QW075A1 - GE - Product.Network

Data Sheet

April 2008

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

Applications

nDistributed power architectures

nComputer equipment

nCommunicat ion s eq uip m en t

Options

nHeat sinks available for extended operation

nAuto-rest art after overcurrent shutdown

nCase ground pin

Features

nSmall size: 36.8 mm x 57.9 mm x 12.7 mm

(1.45 in. x 2.28 in. x 0.50 in.)

nHigh power densi ty

nHigh efficiency: 85% typical

nLow output noise

nConstant frequency

nIndustry-standar d pin o ut

nMetal baseplate

n2:1 input voltage range

nOvertemperature protection

nRemote sense

nNegative remote on/off

nAdjustable outpu t voltage

nOvervoltage and over cu rr en t protection

nManufacturing facilities registered against the

ISO*9000 series standards

nUL†1950 Recognized, CSA‡ C22.2 No. 950-95

Certified, and VDE § 0805 (EN60950, IEC950)

Licensed

nCE mark meets 73/23/EEC and 93/68/EEC direc-

tives**

* ISO is a registered trademark of the International Organization

for Standardization.

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

‡CSA is a registered trademark of Canadian Standards Associa-

tion.

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

**This product is intended for integration into end-use equipment.

All the required procedures for CE marking of end-use equip-

ment should be followed. (The CE mark is placed on selected

products.)

The QW Series Power Modules use advanced, surface-mount

technology and deliver high-quality, efficient, and compact

dc-dc conversion.

Description

The QW050B1 and QW0 75B1 Power Modu les are dc-dc converter s that oper ate over an inp ut volta ge range of

36 Vdc to 75 Vdc and provide a precisely regulated dc output. The outputs are fully isolated from the inputs,

allowing versatile polarity configurations and grounding connections. The modules have maximum power rat-

ings from 50 W to 75 W at a typical full-load efficiency of 85%.

The sealed modules offer a metal bas eplate for excellent thermal perfor mance. Threade d-throu gh holes are p ro-

vided to allow easy mounting or addition of a heat sink for high- temperature applica tions. The st andard feature se t

includes remote sensing, output trim, and remote on/off for convenient flexibility in distributed power applications.

2Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can cause pe rmanen t da mage to th e d evice. The se ar e abso-

lute 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.

Electrical Specifications

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

conditions.

Table 1. Input Specifications

Fusing Considerations

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

This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone

operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fus-

ing is not included; however, to achieve maximum safety an d system protection, always use an input line fuse. Th e

safety agencies require a normal-blow fuse with a maximum rating of 10 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 dat a for further information.

Parameter Symbol Min Max Unit

Input Voltage:

Continuous

Transient (100 ms) VI

VI, trans —

—75

100 Vdc

Operating Case Temperature

(See Thermal Considerations section.) TC–40 100 °C

Storage Temperature Tstg –55 125 °C

I/O Isolation Voltage (for 1 minute) — — 1500 Vdc

Parameter Symbol Min Typ Max Unit

Operating Input Voltage VI36 48 75 Vdc

Maximum Input Current:

VI = 0 V to 75 V; IO = IO, max; see Figures 1—2:

QW050B1

QW075B1

VI = 36 V to 75 V; IO = IO, max:

QW050B1

QW075B1

II, max

—

2.9

4.0

2.2

3.1

Inrush Transient i2t——1.5A

Input Reflected-ripple Current, Peak-to-peak

(5 Hz to 20 MHz, 12 µH source impedance;

see Figure 1 2. )

II—10—mAp-p

Input Ripple Rejection (120 Hz) — — 60 — dB

Lineage Power 3

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Electrical Specifications (continued)

Table 2. Output Specifications

* Consult your sales representative or the factory.

† These are manufacturing test limits. In some situations, results may differ.

Table 3. Isolation Specifications

Parameter Device Symbol Min Typ Max Unit

Output Voltage Set Point

(VI = 48 V; IO = IO, max; TC = 25 °C) All VO, set 11.78 12.0 12.22 Vdc

Output Voltage

(Over all operating input voltage, resistive load,

and temperature conditions until en d of life. See

Figure 14.)

