Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75V
dc
Input; 12V
dc
Output; 25A Output Current
* 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.
Document No: ds11-002 ver 1.3
PDF Name: QBVW025A0B.pdf
BARRACUDA SERIES™
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
High and flat efficiency profile – >95.5% at 12V
dc
,
40% load to 100% output
Wide Input voltage range: 36-75V
dc
Delivers up to 25A
dc
output current
Fully very tightly regulated output voltage
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
Over temperature protection
Wide operating temperature range (-40°C to 85°C)
UL* 60950-1, 2nd Ed. Recognized, CSA† C22.2
No. 60950-1-07 Certified, and VDE‡ (EN60950-1,
2nd Ed.) Licensed
CE mark to 2006/96/EC directive
§
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 and 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)
Remote Sense and Output Voltage Trim (9=option
code)
Base plate option (-H=option code)
Passive Droop Load Sharing (-P=option code)
Description
The QBVW025A0B series of dc-dc converters are a new generation of fully regulated DC/DC power modules
designed to support 12Vdc 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
QBVW025A0B series operate from an input voltage range of 36 to 75Vdc and provide up to 25A output current at
output voltages of 12V
dc
in an industry standard, DOSA compliant quarter brick. The converter incorporates digital
control, synchronous rectification technology, a fully regulated control topology, and innovative packaging
techniques to achieve efficiency exceeding 96% at 12V output. This leads to lower power dissipations such that for
many applications a heat sink is not required. Standard features include on/off control, output overcurrent and over
voltage protection, over temperature protection, input under and over voltage lockout.
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.
RoHS Compliant
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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)
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 - - 9 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 - - μF
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 11)
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 in the ungrounded input lead of the power supply (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
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 3
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point
(VIN=VIN,nom, IO=12.5A, TA =25°C) All VO, set 11.97 12.00 12.03 Vdc
Output Voltage
(Over all operating input voltage (40V to 75V), resistive
load, and temperature conditions until end of life)
All w/o -P VO 11.76 12.24 Vdc
-P Option VO 11.68 12.32 Vdc
Output Voltage (VIN=36V, TA = 25ºC) All VO 11.15 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 -P
0.2 % VO, set
Load (IO=IO, min to IO, max), Intentional Droop -P Option 0.40 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 μF
Output Current All IO 0 25 Adc
Output Current Limit Inception All IO, lim 30 Adc
Efficiency
VIN=VIN, nom, TA=25°C
IO=100% IO, max , VO= VO,set All η 96.0 %
IO=40% IO, max to 100% IO, max , VO= VO,set All η 95.5 %
Switching Frequency fsw 150 kHz
Dynamic Load Response
dIO/dt=1A/10s; Vin=Vin,nom; TA=25°C;
(Tested with a 1.0μF ceramic, a 10μF tantalum, and
470μF capacitor and across the load.)
Load Change from IO = 50% to 75% of IO,max:
Peak Deviation
Settling Time (VO <10% peak deviation)
All Vpk
ts
__
300
700
__
mVpk
s
Load Change from IO = 75% to 50% of IO,max:
Peak Deviation
Settling Time (VO <10% peak deviation)
Vpk
ts
__
__
300
700
__
mVpk
s
Isolation Specifications
Parameter Symbol Min Typ Max Unit
Isolation Capacitance Ciso 1000 pF
Isolation Resistance Riso 10 MΩ
General Specifications
Parameter Device Typ Unit
Calculated Reliability Based upon Telcordia SR-332
Issue 2: Method I, Case 1, (IO=80%IO, max, TA=40°C,
Airflow = 200 lfm), 90% confidence
MTBF All 3,598,391 Hours
FIT All 277.9 109/Hours
Weight – Open Frame 47.4 (1.67) g (oz.)
Weight – with Base plate option 66.4 (2.34) g (oz.)
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 4
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”
Logic Low = module On, Logic High = 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 μA
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 μA
Maximum voltage allowed on On/Off pin All Von/off 14.5 Vdc
Turn-On Delay and Rise Times (IO=IO, max)
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).
* Increased Tdelay due to startup for parallel modules.
All w/o “P’
option
Tdelay, Enable
with Vin 150 ms
All w/o “P”
option
Tdelay, Enable
with on/off 10 ms
All w/ “P’
option Tdelay, Enable
with Vin 180* ms
All w/ “P”
option
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 pre-bias Vo exists at startup for
parallel modules.
All w/o “P”
option Trise 15 ms
All w/ “P’
option 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 w/ ”9”
option VSense 0.5 Vdc
Output Voltage Adjustment range All w/ ”9”
option VO, set 8.1 13.2 Vdc
Output Overvoltage Protection
All w/o “9”
option VO,limit 14.5 17.0 Vdc
All w/ ”9”
option VO,limit V
O,set+2.5V VO,set+5.0V Vdc
Overtemperature Protection All Tref 140 °C
(See Feature Descriptions)
Input Undervoltage Lockout
Turn-on Threshold (Default) 33 35 36 Vdc
Turn-off Threshold (Default) 31 33 34 Vdc
Input Overvoltage Lockout
Turn-off Threshold (Default) 86 Vdc
Turn-on Threshold (Default) 76 79 Vdc
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 5
Characteristic Curves, 12Vdc Output
The following figures provide typical characteristics for the QBVW025A0B (12V, 25A) at 25ºC. The figures are identical for
either positive or negative Remote On/Off logic.
