

this non-volatile memory though. The STORE_DEFAULT_ALL

command must be used to commit the current settings to

non-volatile memory as device defaults. The settings that are

capable of being stored in non-volatile memory are noted in

their detailed descriptions.

SMBALERT Interface Capability

The QBDW033A0B also supports the SMBALERT response

protocol. The SMBALERT response protocol is a mechanism

through which the QBDW033A0B can alert the PMBus master

that it has an active status or alarm condition via pulling the

SMBALERT pin to an active low. The master processes this

condition, and simultaneously addresses all slaves on the

PMBus through the Alert Response Address. Only the slave(s)

that caused the alert (and that support the protocol)

acknowledges this request. The master performs a modified

receive byte operation to get the slave’s address. At this

point, the master can use the PMBus status commands to

query the slave that caused the alert. Note: The

QBDW033A0B can only respond to a single address at any

given time. Therefore, the factory default state for the

QBDW033A0B module is to retain it’s resistor programmed

address, when it is in an ALERT active condition, and not

respond to the ARA. This allows master systems, which do not

support ARA, to continue to communicate with the slave

QBDW033A0B using the programmed address, and using the

various READ_STATUS commands to determine the cause for

the SMBALERT. The CLEAR_FAULTS command will retire the

active SMBALERT. However, when the QBDW033A0B module

is used in systems that do support ARA, Bit 4 of the

MFR_CPIN_ARA_CONFIG command can be used to

reconfigure the module to utilize ARA. In this case, the

QBDW033A0B will no longer respond to its programmed

address, when in an ALERT active state. The master is

expected to perform the modified received byte operation,

and retire the ALERT active signal. At this time, the

QBDW033A0B will return to it’s resistor programmed address,

allowing normal master-slave communications to proceed.

The QBDW033A0B does not contain capability to arbitrate

data bus contention caused by multiple modules responding

to the modified received byte operation. Therefore, when the

ARA is used in a multiple module PMBus application, it is

necessary to have the QBDW033A0B module at the lowest

programmed address in order for the host to properly

determine all modules’ address that are associated with an

active SMBAlert. Please contact your GE sales representative

for further assistance, and for more information on the

SMBus alert response protocol, see the System Management

Bus (SMBus) specification.

PMBus Addressing

The power module can be addressed through the PMBus

using a device address. The module has 64 possible

addresses (0 to 63 in decimal) which can be set using

resistors connected from the ADDR0 and ADDR1 pins to GND.

Note that some of these addresses (0 through 12, 40, 44, 45,

and 55 in decimal) are reserved according to the SMBus

specifications and may not be useable. The address is set in

the form of two octal (0 to 7) digits, with each pin setting one

digit. The ADDR1 pin sets the high order digit and ADDR0 sets

the low order digit. The resistor values suggested for each

digit are shown in Table 4 (1% tolerance resistors are

recommended).

Table 4

Digit

Resistor Value (KΩ)

0 10

1 15.4

2 23.7

3 36.5

4 54.9

5 84.5

6 130

7 200

DDR0

SIG_GND

ADDR0

ADDR1

DDR1

Figure 27. Circuit showing connection of resistors used to

set the PMBus address of the module.

The user must know which I2C addresses are reserved in a

system for special functions and set the address of the

module to avoid interfering with other system operations.

Both 100kHz and 400kHz bus speeds are supported by the

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

module. Connection for the PMBus interface should follow the

High Power DC specifications given in section 3.1.3 in the

SMBus specification V2.0 for the 400kHz bus speed or the

Low Power DC specifications in section 3.1.2. The complete

SMBus specification is available from the SMBus web site,

smbus.org.

PMBus Data Format

For commands that set or report any voltage thresholds

related to output voltage (including VOUT_COMMAND,

VOUT_MARGIN, POWER_GOOD and READ_VOUT), the module

supports the linear data format consisting of a two byte

value with a 16-bit, unsigned mantissa, and a fixed exponent

of -12. The format of the two data bytes is shown below:

The value of the number is then given by

Value = Mantissa x 2-12

For commands that set all other thresholds, voltages or

report such quantities, the module supports the linear data

format consisting of a two byte value with an 11-bit, two’s

complement mantissa and a 5-bit, two’s complement

exponent. The format of the two data bytes is shown below:

The value is of the number is then given by

Value = Mantissa x 2 Exponent

PMBus Enabled On/Off

The module can also be turned on and off via the PMBus

interface. The OPERATION command is used to actually turn

the module on and off via the PMBus, while the

ON_OFF_CONFIG command configures the combination of

analog ON/OFF pin input and PMBus commands needed to

turn the module on and off. Bit [7] in the OPERATION

command data byte enables the module, with the following

functions:

0 : Output is disabled

1 : Output is enabled

This module uses the lower five bits of the ON_OFF_CONFIG

data byte to set various ON/OFF options as follows:

Bit Position 4 3 2 1 0

Access r r/w r r r

Function PU CMD CPR POL CPA

Default Value 1 1 1 1 1

PU: Factory set to 1. QBDW033A0B requires On/Off(i) pin to

be connected to proper input rail for module to power up.