All VO11.64 — 12.36 Vdc

Output Regulation:

Line (VI = 36 V to 75 V)

Load (IO = IO, min to IO, max)

Tem p erature (TC = –40 °C to +100 °C)

All

—

0.01

0.05

0.2

0.4

150

%VO

Output Ripple and Noise Voltage

(See Figure 13.):

RMS

Peak-to-peak (5 Hz to 20 MHz) All

All —

——

—75

225 mVrms

mVp-p

External Load Capacitance All — 0 — 470* µF

Output Current

(At IO < IO, min, the modules may exceed output

ripple specifications.)

QW050B1

QW075B1 IO

IO0.5

0.5 —

—4.2

6.3 A

Output Current-limit Inception

(VO = 90% of VO, nom)QW050B1

QW075B1 IO, cli

IO, cli —

—7.5

9.5 9.5†

13.5†A

Efficiency (VI = 48 V; IO = IO, max; TC = 70 °C; see

Figure 14.) QW050B1

QW075B1 η

η—

—84

85 —

—%

Switching Frequency All — — 380 — kHz

Dynamic Response

(ΔIO/Δt = 1 A/10 µs, VI = 48 V, TC = 25 °C;

tested with a 330 µF aluminum and a 1.0 µF

ceramic capacitor across the load.):

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

Peak Deviation

Settling Time (VO < 10% of peak deviation)

Load Change from I O = 50% to 25% of IO, max:

Peak Deviation

Settling Time (VO < 10% of peak deviation)

All

—

300

—

%VO, set

µs

%VO, set

µs

Parameter Min Typ Max Unit

Isolation Capa citance — 2500 — pF

Isolation Resistance 10 — — MΩ

4Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

General Specifications

Feature Specifications

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

conditions. See the Feature Descriptions section for additional information.

* These are manufacturing test limits. In some situations, results may differ.

Solder, Cleaning, and Drying Considerations

Post solder cleaning is usually the final circuit-b oard asse mbly process prio r to electrical testing. The result of inad-

equate circuit-board cleaning and drying can affect both the reliability of a power module and the testability of the

finished circuit- bo ar d assembly. For guidan ce on ap pr o pr i ate soldering, cleaning, and drying procedures, refer to

the Board-Mounted Power Modules Soldering and Cleaning Application Note (AP97-021EPS).

Parameter Min Typ Max Unit

Calculated MTBF (IO = 80% of IO, max; TC = 40 °C) 3,000,000 hours

Weight — — 75 (2.7) g (oz.)

Parameter Symbol Min Typ Max Unit

Remote On/Off Signal Interface

(VI = 0 V to 75 V; open collector or equivalent compatible;

signal referenced to VI(–) terminal):

Logic Low—Module On

Logic High—Module Off

Logic Low:

At Ion/off = 1.0 mA

At Von/off = 0.0 V

Logic High:

At Ion/off = 0.0 µA

Leakage Current

Turn-on Time (See Figure 11.)

(IO = 80% of IO, max; VO within ±1% of steady state)

Von/off

Ion/off

Von/off

Ion/off

—

0.7

1.0

µA

Output Voltage Adjustment:

Output Voltage Remote-sense Range

Output Voltage Set-point Adjustment Range (trim) —

——

60 —

—0.5

110 V

%VO, nom

Output Overvoltage Protection VO, sd 13.7* — 15.7* V

Overtemperature Protection TC—105— °C

Data Sheet

April 2008

Lineage Power 5

36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Characteristic Curves

The following figures provide typical characteristics for the power modules.

1-0092

Figure 1. Typical QW050B1 Input Characterist ics at

Room Temperature

8-3437 (F)

Figure 2. Typical QW075B1 Input Characterist ics at

Room Temperature

8-3438 (F)

Figure 3. Typical QW050B1 Efficiency vs. Output

Current at Room Temperature

1-0093

Figure 4. Typical QW075B1 Efficiency vs. Output

Current at Room Temperature

2.5

2.0

1.5

1.0

0.5

020 25 30 35 40 45 50 55 60 65 70 7

INPUT CURRENT, II (A)

INPUT V OLTAGE, VI (V)

IO = 4.17 A

IO = 2.00 A

IO = 0.50 A

INPUT VOLTAGE, VI (V)

INPUT CURRENT, II (A)

2.0

1.5

1.0

0.5

025 30 35 40 45 50 55 60 65 70 75

3.5

2.5

3.0 IO = 6.25 A

IO = 3.50 A

IO = 0.60 A

0.5

OUTPUT CURRENT, IO (A)

EFFICIENCY, η (%)

1.1 1.7 2.3 2.9 3.5 4.1

VI = 75 V

VI = 48 V

VI = 36 V

0.6 1.6 2.6 3.6 4.6 5.6

EFFICIENCY, η (%)

OUTPUT CURRENT, IO (A)

VI = 36 V

VI = 48 V

VI = 75 V

6 Lineage Power

Data Sheet

April 2008

36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Characteristic Curves (continued)

1-0095

Note: See Figure 12 for test conditions.

