Data Sheet
Janu ary 26, 201 1
QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc Input; 12Vdc Output; 25A Output Current
ISO is a registered trademark of the International Organization of Standards
** 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.
Document No: DS03-078 ver. 1.27
PDF Name: QBE025A0B.pdf
§ This product is intended for integration into end-use equipment. All of the required procedures of end-use equipment should be followed
.
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (non-Z versions)
Exceptionally High power density: 173 W/in3
High efficiency – 94% at 12V full load
Delivers up to 25A output current
Low output ripple and noise
Industry standard Quarter brick:
57.9 mm x 36.8 mm x 10.6 mm
(2.28 in x 1.45 in x 0.42 in)
Cost efficient open frame design
Single optimal regulated output
Intermediate input voltage range
Constant switching frequency
Positive Remote On/Off logic
Output over current/voltage protection
Overtemperature protection
Wide operating temperature range (-40°C to 85°C)
ISO* 9001 certified manufacturing facilities
Complies with and is licensed for Basic Insulation
rating per EN60950-1
UL** 60950-1 Recognised, CSA† C22.2 No. 60950-1-
03 Certified, and VDE‡ 0805 (IEC60950, 3rd Edition)
Licensed
CE mark meets 2006/95/EC directive§
Applications
Distributed power architectures
Intermediate bus voltage applications
Telecommunications equipment
Servers and storage applications
Networking equipment
Options
Negative Remote On/Off logic
Active load sharing (Parallel Operation)
Baseplate option (-H)
Auto restart after fault shutdown
Case ground pin
Description
The QBE025A0B series of dc-dc converters are an expansion of a new generation of DC/DC power modules
designed to support 12Vdc intermediate bus applications where multiple low voltages are subsequently generated
using discrete/modular point of load (POL) converters. The QBE025A0B series provide up to 25A output current in an
industry standard quarter brick, which makes it an ideal choice for small space, high current and 12V intermediate
bus voltage applications. The converter incorporates synchronous rectification technology and innovative packaging
techniques to achieve ultra high efficiency reaching 94% at 12V full load. This leads to lower power dissipation such
that for many applications a heat sink is not required.
The QBE025A0B series power modules are isolated dc-dc converters that operate over an input voltage range from
42 to 53 Vdc and provide a single regulated 12V output. 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.
This product is affected by a Permanent Injunction entered by the United States District Court for the Eastern District of
Texas, Marshall Division in Civil Action No. 2:07-cv-00497-TJW-CE (copy enclosed). As set forth in that Order, certain acts
associated with this product are prohibited. This Product is Not for Sale in, Use in, or Importation into the United States.
RoHS Compliant
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 the device reliability.
Parameter Device Symbol Min Max Unit
Input Voltage*
Continuous VIN -0.3 54 Vdc
Non- operating continuous VIN -0.3 75 Vdc
Operating Ambient Temperature All TA -40 85 °C
(See Thermal Considerations section)
Storage Temperature All Tstg -55 125 °C
I/O Isolation Voltage (100% factory Hi-Pot tested) All 1500 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 42 48 53 Vdc
Maximum Input Current IIN,max - - 8.5 Adc
(VIN=0V to 53V, IO=IO, max)
Inrush Transient All I2t - - 1 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; VIN=
48V, IO= IOmax ; see Figure 9)
All - 24 - mAp-p
Input Ripple Rejection (120Hz) All - -50 - 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 being
part of a complex 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 15 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.
Data Sheet
January 26, 2011 QBE025A0B Series Power Mod ules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point All VO, set 12 Vdc
(VIN=IN, min, IO=IO, max, TA=25°C)
Output Voltage All VO 11.4 12.6 % VO, set
(Over all operating input voltage, resistive load,
and temperature conditions until end of life)
Output Regulation
Line (VIN=VIN, min to VIN, max) All
0.2 % VO, set
Load (IO=IO, min to IO, max) All
3 % VO, set
Temperature (Tref=TA, min to TA, max) All
150 mV
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 Capacitance All CO, max 10,000 μF
Output Current All Io 0 25 Adc
Output Current Limit Inception All IO, lim 28.5 Adc
Efficiency
VIN= VIN, nom, TA=25°C All η __ 94
%
IO=IO, max , VO= VO,set
Switching Frequency All fsw 300 kHz
Dynamic Load Response
(Io/t=1A/10s; Vin=Vin,nom; TA=25°C;
Tested with a 10 μF aluminum and a 1.0 μF
tantalum capacitor across the load.)