This bit is used together with the CMD, CPR and ON bits to

determine startup.

Bit Value

Action

Module does not power up until commanded

by the analog ON/OFF pin and the OPERATION

command as programmed in bits [2:0] of the

ON_OFF_CONFIG register.

CMD: The CMD bit controls how the device responds to the

OPERATION command.

Bit Value

Action

0 Module ignores the ON bit in the OPERATION

command

1 Module responds to the ON bit in the

OPERATION command

CPR: Factory set to 1. QBDW033A0B requires On/Off(i) pin to

be connected to proper input rail for module to power up.

This bit is used together with the CMD and ON bits to

determine startup.

Bit Value

Action

1 Module requires the analog ON/OFF pin to be

asserted to start the unit

PMBus Adjustable Input Undervoltage Lockout

The module allows adjustment of the input under voltage

lockout and hysteresis. The command VIN_ON allows setting

the input voltage turn on threshold, while the VIN_OFF

command sets the input voltage turn off threshold. For both

the VIN_ON and VIN_OFF commands, possible values range

from 32.000 to 46.000V in 0.125V steps. VIN_ON must be

2.000V greater than VIN_OFF.

Both the VIN_ON and VIN_OFF commands use the “Linear”

format with two data bytes. The upper five bits [7:3] of the

high data byte form the two’s complement representation of

the exponent, which is fixed at –3 (decimal). The remaining 11

bits are used for two’s complement representation of the

mantissa, with the 11th bit fixed at zero since only positive

numbers are valid. The data associated with VIN_ON and

VIN_OFF can be stored to non-volatile memory using the

STORE_DEFAULT_ALL command.

PMBus Adjustable Soft Start Delay and Rise Time

The soft start delay and rise time can be adjusted in the

module via PMBus. The TON_DELAY command sets the delay

time in ms, and allows choosing delay times between 10ms

and 500ms, with resolution of 0.5ms. The TON_RISE

command sets the rise time in ms, and allows choosing soft

start times between 15ms and 500ms, with resolution of

0.5ms. When setting TON_RISE, make sure that the charging

current for output capacitors can be delivered by the module

in addition to any load current to avoid nuisance tripping of

the overcurrent protection circuitry during startup. Both the

TON_RISE and TON_DELAY commands use the “Linear”

format with two data bytes. The upper five bits [7:3] of the

high data byte form the two’s complement representation of

the exponent, which is fixed at –1 (decimal). The remaining 11

bits are used for two’s complement representation of the

mantissa, with the 11th bit fixed at zero since only positive

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

numbers are valid. The data associated with TON_RISE and

TON_DELAY can be stored to non-volatile memory using the

STORE_DEFAULT_ALL command.

Output Voltage Adjustment Using the PMBus

The QBDW033A0B module output voltage set point is

adjusted using the VOUT_COMMAND. The output voltage

setting uses the Linear data format, with the 16 bits of the

VOUT_COMMAND formatted as an unsigned mantissa, and a

fixed exponent of -12 (decimal) (read from VOUT_MODE).

VOUT = Mantissa x 2-12

The range limits for VOUT_COMMAND are 8.10V to 13.20V,

and the resolution is 0.244mV.

The data associated with VOUT_COMMAND can be stored to

non-volatile memory using the STORE_DEFAULT_ALL

command.

Output Voltage Margining Using the PMBus

The QBDW033A0B module can also have its output voltage

margined via PMBus commands. The command

VOUT_MARGIN_HIGH sets the margin high voltage, while the

command VOUT_MARGIN_LOW sets the margin low voltage.

Both the VOUT_MARGIN_HIGH and VOUT_MARGIN_LOW

commands use the “Linear” mode with the exponent fixed at

–12 (decimal). The data associated with VOUT_MARGIN_HIGH

and VOUT_MARGIN_LOW can be stored to non-volatile

memory using the STORE_DEFAULT_ALL command.

The module is commanded to go to the margined high or low

voltages using the OPERATION command. Bits [5:2] are used

to enable margining as follows:

00XX : Margin Off

0110 : Margin Low (Act on Fault)

1010 : Margin High (Act on Fault)

Measuring Output Voltage Using the PMBus

The module can provide output voltage information using the

READ_VOUT command. The command returns two bytes of

data in the linear format, with the 16 bits of the READ_VOUT

formatted as an unsigned mantissa, and a fixed exponent of

-12 (decimal).

During module manufacture, an offset correction value is

written into the non-volatile memory of the module to null

errors in the tolerance and A/D conversion of VOUT. The

command MFR_VOUT_READ_CAL_OFFSET can be used to

read the offset - two bytes consisting of a signed 16-bit

mantissa in two’s complement format, using a fixed

exponent of -12 (decimal). The resolution is 0.244mV. The

corrected Output voltage reading is then given by:

OFFSE

CALREADVOUTMFR

DAVadV OUTOUT ____

)/([)(Re 

Measuring Input Voltage Using the PMBus

The module can provide input voltage information using the

READ_VIN command. The command returns two bytes of

data in the linear format. The upper five bits [7:3] of the high

data byte form the two’s complement representation of the

exponent, which is fixed at –3 (decimal). The remaining 11

bits are used for two’s complement representation of the

mantissa, with the 11th bit fixed at zero since only positive

numbers are valid.