Figure 5. Typical QW050B1 Output Ripple Voltage

at Room Temperature and IO = IO, max

1-0015

Note: See Figure 12 for test conditions.

Figure 6. Typical QW075B1 Output Ripple Voltage

at Room Temperature and IO = IO, max

8-3442 (F)

Note: Tested with a 330 µF aluminum and a 1.0 µF ceramic capacitor

across the load.

Figure 7. Typical QW050B1 Transient Response to

Step Decrease in Load from 50% to 25%

of Full Load at Room Temperature and

48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

1-0094

Note: Tested with a 330 µF aluminum and a 1.0 µF ceramic capacitor

across the load.

Figure 8. Typical QW075B1 Transient Response to

Step Decrease in Load from 50% to 25%

of Full Load at Room Temperature and

48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

TIME, t (1 µs/div)

OUTPUT VOLTAGE, VO (V)

(100 mV/div)

VI = 36 V

VI = 48 V

VI = 75 V

OUTPUT VOLTAGE, VO (V)

(100 mV/div)

TIME, t (1 µs/div)

VI = 36 V

VI = 48 V

VI = 75 V

OUTPUT VOLTAGE, VO (V)

(200 mV/div)

TIME, t (100 µs/div)

OUTPUT CURRENT, IO (A)

(1 A/div)

2.1 A

1.1 A

OUTPUT CURRENT, I

(A)

(2 A/div)

OUTPUT VOLTAGE, V

(V)

(200 mV/div)

TIME, t (100 µs/div)

3.125 A

1.6 A

Lineage Power 7

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Characteristic Curves (continued)

8-3444 (F)

Note: Tested with a 330 µF aluminum and a 1.0 µF ceramic capacitor

across the load.

Figure 9. Typical QW050B1 Transient Response to

Step In crease in Load from 50% to 75% of

Full Load at Room Temperature and

48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

8-3445 (F)

Note: Tested with a 330 µF aluminum and a 1.0 µF ceramic capacitor

across the load.

Figure 10. T ypical QW075B1 T ransient Response to

Step Increase in Load from 50% to 75%

of Full Load at Room Temperature and

48 Vdc Input (Waveform Averaged to

Eliminate Ripple Component.)

1-0040

Figure 11. QW075B1 Typical Start-Up from Remote

On/Off; I O = Full Load

OUTPUT VOLTAGE, VO (V)

(200 mV/div)

TIME, t (100 μs/div)

OUTPUT CURRENT, IO (A)

(1 A/div)

2.1 A

3.1 A

OUTPUT VOLTAGE, VO (V)

(200 mV/div)

TIME, t (100 μs/div)

OUTPUT CURRENT, IO (A)

(2 A/div)

3.125 A

4.68 A

REMOTE ON/OFF,

ON/OFF

(V)

OUTPUT V OLTAGE, V

(V)

(5 V/div)

TIME, t (2 ms/div)

88 Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Test Configurations

8-203 (F).l

Note: Measure input reflected-ripple current with a simulated source

inductance (LTEST) of 12 µH. Capacitor CS offsets possible bat-

tery impedance. Measure current as shown above.

Figure 12. Input Re flected-Ripple Test Setup

8-513 (F).d

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

talum 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 13. Peak-to-Peak Output Noise

Measurement Test Setup

8-749 (F)

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 14. Output Voltage and Efficiency

Measurement Test Setup

Design Considerations

Input Source Impedance

The power module should be connected to a low

ac-impedance input source. Highly inductive source

impedances can affect the stability of the power mod-

ule. For the test configuration in Figure 12, a 33 µF

electrolytic capacitor (ESR < 0.7 Ω at 100 kHz)

mounted close to the power module helps ensure sta-

bility of the unit. For other highly inductive source

impedances, 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 co mpliance with the spacing and sep aration

requirements of the end-use safety agency standard,

i.e., UL1950, CSA C22.2 No. 950-95, and VDE 0805

(EN60950, IEC950).