Load Change from Io= 50% to 75% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
12V Vpk
ts
__
2
200
__
%VO, set
s
Load Change from Io= 75% to 50% of Io,max:
Peak Deviation
Settling Time (Vo<10% peak deviation)
Vpk
ts
__
__
2
200
__
%VO, set
s
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Con verters:
42 – 53Vdc input; 12Vdc Output; 25A output current
4 LINEAGE POWER
Isolation Specifications
Parameter Device Symbol Min Typ Max Unit
Isolation Capacitance Ciso 2000 pF
Isolation Resistance Riso 10 MΩ
General Specifications
Parameter Min Typ Max Unit
Calculated MTBF (IO=80% of IO, max, TA=25°C,
airflow=1m/s(200LFM)) 2,600,000 Hours
Weight 44 (1.55) g (oz.)
Data Sheet
January 26, 2011 QBE025A0B Series Power Mod ules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 5
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 ; open collector or equivalent,
Signal referenced to VIN- terminal)
Negative Logic: device code suffix “1”
Logic Low = module On, Logic High = module Off
Positive Logic: No device code suffix required
Lo
g
ic Low = module Off, Lo
g
ic Hi
g
h = module On
Logic Low Specification
Remote On/Off Current – Logic Low All Ion/off 1.2 mA
On/Off Voltage:
Logic Low All Von/off 0.0 1.2 V
Logic High – (Typ = Open Collector) All Von/off __ 5 V
Logic High maximum allowable leakage current All Ion/off 50 μA
Turn-On Delay and Rise Times
(IO=IO, max , VIN = VIN, nom, TA = 25 oC, )
Case 1: Time until VO = 10% of VO,set from application of
Vin with Remote On/Off set to On 12 Tdelay
Enable with Vin ― 15 ― msec
Case 2: Time until VO = 10% of VO,set from operation of
Remote On/Off from Off to On with Vin already applied
for at least one second.
Tdelay
Enable with
on/off
― 1.5 ― msec
Output voltage Rise time (time for Vo to rise from 10%
of Vo,set to 90% of Vo, set)
All Trise ― 1 msec
Output Overvoltage Protection (Clamp) 12V 13
15 V
Overtemperature Protection All Tref 125 °C
(See Thermal Consideration section)
Input Undervoltage Lockout
Turn-on Threshold All 39.5 42 V
Turn-off Threshold All 39 40.5 V
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
6 LINEAGE POWER
Characteristic Curves
The following figures provide typical characteristics for the QBE025A0B (12V, 25A) at 25ºC. The figures are identical
for either positive or negative Remote On/Off logic.
INPUT CURRENT, Ii (A)
0
1
2
3
4
5
6
7
8
9
38 40 42 44 46 48 50 52 54
Io=2 5 A
Io=12.5A
Io=0 A
On/Off VOLTAGE OUTPUT VOLTAGE
VON/OFF(V) (2V/div) VO (V) (5V/div)
INPUT VOLTAGE, VO (V) TIME, t (500 s/div)
Figure 1. Typical Input Characteristic at Room
Temperature Figure 4. Typical Start-Up Using Remote On/Off,
negative logic versi on show n.
EFFCIENCY, η (%)
85
86
87
88
89
90
91
92
93
94
95
0 5 10 15 20 25
Vin=42V
Vin=48V
Vin=53V
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5A/div) VO (V) (500mV/div)
OUTPUT CURRENT, IO (A) TIME, t (200 μs/div)
Figure 2. Typi cal Conv erter Effici ency Vs. Output
current at Room Temperature Figure 5. Typical Transie nt Response to Step change
in Loa d from 25% to 50 % to 25 % of Full L o ad at Room
Temperature and 48 V dc Input .