During module manufacture, offset and gain correction

values are written into the non-volatile memory of the

module to null errors in the tolerance and A/D conversion of

Vin. The command MFR_VIN_READ_CAL_OFFSET can be used

to read the offset - two bytes consisting of a five-bit exponent

(fixed at -3) and a 11-bit mantissa in two’s complement

format. The resolution is 125mV. The command

MFR_VIN_READ_CAL_GAIN can be used to read the gain

correction - two bytes consisting of a unsigned 16 bit

number. The resolution of this correction factor 0.000122. The

corrected input voltage reading is then given by:

OFFSETCALREADVINMFR

GAINCALREADVINMFRDAV

adV

____

)]8192/____()/([

)(Re







Measuring Output Current Using the PMBus

The module measures output current by using the output

filter inductor winding resistance as a current sense element.

The module can provide output current information using the

READ_IOUT command. The command returns two bytes of

data in the linear format. The upper five bits [7:3] of the high

data byte form the two’s complement representation of the

exponent, which is fixed at –4 (decimal). The remaining 11

bits are used for two’s complement representation of the

mantissa, with the 11th bit fixed at zero since only positive

numbers are valid. Output current readings are blanked

below 1.65A.

During module manufacture, offset and gain correction

values are written into the non-volatile memory of the

module to null errors in the tolerance and A/D conversion of

IOUT. The command MFR_IOUT_CAL_OFFSET can be used to

read the offset - two bytes consisting of a five-bit exponent

(fixed at -4) and a 11-bit mantissa in two’s complement

format. The resolution is 62.5mA. The command

MFR_IOUT_CAL_GAIN can be used to read the gain correction

- two bytes consisting of a unsigned 16 bit number. The

resolution of this correction factor 0.000122. The READ_IOUT

command provides module average output current

information. This command only supports positive current

sourced from the module. If the converter is sinking current a

reading of 0 is provided.

OFFSETCALIOUTMFR

GAINCALIOUTMFRDAI

adI

OUT

___

)]8192/___()/([

)(Re







Note that the current reading provided by the module is

corrected for temperature.

Measuring the Temperature using the PMBus

The module can provide temperature information using the

READ_TEMPERATURE_1 command. The command returns

two bytes of data in the linear format. The upper five bits [7:3]

of the high data byte form the two’s complement

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

representation of the exponent, which is fixed at –2 (decimal).

The remaining 11 bits are used for two’s complement

representation of the mantissa.

Note that the module’s temperature sensor is located close

to the module hot spot TH1 (see Thermal Considerations).and

is subjected to temperatures higher than the ambient air

temperature near the module. The temperature reading will

be highly influenced by module load and airflow conditions.

Reading the Status of the Module using the PMBus

The module supports a number of status information

commands implemented in PMBus. However, not all features

are supported in these commands. A X in the FLAG cell

indicates the bit is not supported.

STATUS_WORD : Returns two bytes of information with a

summary of the module’s fault/warning conditions.

High Byte

Bit Position Flag Default Value

15 VOUT fault 0

14 IOUT fault or warning 0

13 Input Voltage fault 0

12 X 0

11 POWER_GOOD# (is negated) 0

10 X 0

9 X 0

8 X 0

Low Byte

Bit Position Flag Default Value

7 X 0

6 OFF 0

5 VOUT Overvoltage 0

4 IOUT Overcurrent 0

3 VIN Undervoltage 0

2 Temperature 0

1 CML (Comm. Memory Fault) 0

0 X 0

STATUS_VOUT : Returns one byte of information relating to

the status of the module’s output voltage related faults.

Bit Position Flag Default Value

7 VOUT OV Fault 0

6 X 0

5 X 0

4 X 0

3 X 0

2 X 0

1 X 0

0 X 0

STATUS_IOUT : Returns one byte of information relating to the

status of the module’s output currentrelated faults.

Bit Position

Flag Default Value

7 IOUT OC Fault 0

6 X 0

5 IOUT OC Warning 0

4 X 0

3 X 0

2 X 0

1 X 0

X 0

STATUS_INPUT : Returns one byte of information relating to

the status of the module’s input voltage related faults.

Bit Position

Flag Default Value

7 VIN OV Fault 0

6 X 0

5 X 0

4 VIN UV Fault 0

3 Module Off (Low VIN) 0

2 X 0

1 X 0

0 X 0

STATUS_TEMPERATURE : Returns one byte of information

relating to the status of the module’s temperature related

faults.

Bit Position

Flag Default Value

7 OT Fault 0

6 OT Warning 0

X 0

4 X 0

3 X 0

2 X 0

1 X 0

0 X 0

STATUS_CML : Returns one byte of information relating to the

status of the module’s communication related faults.