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

voltage greater than 60 Vdc and less than or equal to

75 Vdc), for the module’s output to be considered

meeting the re qu ire m en ts of safety ex tra -lo w vo ltage

(SELV), all of the following must be true:

nThe input source is to be provided with reinforced

insulation from any hazardous voltages, including the

ac mains.

nOne VI pin and one VO pin is to be grou nded, or both

the input and output pins are to be kept floating.

nThe input pins of the module are not operator acces-

sible.

nAnother SELV reliability test is conducted on the

whole system, as required by the safety agencies, on

the combination of supply source and the subject

module 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 groundin g one of the output pins.

This may allows a non-SELV voltage to appear

between the output pin and ground.

The power module has e xtra-low voltag e (ELV) outputs

when all inputs are ELV.

The input to these units is to be provided with a maxi-

mum 10 A normal-blow fuse in the ungrounded lead.

TO OSCILLOSCOPE

CURRENT

PROBE

BATTERY

TEST

220

ESR < 0.1

@ 20

C, 100 kHz 33

ESR < 0.7

@ 100 kHz

(+)

(–)

1.0

FRESISTIVE

SCOPE

COPPER STRIP

FLOAD

(+)

(–)

VI(+)

IIIO

SUPPLY

CONTACT

CONTACT AND

LOAD

SENSE(+)

VI(–)

VO(+)

VO(–)

SENSE(–)

RESISTANCE

DISTRIBUTION LOSSES

ηVO(+) – VO(–)[]IO

VI(+) – VI(–)[]II

------------------------------------------------

⎝⎠

⎛⎞

x100=%

Lineage Power 9

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Feature Descriptions

Overcurrent Protection

To provide protection in a fault (output overload) condi-

tion, the unit is equipped with internal current-limiting

circuitry and can endure current limiting for up to one

second. If overcurren t exists for more than one second,

the unit will shut down.

At the point of current-limit inception, the unit shifts

from voltage control to current co ntrol. If the output vo lt-

age is pulled very low during a sever e fault, the current-

limit circuit can exhibit either foldback or tailout charac-

teristics (output current decrease or increase).

The module is available in two overcurrent configura-

tions. In one configuration, when the unit shuts down it

will latch off. The overcurrent latch is reset by either

cycling the input power or by toggling the ON/OFF pin

for one second. In the other configuration, the unit will

try to restart after shutdown. If the output overload con-

dition still exists when the unit rest arts, it will shut down

again. This operation will continue indefinitely until the

overcurren t con d i tion is corrected.

Remote On/Off

Negative logic remote on/off turns the module off dur-

ing a logic high and on during a logic low. To turn the

power module on and off, the user must supply a

switch to control the voltage between the on/off termi-

nal and the VI(–) terminal (Von/off). The switch can be an

open collector or equivalent (see Figure 15). A logic

low is V on/off = 0 V to 0.7 V. The maximum I on/off dur ing a

logic low is 1 mA. The switch should maintain a logic-

low voltage while sinking 1 mA.

During a logic high, the maximum Von/off generated by

the power module is 15 V. The maximum allowable

leakage current of the switch at Von/off = 15 V is 50 µA.

If not using the remote on/off feature, short the ON/OFF

pin to VI(–).

8-720 (F).c

Figure 15. Remote On/Off Implementation

Remote Sense

Remote sense minimizes the effects of distribution

losses by regulating the voltage at the remote-sense

connections. The voltage between the remote-sense

pins and the output terminals must not exceed the out-

put volt age se nse r ange given in the Fea ture Specifica-

tions table, i.e.:

[VO(+) – VO(–)] – [SENSE(+) – SENSE(–)] ≤ 0.5 V

The voltage between the VO(+) and VO(–) terminals

must not exceed the minimum output overvoltage pro -

tection value shown in the Feature Sp ecifications table.

This limit includes any increase in voltage due to

remote-sense compensation and output voltage set-

point adjustment (trim). See Figure 16.

If not using the remote-sense feature to regulate the

output at the point of load, then connect SENSE(+) to

VO(+) and SENSE(–) to VO(–) at the module.

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. Consult the factory if you

need to increase the output voltage more than the

above limitatio n.

The amount of power delivered by the module is

defined as the voltage at the output terminals multiplied

by the output curr ent. 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.