OUTPUT VOLTAGE,
VO (V) (100mV/div)
OUTPUT CURRENT, OUTPUT VOLTAGE
IO (A) (5A/div) VO (V) (500mV/div)
TIME, t (1s/div) TIME, t (200 μs/div)
Figure 3. Typical Output Ripple and Noise at Room
Temperat ure and Io = Io,max Figure 6. Typical Transient Resp onse to Step Change
in Loa d from 50% to 75 % to 50 % of Full L o ad at Room
Temperature and 48 V dc Input
53 Vin
48 Vin
42 Vin
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 7
Characteristic Curves (continued)
The following figures provide typical characteristics for the QBE025A0B (12V, 25A) at 25ºC. The figures are identical
for either positive or negative Remote On/Off logic.
OUTPUT VOLTAGE, VO (V)
11.7
11.8
11.9
12
12.1
12.2
12.3
42 44 46 48 50 52 54
Io=25AIo=12.5A
Io=0 A
INPUT VOLTAGE, Vin (V)
Figur e 7. Ty pi c al Ou tpu t volt a ge re g ul a tion vs. Inpu t
voltage at Room Temperature
OUTPUT VOLTAGE, VO (V)
11.7
11.8
11.9
12
12.1
12.2
0 5 10 15 20 25
Vin=42V
Vin=48V
Vin=53V
OUTPUT CURRENT, IO (A)
Figure 8. Typical Output voltage regulation Vs. Output
current at Room Temperature
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
8 LINEAGE POWER
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 9. Input Reflected Ripple Current Test
Setup.
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
V
O (+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 10. Output Ripple and Noise Test Setup.
VO
COM
VIN(+)
COM
RLOAD
Rcontact Rdistribution
Rcontact Rdistribution
Rcontact
Rcontact
Rdistribution
Rdistribution
VIN VO
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 11. Ou tput Voltage and Efficien cy Te s t
Setup.
=
VO. IO
VIN. IIN
x 100 %
Efficiency
Design Considerations
Input Filtering
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 9, a
100μF electrolytic capacitor (ESR<0.7 at 100kHz),
mounted close to the power module helps ensure the
stability of the unit. 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., UL 1950, CSA C22.2 No. 60950-00,
and VDE 0805:2001-12 (IEC60950 3rd 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 extra-low voltage (ELV)
outputs when all inputs are ELV. The input to these
units is to be provided with a maximum 15 A fast-
acting (or time-delay) fuse in the unearthed lead.
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 9
Feature Description
Remote On/Off
Two remote on/off 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 low.
Negative logic remote on/off turns the module off
during a logic high and on during a logic low. Negative
logic, device code suffix "1," is the factory-preferred
configuration. The on/off circuit is powered from an
internal bias supply. 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 Vi (-)
terminal (Von/off). The switch can be an open
collector or equivalent (see Figure 12). A logic low is
Von/off = 0.0V to 0.8V. The typical Ion/off during a
logic low is 10 µA. The switch should maintain a logic-
low voltage while sinking 10µA. During a logic high,
the maximum Von/off generated by the power module
is 5.0V. The maximum allowable leakage current of
the switch at Von/off = 2.0V is 6.0µA. If using an
external voltage source, the maximum voltage V
on/off on the pin is 14.0V with respect to the Vi (-)
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 VI(-).
For positive logic: leave ON/OFF pin open.
.
V
O
(+)
V
O
(–)
V
I
(–)
+
–
I
on/off
ON/OFF
V
I
(+)
LOA
D
V
on/off
Figure 12. Remote On/Off Implementation
Overcurrent Protection
To provide protection in a fault output overload
condition, the module is equipped with internal
current-limiting circuitry and can endure current
limiting for a few mili-seconds. If the overcurrent
condition persists beyond a few milliseconds, the
module will shut down and remain latched off. The
overcurrent latch is reset by either cycling the input
power or by toggling the on/off pin for one second. 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.
An auto-restart option is also available. An auto-
restart feature continually attempts to restore the
operation until fault condition is cleared.
Input Undervoltage Lockout
At input voltages above or below the input under/over
voltage lockout limits, module operation is disabled.