Bit Position

Flag Default Value

7 Invalid/Unsupported

Command 0

6 Invalid/Unsupported Data 0

5 Packet Error Check Failed 0

4 X 0

3 X 0

2 X 0

1 X 0

0 X 0

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Summary of Supported PMBus Commands

This section outlines the PMBus command support for the QBDW033A0B bus converters. Each supported command is outlined in

order of increasing command codes with a quick reference table of all supported commands included at the end of the section.

Each command will have the following basic information.

Command Name [Code]

Command support

Data format

Factory default

Additional information may be provided in tabular form or other format, if necessary.

OPERATION [0x01]

Command support: On/Off Immediate and Margins (Act on Fault). Soft off with sequencing not supported and Margins (Ignore Fault)

not supported. Therefore bits 6, 3, 2, 1 and 0 set as read only at factory defaults.

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r/w r r/w r/w r r r r

Function ON/OFF Bits[5:4] Bits[3:2] N/A

Default Value 1 0 0 0 1 0 0 0

ON_OFF_CONFIG [0x02]

Command support: Bit 1 polarity will be set based upon module code [0=Negative on/off logic, 1=positive on/off logic to allow

customer system to know hardware on/off logic

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r/w r r

Function (reserved) Bit 4 pu Bit 3 cmd Bit 2 cpr Bit 1 pol Bit 0 cpa

Default Value 0 0 0 1 1 1

module

code 1

CLEAR_FAULTS [0x03]

Command support: All functionality

STORE_DEFAULT_ALL[0x11]

Command support: All functionality – Stores operating parameters to EEprom memory.

Command requires  500ms to execute. Delay any additional commands to module for sufficient time to complete execution.

RESTORE_DEFAULT_ALL[0x12]

Command support: All functionality – Restores operating parameters from EEprom memory.

Command requires  200ms to execute. Delay any additional commands to module for sufficient time to complete execution.

VOUT_MODE[0x20]

Command support: Supported. Factory default: 0x14 – indicates linear mode with exp = -12

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r

Function Mode (linear) 2’s complement exponent

Default Value 0 0 0 1 0 1 0 0

VOUT_COMMAND [0x21]

Data format: 16 bit unsigned mantissa (implied exponent per VOUT_MODE)

Factory default: 12.000V ( 12.00 / 2-12 → 49,152 = 0xC000 )

Range limits (max/min): 13.200V/8.100V

Units: volt

Command support: Supported

VOUT_CAL_OFFSET [0x23]

Range limits (max/min): +0.25/-0.25

Units: volt

Command support: read/write support, lockout per MFR_DEVICE_TYPE, functionality implemented

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

VOUT_MARGIN_HIGH [0x25]

Range limits (max/min): 13.2/8.1

Units: volt

Command support: read/write support, full functionality except “Ignore faults”.

Note: Range cross-check - value must be greater than VOUT_MARGIN_LOW value.

VOUT_MARGIN_LOW [0x26]

Range limits (max/min): 13.2/8.1

Units: volt

Command support: read/write support, full functionality except “Ignore faults”.

Note: Range cross-check - value must be less than VOUT_MARGIN_HIGH value.

VOUT_DROOP [0x28]

Factory default: 0 (No droop); 15 (Parallel operation)

Range limits (max/min): 50/0

Units: mv/A

Command support: All functionality

VIN_ON [0x35]

Range limits (max/min): 46/32

Units: volt

Command support: All functionality

Note: Special interlock checks between VIN_ON and VIN_OFF maintain a hysteresis gap of 2V minimum and do not allow the OFF

level to be higher than and ON level

VIN_OFF [0x36]

Range limits (max/min): 46/32

Units: volt

Command support: All functionality

Note: Special interlock checks between VIN_ON and VIN_OFF maintain a hysteresis gap of 2V minimum and do not allow the OFF

level to be higher than and ON level

VOUT_OV_FAULT_LIMIT [0x40]

Range limits (max/min): 15.99/10.9 (See note 2)

Units: volt

Command support: All functionality

Note:

1. Range cross- check – value must be greater than VOUT_COMMAND value.

2. The maximum OV Fault Limit equals the output set point plus 3V, up to 15.99V. This is an automatic module protection

feature that will override a user-set fault limit if the user limit is set too high.

VOUT_OV_FAULT_RESPONSE [0x41]

Command support:

‐ Response settings (bits RSP0:1) – only a setting of 10, unit shuts down and responds according to the retry settings

below, is supported.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault) and 111 unit continuously

restarts (normal startup) while fault is present until commanded off, bias power is removed or another fault condition

causes the unit to shutdown.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the VOUT_OV_FAULT_RESPONSE command are;

‐ The unit shuts down in response to a VOUT over voltage condition.

‐ The unit will continuously restart (normal startup) while the VOUT over voltage condition is present until it is

commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w r/w r/w r r r

Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0]

Default Value 1 0 1 1 1 0 0 0

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

IOUT_OC_FAULT_LIMIT [0x46]

Range limits (max/min): 60/20

Units: amp

Command support: All functionality

Note: Range cross-check – value must be greater than IOUT_OC_WARN_LIMIT value.