8-651 (F).m

Figure 16. Effective Circuit Configuration for

Single-Module Remote-Sense Operation

SENSE(+)

(+)

SENSE(–)

(–)

–

on/off

ON/OFF

(+)

LOAD

on/off

SENSE(+)

SENSE(–)

VI(+)

VI(–)

IOLOAD

CONTACT AND

SUPPLY II

CONTACT

VO(+)

VO(–)

DISTRIBUTION LOSSESRESISTANCE

1010 Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Feature Descriptions (continued)

Output Voltage Set-Point Adjustment

(Trim)

Output voltage trim allows the user to increase or

decrease the output volt age set point of a module. This

is accomplished by connecting an external resistor

between the TRIM pin and either th e SENSE( +) or

SENSE(–) pins. The trim resistor should be positioned

close to the module.

If not using the trim feature, leave the TRIM pin open.

With an external resistor between the TRIM and

SENSE(–) pins (Radj-down), the output volta ge set point

(VO, adj) decr eases (see Figure 1 7). The following equa-

tion determines the required external-re sistor value to

obtain a percentage output voltage change of Δ%.

With an external resistor connected betwe en the TRIM

and SENSE(+) pins (Radj-up), the output voltage set

point (VO, adj) increases (see Figure 18).

The following equation determines the required exter-

nal-resistor value to obt ain a percentage output volta ge

change of Δ%.

The voltage between the VO(+) and VO(–) terminals

must not exceed the minimum output overvoltage pro-

tection value shown in the Feature S pecifications table.

This limit includes any increase in voltage due to

remote-sense co mpensation and output voltage set-

point adjustment (trim). See Figure 16.

Although the output voltage can be increased by both

the remote sense and by the trim, the maximum

increase for th e output voltage is not the sum of both.

The maximum increase is the larger of either the

remote sense or the trim. Consult the factory if you

need to increase the output voltage more than the

above limitation.

The amount of powe r delivered by the module is

defined as the volta ge 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 outpu t of the mo dule. Care should

be taken to ensure that the maximum output pow er of

the module remains at or below the maximum rated

power.

8-748 (F).b

Figure 17. Circuit Configuration to Decrease

Output Voltage

8-715 (F).b

Figure 18. Circuit Configuration to Increase

Output Voltage

Output Overvoltage Protection

The output overvoltage protection consists of circuitry

that monitors the volt age on the output terminals. If the

voltage on the output terminals exceeds the overvolt-

age protection threshold, then the module will shut

down and latch off. The overvoltage latch is reset by

either cycling the input power for one second or by tog-

gling the on/off signal for one second.

Overtemperature Protection

These modules feature an overtemperature protection

circuit to safeguard against thermal damage. Th e cir-

cuit shuts down and latches off the module when the

maximum case temperature is exceeded. The module

can be restarted by cycling the dc input power for at

least one second or by toggling the primary or second-

ary referenced remote on/of f signal for at least one sec-

ond.

Radj-down 510

Δ%

----------10.2–

⎝⎠

⎛⎞

kΩ=

Radj-up 5.1VO100 Δ%+()

1.225Δ%

-----------------------------------------------510

Δ%

----------

–10.2–

⎝⎠

⎛⎞

kΩ=

(+)

VI(–)

ON/OFF

CASE

VO(+)

VO(–)

SENSE(+)

TRIM

SENSE(–) Radj-down RLOAD

(+)

VI(–)

ON/OFF

CASE

VO(+)

VO(–)

SENSE(+)

TRIM

SENSE(–)

Radj-up RLOAD

Lineage Power 11

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Thermal Considerations

Introduction

The power modules operate in a variety of thermal

environments; however, sufficient cooling should be

provided to help ensure reliable operation of the unit.

Heat-dissipating components inside the unit are ther-

mally coupled to the case. Heat is removed by conduc-

tion, convection, and r adiation to the surrounding

environment. Proper cooling can be verified by mea-

suring the case temperature. Peak temperature (TC)

occurs at the position indicated in Figure 19.

8-2104 (F)

Note: Top view, pin locations are for reference only.

Measurements shown in millimeters and (inches).

Figure 19. Case Temperature Measurement

Location

The temperature at this location should not exceed

100 °C. The output power of the module should not

exceed the rated power for the module as listed in the

Ordering Information table.

Although the maximum case temperature of the power

modules is 100 °C, you can limit this temperature to a

lower value for extremely high reliability.

Heat Transfer Without Heat Sinks

Increasing airflow over the module e nhances the heat

transfer via convection. Figure 22 shows the maximum

power that can be dissipated by the module without

exceeding the maximum case temperature versus local

ambient temperature (TA) for natural convection

through 3 m/s (600 ft./min.).