The module will begin to operate when the input
voltage level changes to within the under and
overvoltage lockout limits.
Overtemperature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The
circuit shuts down and latches off the module when
the maximum device reference temperature is
exceeded. The module can be restarted by cycling
the dc input power for at least one second or by
toggling the remote on/off signal for at least one
second.
Output Overvoltage Clamp
The output overvoltage clamp consists of a control
circuit, independent of the primary regulation loop,
that monitors the voltage on the output terminals and
clamps the voltage when it exceeds the overvoltage
set point. The control loop of the clamp has a higher
voltage set point than the primary loop. This provides
a redundant voltage control that reduces the risk of
output overvoltage.
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
10 LINEAGE POWER
Feature Description (continued)
Forced Load Sharing (Parallel Operation with
– P option)
For additional power requirements, the power module
can be configured for parallel operation with active
load current sharing. Good layout techniques should
be observed for noise immunity when using multiple
modules in parallel. To implement active load
sharing, the following recommendations must be
followed:
The parallel pins of all units in parallel must be
connected together. The path of these
connections should be as direct as possible, but
should not pass beneath the perimeter of the
module body, except immediately adjacent to the
parallel pin location.
Parallel modules must use the same 48V source.
The VIN (-) input pin is the return path for the
active current share signal of the parallel pin.
Separate 48V sources will prevent the active
current share return signal from being connected
to other modules.
The VIN (-) input connection should never be
disconnected from any of the parallel modules,
while another of the parallel modules is
operating, unless the VIN (+) pin, or the parallel
pin is also disconnected. The VIN (-) input
provides the internal logic ground and for the
module’s primary circuits, including the active
current share circuit; and there are sneak paths
through the module’s internal control ICs, when
the VIN (-) pin is disconnected (allowing the
internal logic circuit to float), while the parallel pin
and VIN (+) pin are connected to other operating
modules. These sneak paths do not cause
permanent damage, but do create false
conditions that can affect the module’s internal
logic configuration.
The on/off pins of all modules should also be tied
together to the same external control circuitry, so
that the modules are turned on and off at the
same time, unless all parallel modules’ on/off
pins are tied to the input pins for automatic start
upon application of input voltage.
When modules in parallel applications contain the
auto-restart (4) option, it is required that the total
maximum load current value be less than 90% of
[n-1] times the individual module output current
rating, where n is the number of modules in
parallel. For example, if the application is using
three modules rated at 25A, then the maximum
total load shall be less than 0.9 x (3-1) x 25A =
0.9 x 2 x 25A = 45A. This insures that a single
module can shutdown without causing the total
load to exceed the capability of the remaining
operating module(s). The shutdown module can
then automatically restart, and assume its share
of the total load.
In all parallel applications (including applications
meeting the [n-1] sizing criteria discussed
earlier), if it is expected that a protective
shutdown event could cause more than one
parallel module to shutdown (for example, over
temperature due to a common fan failure, or
gross over current affecting two or more modules
simultaneously), then the use of the auto-restart
(4) option is not recommended. The auto-restart
interval of these modules is not synchronized to
other modules, nor is it precise. There will not be
a successful restart following multiple module
shutdowns, because the individual module’s
restart timings will be different. There will not be
sufficient module capacity to prevent the first
module which restarts from experiencing an over
current, and then again shutting down before the
slowest module has restarted. Meanwhile, the
slowest module will then restart, and then
shutdown during the interval the fastest module is
waiting for its next restart. And so on and so on.
In these cases, only latching shutdown modules
should be used; and either toggling the Vin source
or the on/off pin to simultaneously restart the
modules, following a shutdown, is advised.
When not using the parallel feature, leave the share
pin open.
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 11
Thermal Considerations
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. The thermal data presented here is based
on physical measurements taken in a wind tunnel.
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).
Peak temperature (TH) occurs at the position
indicated in Figure 13. For reliable operation this
temperature should not exceed the listed temperature
threshold.
Figure 31. Tref Temperature measurement
location.
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 TH temperature of the power
modules is 110 °C - 115 °C, you can limit this
temperature to a lower value for extremely high
reliability.