IOUT_OC_FAULT_RESPONSE [0x47]

Command support:

‐ Response settings (bits RSP0:1) – only settings of 11, unit shuts down and responds according to the retry settings

below, is supported.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault) and 111 unit continuously

restarts (normal startup) while fault is present until commanded off, bias power is removed or another fault condition

causes the unit to shutdown.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the IOUT_OC_FAULT_RESPONSE command are;

‐ The unit shuts down in response to an IOUT over current condition.

‐ The unit will continuously restart (normal startup) while the IOUT over current condition is present until it is

commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w r/w r/w r r r

Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0]

Default Value 1 1 1 1 1 0 0 0

IOUT_OC_WARN_LIMIT [0x4A]

Range limits (max/min): 40/10

Units: amp

Command support: read/write support, functionality complete

Note: Range cross-check – value must be less than IOUT_OC_FAULT_LIMIT value.

OT_FAULT_LIMIT [0x4F]

Range limits (max/min): 140/25

Units: degrees C.

Command support: All functionality

Note: Range cross-check – value must be greater than OT_WARN_LIMIT value.

OT_FAULT_RESPONSE [0x50]

Command support:

‐ Response settings (bits RSP0:1) – only setting of 10, unit shuts down and responds according to the retry settings

below.

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault) and 111 unit continuously

restarts (normal startup) while fault is present until commanded off, bias power is removed or another fault condition

causes the unit to shutdown.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the OT_FAULT_RESPONSE command are;

‐ The unit shuts down in response to an over-temperature condition.

‐ The unit will continuously restart (normal startup) while the over-temperature condition is present until it is

commanded off, bias power is removed or another fault condition causes the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r/w

r/w

r r

Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0]

Default Value 1 0 1 1 1 0 0 0

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

OT_WARN_LIMIT [0x51]

Range limits (max/min): 125/25

Units: degrees C.

Command support: All functionality

Note: Range cross-check – value must be less than OT_FAULT_LIMIT value.

VIN_OV_FAULT_LIMIT [0x55]

Range limits (max/min): 90/48

Units: volt

Command support: All functionality

VIN_OV_FAULT_RESPONSE [0x56]

Command support:

Response settings (bits RSP0:1) – only settings of 11 (The device’s output is disabled while the fault is present.) is supported..

‐ Retry settings (bits RS0:2) – only settings of 000 (unit does not attempt to restart on fault.

‐ Delay time setting (bits 0-2) – only DT0:2 = 0 (no delay) supported.

Default Settings: The default settings for the VIN_OV_FAULT_RESPONSE command are;

‐ The unit shuts down in response to a VIN over voltage condition.

‐ The unit will continuously prepares to restart (normal startup) while the VIN over voltage condition is present until it is

commanded off, bias power is removed, the VIN over voltage condition is removed, or another fault condition causes

the unit to shutdown.

‐ The shutdown delay is set to 0 delay cycles.

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r

Function RSP[1] RSP[0] RS[2] RS[1] RS[0] DT[2] DT[1] DT[0]

Default Value 1 1 0 0 0 0 0 0

POWER_GOOD_ON [0x5E]

Range limits (max/min): 13.2/8.1

Units: volt

Command support: full support

Note: Range cross-check – value must be greater than POWER_GOOD_OFF value by 1.6V.

POWER_GOOD_OFF [0x5F]

Range limits (max/min): 13.2/8.1

Units: volt

Command support: full support

Note: Range cross-check – value must be less than POWER_GOOD_ON value by 1.6V.

TON_DELAY [0x60]

Range limits (max/min): 500/10

Units: milliseconds

Command support: full support

TON_RISE [0x61]

Range limits (max/min): 500/15

Units: milliseconds

Command support: full support

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

STATUS_WORD [0x79]

Command support: full implementation for supported functions (note: Fans, MFR_SPECIFIC, Unknown not supported)

Format 8 bit unsigned (bit field)

Bit Position 15 14 13 12 11 10 9 8

Access r r r r r r r r

Function VOUT

I/POUT INPUT MFR_SPEC1 #PWR_

GOOD FANS1 OTHER1 UN

KNOWN1

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r

Function BUSY1 OUTPUT

_OFF

VOUT_OV

_FAULT IOUT_OC _FAULT VIN_UV

_FAULT TEMP CML

NONE OF

ABOVE1

(1) Not supported

STATUS_VOUT [0x7A]

Command support: VOUT_OV_FAULT support, all bit reset supported

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r/reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function VOUT_OV

_FAULT

VOUT_OV

_WARN1

VOUT_UV

_WARN1

VOUT_UV

_FAULT1

VOUT_

MAX

_WARN1

TON_

MAX_

FAULT1

TOFF_

MAX_

WARN1

VOUT

TRACKING

ERROR1

(1) Not supported

STATUS_IOUT [0x7B]

Command support: IOUT_OC_FAULT support, all bit reset supported

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function IOUT_OC

_FAULT

IOUT_OC _LV

_FAULT1

IOUT_OC

_WARN

IOUT_UC

_FAULT1

Current Share

Fault1

In Power

Limiting

Mode1

POUT_OP

_FAULT1

POUT_OP

_WARN1

(1) Not supported

STATUS_INPUT [0x7C]