Note that the natural convection condition was mea-

sured at 0.05 m/s to 0.1 m/s (10 ft./min. to 20 ft./min.);

however, systems in which these power mod ules ma y

be used typically generate natural convection airflow

rates of 0.3 m/s (60 ft./min.) due to other heat-

dissipating components in the system. The use of

Figure 22 is shown in the following example.

Example

What is the minimum airflow necessary for a QW050B1

operating at VI = 48 V, an output curr ent of 3.5 A, and a

maximum ambient temperature of 40 °C?

Solution

Given: VI = 48 V

IO = 3.5 A

TA = 40 °C

Determine PD (Use Figure 20.):

PD = 8 W

Determine airflow (v) (Use Figure 22. ):

v = 1.0 m/s (200 ft./min.)

8-3447 (F)

Figure 20. QW050B1 Power Dissipation vs.

Output Current at 25 °C

8-3448 (F)

Figure 21. QW075B1 Power Dissipation vs.

Output Current at 25 °C

ON/OFF TRIM

(+)SENSE

(–)SENSE

33 (1.30)

(0.55) VI (+)

VI (–) VO (–)

VO (+)

0.5

OUTPUT CURRENT, I

(A)

POWER DISSIPATION, P

(W)

1.1 1.7 2.3 2.9 3.5 4.1

= 75 V

= 48 V

= 36 V

0.6

OUTPUT CURRENT, IO (A)

POWER DISSIPATION, PD (W)

1.6 2.6 3.6 4.6 5.6 6.6

VI = 75 V

VI = 48 V

VI = 36 V

1212 Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Thermal Considerations (continued)

Heat Transfer Without Heat Sinks (continued)

8-2306 (F).b

Figure 22. Forced Convection Power Derating with

No Heat Sink; Either Orient ation

Heat Transfer with Heat Sinks

The power modules have through-threaded, M3 x 0.5

mounting holes, which en able heat sinks or cold plates

to attach to the module. The mounting torque must not

exceed 0.56 N-m (5 in.-lb.). For a screw attachment

from the pin side, the recommended hole size on the

customer’s PWB around the mounting holes is 0.130

± 0.005 inches. If a larger hole is used, the mounting

torque from the pin side must not exceed 0.25 N-m

(2.2 in.-lbs.).

Thermal derating with h eat sinks is expresse d by using

the overall thermal resistance of the module. Total

module thermal resistance (θca) is defined as the max-

imum case temperature rise (ΔTC, max) divided by the

module power dissipation (PD):

The location to measure case temperature (TC) is

shown in Figure 19. Case-to-ambient thermal resis-

tance vs. airflow is shown, for various heat sink config-

urations and heights, in Figure 23 and Figure 24.

Longitudinal orientation is defined as the long axis of

the module that is parallel to the airflow direction,

whereas in the transverse orientation, the long axis is

perpendicular to the airflow. These curves were

obtained by experimental testing of heat sinks, which

are offered in the produc t catalog.

8-2107 (F)

Figure 23. Case-to-Ambient The rmal Resistance

Curves; Transverse Orientation

8-2108 (F)

Figure 24. Case-to-Ambient The rmal Resistance

Curves; Longitudinal Orientation

LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

010 20 30 40 50 60 70 80 90 100

4.0 m/s (800 ft./min.)

3.5 m/s (700 ft./min.)

3.0 m/s (600 ft./min.)

2.5 m/s (500 ft./min.)

2.0 m/s (400 ft./min.)

1.5 m/s (300 ft./min.)

1.0 m/s (200 ft./min.)

0.5 m/s (100 ft./min.)

0.1 m/s (20 ft./min.)

NATURAL

CONVECTION

θca ΔTCmax,

--------------------- TCTA–()

------------------------

NAT

AIR VELOCITY, m/s (ft./min.)

CASE-TO-AMBIENT THERMAL

RESISTANCE, θca (°C/W)

CONV 0.5

(100) 1.0

(200) 1.5

(300) 2.0

(400) 2.5

(500) 3.0

(600)

NO HEAT SINK

1/4 IN. HEAT SINK

1/2 IN. HEAT SINK

1 IN. HEAT SINK

NAT

AIR VELOCITY, m/s (ft./min.)