Heat Transfer via Convection
Increased airflow over the module enhances the heat
transfer via convection. The thermal derating figures
(14-17) show the maximum output current that can be
delivered by each module in the respective orientation
without exceeding the maximum TH temperature
versus local ambient temperature (TA) for air flows of
1 m/s (200 ft./min) and 2m/s (400 ft./min).
Note that the natural convection condition was
measured at 0.05 m/s to 0.1 m/s (10ft./min. to 20
ft./min.); however, systems in which these power
modules may 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 Figures 14 - 15 are shown in the following
example:
Example
What is the minimum airflow necessary for a
QBE025A0B operating at VI = 48 V, an output current
of 12A, and a maximum ambient temperature of 70 °C
in transverse orientation.
Solution:
Given: VI = 48V, Io = 12A, TA = 70 °C
Determine required airflow (V) (Use Figure 14):
V = T1 m/sec. ( 200 ft./min.) or greater.
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figur e 14. Output Curren t Dera ti n g fo r the
QBE025A0B in the Transverse Orientation with no
baseplate; Airflow Direction from Vin(+) to Vin(-); Vin
= 48V
OUTPUT CURRENT, IO (A)
0.0
5.0
10.0
15.0
20.0
25.0
30.0
0 20 40 60 80 100
Natural Convection
1m/s
(
200LFM
)
2m/s
(
400LFM
)
3m/s
(
600LFM
)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figur e 15. Output Curren t Dera ti n g fo r the
QBE025A0B (Vo = 12V) in the Transverse
Orientation with baseplate; Airflow Direction from
Vin(+) to Vin(-); Vin = 48V
0
5
10
15
20
25
30
0 20406080100
Natural Convection
1m/s
(
200LFM
)
2m/s
(
400LFM
)
3m/s
(
600LFM
)
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
12 LINEAGE POWER
OUTPUT CURRENT, IO (A)
0.0
5.0
10.0
15.0
20.0
25.0
30.0
0 20 40 60 80 100
1m/s
(
200LFM
)
2m/s
(
400LFM
)
3m/s
(
600LFM
)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 16. Output Cu rrent Derating for the
QBE025A0B (Vo = 12V) in the Transverse Orientation
with baseplate and 0.25-inch high heatsink; Airflow
Direction from Vin(–) to Vout(--); Vin = 48V
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 17. Output Current Derating for the
QBE025A0B (Vo = 12V) in the Transverse Orientation
with baseplate and 0.5-inch high heatsink; Airflow
Direction from Vin(–) to Vout(--); Vin = 48V
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.
Layout Considerations
The QBE025 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 the
FLTR100V10 data sheet.
Through-Hole Lead-Free Soldering
Information
The RoHS-compliant through-hole products use the
SAC (Sn/Ag/Cu) Pb-free solder and RoHS-compliant
components. They are designed to be processed
through single or dual wave soldering machines. The
pins have an RoHS-compliant finish that is compatible
with both Pb and Pb-free wave soldering processes.
A maximum preheat rate of 3C/s is suggested. The
wave preheat process should be such that the
temperature of the power module board is kept below
210C. For Pb solder, the recommended pot
temperature is 260C, while the Pb-free solder pot is
270C 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 Lineage Power
representative for more details.
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 Lineage Power Board
Mounted Pow er Module s : Sold ering a nd Clean in g
Application Note (AP01-056EPS).