Command support: VIN_OV_FAULT support, all bit reset supported

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function VIN_OV

_FAULT

VIN_OV

_WARN1

VIN_UV

_WARN1

VIN_UV

_FAULT

Unit Off

(low input

voltage)

IIN_OC

_FAULT1

IIN_OC

_WARN1

PIN_OP

_WARN1

(1) Not supported

STATUS_TEMPERATURE [0x7D]

Command support: OT_WARN, OT_FAULT supported, all bit reset supported

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function OT_ FAULT OT_ WARN UT_ WARN1 UT_ FAULT1 reserved reserved reserved reserved

(1) Not supported

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

STATUS_CML [0x7E]

Command support: PEC_FAULT, INVALID_DATA, INVALID_CMD supported, all bit reset supported

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r/ reset(1) r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset r/ reset

Function INVALID

CMD

INVALID

DATA PEC FAILED MEMORY

FAULT1

PROC

FAULT1 reserved COM FAULT

(other)1

Memory/

Logic fault

(other)1

(1) Not supported

READ_VIN [0x88]

Command support: full support

READ_VOUT [0x8B]

Command support: full support

READ_IOUT [0x8C]

Command support: full support

READ_TEMPERATURE_1 [0x8D]

Command support: full support

MFR_DEVICE_TYPE [0xD0]

Command support: partial support in place (Mod Name)

Format Unsigned Binary

Bit Pos. 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0

Access r/w r/w r/w r/w r/w r r r r/w r/w r/w r/w r/w r/w r/w r/w

Function Reserved Module Name WPE Res

Default 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0

Byte Bit Description Value

Meaning

High Byte

7:0 Reserved

Low Byte

7:2 Module Name1 1xxxxx Module Name

1 WPE 0 Write Protect Enable not active.

1 Write Protect Enable active.

0 Reserved 0

Reserved

1. Present module designations (Non-isolated units will have a 0XXXXX format)

a. QBDW033A0B4xxx: 100000

b. QBDW025A0B4xxx: 100001

c. EBDW025A0B4xxx: 100010

d. EBDW020A0B4xxx: 100011

MFR_VOUT_READ_CAL_GAIN [0xD1]

Factory default: 0x2000

Range limits (max/min): 0x2666/0x1999

Units: N/A

Command support: support for VOUT gain calibration (factor in flash), lockout per MFR_DEVICE_TYPE

MFR_VOUT_READ_CAL_OFFSET [0xD2]

Range limits (max/min): exp must = -12

Units: N/A

Command support: support for VOUT offset calibration (factor in flash), lockout per MFR_DEVICE_TYPE

MFR_VIN_READ_CAL_GAIN [0xD3]

Factory default: 0X2000

Range limits (max/min): 0x2666/0x1999

Command support: support for VIN gain calibration (factor in flash), lockout per MFR_DEVICE_TYPE

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

MFR_VIN_READ_CAL_OFFSET [0xD4]

Data format: VIN linear format

Range limits (max/min): exp must = -3

Units: N/A

Command support: support for VIN offset calibration (factor in flash), lockout per MFR_DEVICE_TYPE

MFR_IOUT_CAL_GAIN [0xD6]

Range limits (max/min): 0x2666/0x1999

Units: N/A

Command support: support for IOUT gain calibration, lockout per MFR_DEVICE_TYPE

MFR_IOUT_CAL_OFFSET [0xD7]

Range limits (max/min): exp must = -4

Units: N/A

Command support: support for IOUT offset calibration, lockout per MFR_DEVICE_TYPE

MFR_FW_REV [0xDB]

Range limits (max/min): 0 - 0xff (0.00 – 15.15)

Units: N/A

Command support: full read support

MFR_C1_C2_ARA_CONFIG [0xE0]

Command Code

Command support: Full support.

Command MFR_C1_C2_ARA_CONFIG

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r/w r/w r/w r/w r/w

Function Reserved ARA Assignment Table

Default Value 0 0 0 0 0 0 0 0

Bit Description Value Meaning

7:5 Reserved 000 Reserved

4 ARA 0 ARA not functional, module remains at resistor programmed address when SMBLAERT

is asserted

1 ARA functional, module responds to ARA only, when SMBLAERT is asserted

3:0 PIN

Configuration*

0000 T/C1 pin: ON/OFF (Secondary)

C2 pin: POWER_GOOD

0001 T/C1 pin: TRIM

C2 pin: POWER_GOOD

0010 T/C1 pin: TRIM

C2 pin: ON/OFF (Secondary)

* All QBDW without –P option

Bit Description Value Meaning

7:5 Reserved 000 Reserved

4 ARA 0 ARA not functional, module remains at resistor programmed address when SMBLAERT

is asserted

1 ARA functional, module responds to ARA only, when SMBLAERT is asserted

3:0 PIN

Configuration** 0000 T/C1 pin: ON/OFF (Secondary)

C2 pin: POWER_GOOD

** All QBDW with –P option

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

MFR_ C2_LOGIC [0xE1]

Command Code

Command support: full support (bits 0 and 1) as follows:

Command MFR_C2_LOGIC

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r/ w r/ w

Function Reserved On/Off(primary & secondary) combination logic

Default Value 0 0 0 0 0 0 0 0

Bit Description Value Meaning

7:2 Reserved 000000 Reserved

1 ON/OFF

Configuration

0 Secondary side on/off pin state when mapped to either T/C1 or C2 is ignored

1 AND – Primary and Secondary side on/off

0 Secondary Side

ON/OFF Logic

0 Negative Logic (Low Enable: Input < 0.8V wrt Vout(-)

1 Positive Logic (High Enable: Input > 2.0V wrt Vout(-)

MFR_PGOOD_POLARITY [0xE2]

Command support: full support (bit 0) as follows:

Bit 0: 0 = Negative PGOOD logic (module PGOOD asserted when pin is LO, PGOOD de-asserted when pin is HI)

1 = Positive PGOOD logic (module PGOOD de-asserted when pin is LO, PGOOD asserted when pin is HI)

Command MFR_PGOOD_POLARITY

Format 8 bit unsigned (bit field)

Bit Position 7 6 5 4 3 2 1 0

Access r r r r r r r r/w

Function Reserved logic

Default Value 0 0 0 0 0 0 0 1

MFR_MODULE_DATE_LOC_SN [0xF0]

Command support: read/write support for 12 byte block, lockout per MFR_DEVICE_TYPE

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

PMBus Command Quick Reference Table

PMBUS CMD CMD

CODE

DATA

BYTES DATA FORMAT DATA

UNITS

TRANSFER

TYPE DEFAULT VALUE

OPERATION 0x01 1 Bit field N/A R/W byte 0x80

ON_OFF_CONFIG 0x02 1 Bit field N/A R/W byte 0x1D (Neg Logic)

0x1F (Pos Logic)