CASE-TO-AMBIENT THERMAL

RESISTANCE, θca (°C/W)

CONV 0.5

(100) 1.0

(200) 1.5

(300) 2.0

(400) 2.5

(500) 3.0

(600)

NO HEAT SINK

1/4 IN. HEAT SINK

1/2 IN. HEAT SINK

1 IN/ HEAT SINK

Lineage Power 13

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Thermal Considerations (continued)

Heat Transfer with Heat Sinks (continued)

8-2380 (F)

Figure 25. Heat Sink Power Derating Curves;

Natural Convection; Transverse

Orientation

8-2381 (F)

Figure 26. Heat Sink Power Derating Curves;

Natural Convection; Longitudinal

Orientation

8-2382 (F)

Figure 27. Heat Sink Power Derat ing Curves;

1.0 m/s (200 lfm); Transverse Orientation

8-2383 (F)

Figure 28. Heat Sink Power Derat ing Curves;

1.0 m/s (200 lfm); Longitudinal

Orientation

LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

10 20 30 40 50 60 70 80 90 100

1 IN. HEAT SINK

1/2 IN. HEAT SINK

1/4 IN. HEAT SINK

NO HEAT SINK

LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

10 20 30 40 50 60 70 80 90 100

1 IN. HEAT SINK

1/2 IN. HEAT SINK

1/4 IN. HEAT SINK

NO HEAT SINK

LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

10 20 30 40 50 60 70 80 90 100

1/4 IN. HEAT SINK

1/2 IN. HEAT SINK

1 IN. HEAT SINK

NO HEAT SINK

LOCAL AMBIENT TEMPERATURE, TA (°C)

POWER DISSIPATION, PD (W)

10 20 30 40 50 60 70 80 90 100

1/4 IN. HEAT SINK

1/2 IN. HEAT SINK

1 IN. HEAT SINK

NO HEAT SINK

1414 Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Thermal Considerations (continued)

Heat Transfer with Heat Sinks (continued)

These measured resistances are from heat transfer

from the sides and bottom of the m odule as well as the

top side with the attached heat sink; therefore, the

case-to-ambient thermal resistances shown are gener-

ally lower than the resistance of the hea t si nk by itself.

The module us ed to colle ct th e da ta in Figure 23 and

Figure 24 had a thermal-conductive dry pad between

the case and the heat sink to minimize contact resis-

tance. The use of Figure 23 and Figure 24 are shown

in the following exam p le.

Example

If an 85 °C case temperature is desired, what is the

minimum airflow necessary? Assume the QW075B1

module is operating at VI = 75 V and an output current

of 5.5 A, transvers e or ien tation, ma xim u m am b ien t air

temperature of 40 °C, and the heat sink is 1/2 inch.

Solution

Given: VI = 75 V

IO = 5.5 A

TA = 40 °C

TC = 85 °C

Heat sink = 1/2 inch

Determine PD by using Figure 21:

PD = 16 W

Then solve the following equation:

Use Figure 23 to determine air velocity for the 1/2 inch

heat sink.

The minimum airflow necessary for this module is

1.25 m/s (250 ft./min.).

Custom Heat Sinks

A more detailed model can be used to determine the

required thermal resistance of a heat sink to provide

necessary cooling. The total module resistance can be

separated into a resist ance from case-to-sink (θcs) and

sink-to-ambient (θsa) as shown in Figure 29.

8-1304 (F).e

Figure 29. Resistance from Case-to-Sink and

Sink-to-Ambient

For a managed interface using thermal grease or foils,

a value of θcs = 0.1 °C/W to 0.3 °C/W is typical. The

solution for heat sink resistance is:

This equation assumes that all dissipated power must

be shed by the heat sink. Depending on the user-

defined application environment, a more accurate

model, including heat transfer from the sides and bot-

tom of the module, can be used. This equation pro-

vides a conservative estimate for such instances.

EMC Considerations

For assistance with designing for EMC compliance,

please refer to the FLTR100V10 Filter Module Data

Sheet (DS99-294EPS).

Layout Considerations

Copper paths must not be route d beneath the power

module mounting inserts. For additional layout guide-

lines, refer to the FLTR100V10 Filter Module Data

Sheet (DS99-294EPS).

θca TCTA–()

------------------------

θca 85 40–()

------------------------

θca 2.8 °C/W=

PDTCTSTA

θcs θsa

θsa TCTA–()

------------------------ θcs–=

Lineage Power 15

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Outline Diagram

Dimensions are in millimeters and (inches).

Tolerances: x.x mm ± 0.5 mm (x.xx in. ± 0.02 in.)

x.xx mm ± 0.25 mm (x.xxx in. ± 0.010 in.)