0.0
5.0
10.0
15.0
20.0
25.0
30.0
0 20406080100
1m/s
(
200LFM
)
2m/s
(
400LFM
)
3m/s
(
600LFM
)
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 13
Mechanical Outline for QBE025A 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
36.8
(1.45)
57.9
(2.28)
4.6
(.18) MIN
1.57 (.062) DIA SOLDER PLATED
PIN SHOULDER, 5 PLCS
1.02 (.040) DIA SOLDER PLATED
PIN, 5 PLCS
0.25
(.010)MIN 2.36 (.093) DIA SOLDER-PLATED
PIN SHOULDER, 2 PLCS
1.57 (.062) DIA SOLDER-PLATED
PIN, 2 PLCS
3.6
(.14)
7.62
(.300) 3.81
(.150)
11.43
(.450)
15.24
(.600)
VI(-)
VI(+)
ON/OFF
50.8
(2.000)
10.8
(.43)
15.24
(.600)
VO(-)
VO(+)
CASE
PARALLEL
10.5
(.41)
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
14 LINEAGE POWER
Mechanical Outline for QBE025A-H (Basep late version) 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
36.8
(1.45)
57.9
(2.28)
4.6
(.18)MIN
1.57 (.062) DIA SOLDER PLATED
PIN SHOULDER, 5 PLCS
1.02 (.040) DIA SOLDER PLATED
PIN, 5 PLCS
0.25
(.010)MIN
12.7
(0.50)
2.36 (.093) DIA SOLDER-PLATED
PIN SHOULDER, 2 PLCS
1.57 (.062) DIA SOLDER-PLATED
PIN, 2 PLCS
3.6
(.14)
7.62
(.300) 3.81
(.150)
11.43
(.450)
15.24
(.600)
VI(-)
VI(+)
ON/OFF
10.8
(.43)
15.24
(.600)
VO(-)
VO(+)
5.3
(.21)
5.3
(.21)
47.24
(1.860)
M3X 0.5 THREADED
MOUNTING HOLES
MAX SCREW TORQUE
0.56 N·M (5 IN·LB)
3.0 (0.12) MAX
SCREW PROTRUSION
50.80
(2.000)
26.16
(1.030)
CASE
PARALLEL
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
LINEAGE POWER 15
Recommended Pad Layout
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.)
50.80
(2.000)
Vo (+)
Vo (-)
15.24
(.600)
V
I
(+)
V
I
(-)
†
†
ON/OFF
3.6
(.14)
10.8
(.43)
57.9
(2.28)
36.8
(1.45)
1.02 (.040) DIA PIN, 5 PLCS
1.57 (.062) DIA PIN, 2 PLCS
CASE
Data Sheet
January 26, 2011 QBE025A0B Series Power Modules, DC - DC Converters:
42 – 53Vdc input; 12Vdc Output; 25A output current
This product is affected by a Permanent Injunction entered by the United States District
Court for the Eastern District of Texas, Marshall Division in Civil Action No. 2:07-cv-00497-
TJW-CE (copy enclosed). As set forth in that Order, certain acts associated with this product
are prohibited. This Product is Not for Sale in, Use in, or Importation into the United States.
Document No: DS03-078 ver. 1.27
PDF Name: QBE025A0B.pdf
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 1. Device Codes
Product codes Input Voltage Output
Voltage Output
Current Efficiency Connector
Type Comcodes
QBE025A0B1 48V (42-53Vdc) 12V 25A 94% Through hole 108981432
QBE025A0B1Z 48V (42-53Vdc) 12V 25A 94% Through hole CC109107868
Table 2. Device Options Option Suffix
Negative remote on/off logic 1
Auto-restart 4
Case ground pin (offered with baseplate option only) 7
Base Plate option -H
Active load sharing (Parallel Operation) -P
RoHS Compliant Z
Note: Legacy device codes may contain a –B option suffix to indicate 100% factory Hi-Pot tested to the isolation voltage specified in
the Absolute Maximum Ratings table. The 100% Hi-Pot test is now applied to all device codes, with or without the –B option suffix.
Existing comcodes for devices with the –B suffix are still valid; however, no new comcodes for devices containing the –B suffix will
be created.
World Wide Headquarters
Lineage Power Corporation
601 Shiloh Road, Plano, TX 75074, USA
+1-888-LINEAGE(546-3243)
(Outside U.S.A.: +1-972-244-WATT(9288))
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
Asia-Pacific H ead quarters
Tel: +86.021.54279977*808
Europe, Mi ddle-East and Africa He adquarters
Tel: +49.89.878067-280
India Headquarters
Tel: +91.80.28411633
Lineage Power reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or
a
pplication. No rights under any patent accompany the sale of any such product(s) or information.
Lineage Power DC-DC products are protected under various patents. Information on these patents is available at www.lineagepower.com/patents.
©
2010 Lineage Power Corporation, (Plano, Texas) All International Rights Reserved.