CLEAR_FAULTS 0x03 0 N/A N/A Send byte none

STORE_DEFAULT_ALL 0x11 0 N/A N/A Send byte none

RESTORE_DEFAULT_ALL 0x12 0 N/A N/A Send byte none

VOUT_MODE 0x20 1 mode + exp N/A Read byte 0x14

VOUT_COMMAND 0x21 2 VOUT linear Volts R/W word 12.000V

VOUT_CAL_OFFSET 0x23 2 VOUT linear Volts R/W word MS

VOUT_MARGIN_HIGH 0x25 2 VOUT linear Volts R/W word 12.600V

VOUT_MARGIN_LOW 0x26 2 VOUT linear Volts R/W word 11.400V

VOUT_DROOP 0x28 2 VOUT linear mV/A R/W word 0

VIN_ON 0x35 2 VIN linear v R/W word 35.000V

VIN_OFF 0x36 2 VIN linear v R/W word 33.000V

VOUT_OV_FAULT_LIMIT 0x40 2 VOUT linear v R/W word 15.000V

VOUT_OV_FAULT_RESPONSE 0x41 1 Bit field N/A R/W byte 0xB8

IOUT_OC_FAULT_LIMIT 0x46 2 IOUT linear Amps R/W word 40.000A

IOUT_OC_FAULT_RESPONSE 0x47 1 Bit field N/A R/W byte 0xF8

IOUT_OC_WARN_LIMIT 0x4A 2 IOUT linear Amps R/W word 36.000A

OT_FAULT_LIMIT 0x4F 2 TEMP linear Deg. C R/W word 140C

OT_FAULT_RESPONSE 0x50 1 Bit field N/A R/W byte 0xB8

OT_WARN_LIMIT 0x51 2 TEMP linear Deg. C R/W word 125C

VIN_OV_FAULT_LIMIT 0x55 2 VIN linear v R/W word 85V

VIN_OV_FAULT_RESPONSE 0x56 1 Bit field N/A R/W byte 0xC0

POWER_GOOD_ON 0x5E 2 VOUT linear v R/W word 10.100V

POWER_GOOD_OFF 0x5F 2 VOUT linear V R/W word 8.500V

TON_DELAY 0x60 2 Time linear msec R/W word 10ms

TON_RISE 0x61 2 Time linear msec R/W word 15ms

STATUS_WORD 0x79 2 Bit field N/A Read word N/A

STATUS_VOUT 0x7A 1 Bit field N/A Read byte N/A

STATUS_IOUT 0x7B 1 Bit field N/A Read byte N/A

STATUS_INPUT 0x7C 1 Bit field N/A Read byte N/A

STATUS_TEMPERATURE 0x7D 1 Bit field N/A Read byte N/A

STATUS_CML 0x7E 1 Bit field N/A Read byte N/A

READ_VIN 0x88 2 VIN linear v Read word N/A

READ_VOUT 0x8B 2 VOUT linear v Read word N/A

READ_IOUT 0x8C 2 IOUT linear Amps Read word N/A

READ_TEMP1 0x8D 2 TEMP linear Deg. C Read word N/A

PMBUS_REVISION 0x98 1 Bit Field n/a Read byte 1.2

MFR_DEVICE_TYPE 0xD0 2 Custom N/A R/W word 0x0082

MFR_VOUT_READ_CAL_GAIN 0xD1 2 16 bit unsigned N/A R/W word 0x2000

MFR_VOUT_READ_CAL_OFF 0xD2 2 VOUT linear N/A R/W word MS

MFR_VIN_READ_CAL_GAIN 0xD3 2 16 bit unsigned N/A R/W word MS

MFR_VIN_READ_CAL_OFF 0xD4 2 VIN linear N/A R/W word MS

MFR_IOUT_CAL_GAIN 0xD6 2 16 bit unsigned N/A R/W word MS

MFR_IOUT_CAL_OFFSET 0xD7 2 IOUT linear N/A R/W word MS

MFR_FW_REV 0xDB 2 8 bit unsigned N/A Read byte 0xMj.Mn.Bh.Bl

MFR_C1_C2_ARA_CONFIG 0xE0 1 Bit field N/A R/W byte 0x00

MFR_ C2_LOGIC 0xE1 1 Bit field N/A R/W byte 0x00

MFR_PGOOD _POLARITY 0xE2 1 Bit field N/A R/W byte 0x01

MFR_MOD_DATE_LOC_SN 0xF0 12 8 bit char N/A R/W block YYLLWW123456

MS=Module specific

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Mechanical Outline for QBDW033A0B Through-hole Module

Dimensions are in millimeters and [inches].

Tolerances: x.x mm  0.5 mm [x.xx in.  0.02 in.] (Unless otherwise indicated)

x.xx mm  0.25 mm [x.xxx in  0.010 in.]

TOP VIEW*

SIDE VIEW

BOTTOM VIEW

Number Pin Name

1 VIN(+)

2 ON/OFF

3 VIN(-)

4 VOUT(-)

5 SENSE(-)

6 TRIM/C1

7 SENSE(+)

8 VOUT(+)

9 C2

10 SIG

GND

11 DATA

12 SMBALERT

13 CLK

14 ADDR1

15 ADDR0

*Top side label includes GE name, product designation, and data code.

** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options.

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Mechanical Outline for QBDW033A0B–H (Baseplate version) Module

Dimensions are in millimeters and [inches].

Tolerances: x.x mm  0.5 mm [x.xx in.  0.02 in.] (Unless otherwise indicated)

x.xx mm  0.25 mm [x.xxx in  0.010 in.]

TOP VIEW

SIDE VIEW*

BOTTOM VIEW***

Number Pin Name

1 VIN(+)

2 ON/OFF

3 VIN(-)

4 VOUT(-)

5 SENSE(-)

6 TRIM/C1

7 SENSE(+)

8 VOUT(+)

9 C2

10 SIG

GND

11 DATA

12 SMBALERT

13 CLK

14 ADDR1

15 ADDR0

*Side label includes product designation, and data code.

** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options.

***Bottom label includes GE name, product designation, and data code

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

Recommended Pad Layouts

Dimensions are in millimeters and [inches].

Tolerances: x.x mm  0.5 mm [x.xx in.  0.02 in.[ (unless otherwise indicated)

x.xx mm  0.25 mm [x.xxx in  0.010 in.]

Through-Hole Modules

Number Pin Name

1 VIN(+)

2 ON/OFF

3 VIN(-)

4 VOUT(-)

5 SENSE(-)

6 TRIM/C1

7 SENSE(+)

8 VOUT(+)

9 C2

10 SIG_GND

11 DATA

12 SMBALERT

13 CLK

14 ADDR1

15 ADDR0

Hole and Pad diameter recommendations:

Pin Number Hole Dia mm [in] Pad Dia mm [in]

1, 2, 3, 5, 6, 7 1.6 [.063] 2.1 [.083]

4, 8 2.2 [.087] 3.2 [.126]

9, 10, 11, 12, 13, 14, 15 1.0 [.039] 1.5 [.059]

GE Data Sheet

QBDW033A0B Barracuda Series; DC-DC Converter Power Modules

36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output

For more information, call us at

USA/Canada:

+1 888 546 3243, or +1 972 244 9288

Asia-Pacific:

+86.021.54279977*808

Europe, Middle-East and Africa:

+49.89.878067-280

India:

+91.80.28411633

www.ge.com/powerelectronics

Ordering Information

Please contact your GE Sales Representative for pricing, availability and optional features.

Table 1. Device Codes

Product codes Input Voltage Output

Voltage

Output

Current

Efficiency Connector

Type Comcodes

QBDW033A0B41Z 48V (3675Vdc) 12V 33A 95.3% Through hole CC109159307

QBDW033A0B641Z 48V (3675Vdc) 12V 33A 95.3% Through hole CC109168885

QBDW033A0B41-HZ 48V (3675Vdc) 12V 33A 95.3% Through hole CC109163300

QBDW033A0B41-PHZ 48V (3675Vdc) 12V 33A 95.3% Through hole CC109158903

QBDW033A0B641-HZ 48V (3675Vdc) 12V 33A 95.3% Through hole CC109170172

QBDW033A0B641-PHZ 48V (3675Vdc) 12V 33A 95.3% Through hole CC109170503

Table 2. Device Options