Top View

Side View

Bottom View

8-1769 (F).b

* Side label includes Lineage name, product designation, safety agency markings, input/output voltage and current ratings, and bar code.

57.9

(2.28)

36.8

(1.45)

1.02 (0.040) DIA

SOLDER-PLATED

BRASS, 6 PLACES

1.57 (0.062) DIA

SOLDER-PLATED

BRASS, 2 PLACES

12.7

(0.50)

4.1 (0.16) MIN, 2 PLACES

0.51

(0.020)

4.1 (0.16) MIN,

6 PLACES 3.5 (0.14) MIN

SIDE LABEL*

3.6 (0.14)

10.9

(0.43)

5.3

(0.21)

26.16

(1.030)

15.24

(0.600)

5.3

(0.21)

MOUNTING INSERTS

M3 x 0.5 THROUGH,

4 PLACES

– SENSE

TRIM

+ SENSE

ON/OFF

3.81

(0.150)

7.62

(0.300)

11.43

(0.450)

15.24

(0.600)

50.80

(2.000)

7.62

(0.300) 47.2

(1.86)

VO(+)

VO(–)

VI(–)

VI(+)

11.2

(0.44) 12.7

(0.50)

RIVETED CASE PIN (OPTIONAL)

1.09 x 0.76 (0.043 x 0.030)

16 Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Recommended Hole Pattern

Component-side footprint.

Dimensions are in millimeters and (inches).

8-1769 (F).b

Ordering Information

Please contact your Lineage Power Account Manager or Field Application Engineer for pricing and availability.

Table 4. Device Codes

Optional features can be ordered using the suffixes shown in Table 5. To order more than one option, list device

codes suffixes in numerically descending order. For example, the device code for a QW050B1 module with the fol-

lowing option is shown below:

Auto-restart after overcurrent shutdown QW050B41

Table 5. Device Options

Input

Voltage Output

Power Output

Current Remote On/Off

Logic Device

Code Comcode

48 Vdc 12 Vdc 50 W 4.17 A Negative QW050B1 108446949

48 Vdc 12 Vdc 75 W 6.25 A Negative QW075B1 108446956

Option Device Code

Suffix

Case ground pin 7

Auto-restart after overcurrent shutdown 4

3.6

(0.14)

10.9

(0.43)

26.16

(1.030)15.24

(0.600)

7.62

(0.300)

5.3

(0.21)

MOUNTING INSERTS

M3 x 0.5 THROUGH,

4 PLACES

– SENSE

TRIM

+ SENSE

ON/OFF

5.3

(0.21)

47.2

(1.86)

15.24

(0.600)7.62

(0.300)

11.43

(0.450)

3.81

(0.150)

VO(+)

VO(–)

VI(–)

VI(+)

CASE PIN (OPTIONAL)

11.2

(0.44) 12.7

(0.50)

50.80

(2.000)

Data Sheet

April 2008

Lineage Power 17

36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Ordering Information (continued)

Table 6. Device Accessories

Dimensions are in millimeters and (inches).

Accessory Comcode

1/4 in. transverse kit (heat sink, thermal pad, and screws) 848060992

1/4 in. longitudinal kit (heat sink, thermal pad, and screws) 848061008

1/2 in. transverse kit (heat sink, thermal pad, and screws) 848061016

1/2 in. longitudinal kit (heat sink, thermal pad, and screws) 848061024

1 in. transverse kit (heat sink, thermal pad, and screws) 848061032

1 in. longitudinal kit (heat sink, thermal pad, and screws) 848061040

8-2473 (F)

Figure 30. Longitudinal Hea t Sink

8-2472 (F)

Figure 31. Transverse Heat Sink

26.16 ± 0.13

(1.030 ± 0.005)

57.91 ± 0.38

(2.280 ± 0.015)

1/4 IN.

1/2 IN.

1 IN.

36.83 ± 0.38

(1.450 ± 0.015)

47.24 ± 0.13

(1.850 ± 0.005)

1/4 IN.

1/2 IN.

1 IN.

1818 Lineage Power

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Notes

Lineage Power 19

Data Sheet

April 2008 36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

Notes

Data Sheet

April 200836 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W

QW050B1 and QW075B1 Power Modules; dc-dc Converters:

April 2008

DS99-209EPS

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(Outsid e U.S.A .: +1-972-284-2626)

www.lineagepower.com

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