INPUT CURRENT, Ii (A)
EFFCIENCY, η (%)
INPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A)
Figure 1. Typical Input Characteristic. Figure 2. Typical Converter Efficiency Vs. Outp ut
Current.
OUTPUT VOLTAGE,
VO (V) (50mV/div)
OUTPUT CURRENT OUTPUT VOLTAGE
IO (A) (5A/div) VO (V) (200mV/div)
TIME, t (2s/div) TIME, t (500 μs/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.
OUTPUT VOLTAGE INPUT VOLTAGE
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. F igure 6. Typical Start-Up Using Remote On/Off with
Vin applied, negative logic version shown.
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 6
Characteristic Curves, 12Vdc Output (continued)
.
OUTPUT VOLTAGE, VO (V)
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)
OUTPUT CURRENT, IO (A)
Figure 9. Typical Output Voltage regulation vs. Input
Voltage for the –P Option. Figure 10. Typical Output Voltage Regulation vs.
Output Current for the –P Option.
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 7
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. Ou tpu t Vol tage and Effi ciency Test Setup.
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance source. Highly inductive source impedance
can affect the stability of the power module. For the test
configuration in Figure 11, a 100μF electrolytic capacitor,
Cin, (ESR<0.7 at 100kHz), mounted close to the power
module helps ensure the stability of the unit.
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 ungrounded
input lead.
LOAD
CONTACT AND
SUPPLY
I
I
CONTACT
V
I
(+)
V
I
(–)
V
O1
DISTRIBUTION LOSSES
RESISTANCE
I
O
V
O2
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 8
Feature Descriptions
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 continuously. If the
overcurrent condition causes the output voltage to fall
greater than 4.0V from Vo,set, 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.
A factory configured auto-restart option (with overcurrent
and overvoltage auto-restart managed as a group) is also
available. An auto-restart feature continually attempts to
restore the operation until fault condition is cleared.
Remote On/Off
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 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,
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 low is Von/off = -0.3V to
0.8V. The typical Ion/off during a logic low (Vin=48V, On/Off
Terminal=0.3V) is 147µA. The switch should maintain a
logic-low voltage while sinking 310µA. During a logic high,
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 TBDµA. 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.
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 and remain
latched off. The overvoltage latch is reset by either cycling
the input power, or by toggling the on/off pin for one
second. 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.
A factory configured auto-restart option (with overcurrent
and overvoltage auto-restart managed as a group) is also
available. An auto-restart feature continually attempts to
restore the operation until fault condition is cleared.
Overtemperature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The circuit
shuts down the module when the maximum device
reference temperature is exceeded. The module will
automatically restart once the reference temperature cools
by ~25°C.
Input Under/Over voltage 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.
Load Sharing
For higher power requirements, the QBVW025A0 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.
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.
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 9
Feature Descriptions (continued)
Remote Sense (9 Option Code)
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.
Trim, Output Voltage Adjust (9 Option Code)
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.
V
O
(+)
TRIM
V
O
(-)
R
trim-down
LOAD
QBVW033A0 R
trim-up
Figure 16. Circuit Configuration to Trim Output
Voltage.
Connecting an external resistor (Rtrim-down) between the
TRIM 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
R
Where
100% ,
,
seto
desiredseto V
VV
For example, to trim-down the output voltage of the 12V
nominal module by 20% to 9.6V, Rtrim-down is calculated
as follows:
20%
22.10
20
511
downtrim
R
kR downtrim 3.15
Connecting an external resistor (Rtrim-up) between the TRIM
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(11.5 ,seto
uptrim V
R
Where
100% ,
,
seto
setodesired
V
VV
For example, to trim-up the output voltage of the 12V
module by 5% to 12.6V, Rtrim-up is calculated is as follows:
5%
22.10
5
511
5225.1 )5100(0.1211.5
uptrim
R
8.938
uptrim
R
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
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 10
Feature Descriptions (continued)
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 (TH1 or TH2). Peak temperature occurs at the
position indicated in Figure 17 and 18. For reliable
operation this temperature should not exceed TH1=125°C
or TH2=105°C. For extremely high reliability you can limit
this temperature to a lower value.
.
Figure 17. Location of th e thermal reference
temperature TH.
Figure 18. Location of th e thermal reference
temperature TH3 for Base plate 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 THx temperature versus
local ambient temperature (TA) for air flows of, Natural
Convection, 1 m/s (200 ft./min), 2 m/s (400 ft./min).
The use of Figure 19is shown in the following example:
Example
What is the minimum airflow necessary for a
QBVW025A0B operating at VI = 48 V, an output current of
20A, and a maximum ambient temperature of 70 °C in
transverse orientation.
Solution:
Given: Vin= 48V, IO = 20A, TA = 60 °C
Determine required airflow (V) (Use Figure 19:
V = 0.5m/s (100 LFM) or greater.
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 19. Output Current Derating for the Open
Frame QBVW025A0B in the Transve rs e 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 QBVW025A0B-H in the Transverse Orientation;
Airflow Direction from Vin(+) to Vin(-); Vin = 48V.
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 11
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 23. Output Current Derating for the Base
plate QBVW025A0B-H with 1.0” heatsink in the
Transverse Orientation; Airflow Direction from
Vin(+) to Vin(-); Vin = 48V.
Layout Considerations
The QBVW025 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 module is
designed to be processed through single or dual wave
soldering machines. The pins have a RoHS-
compliant, pure tin 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.
Reflow Lead-Free Soldering
Information
The RoHS-compliant through-hole products can be
processed with following paste-through-hole Pb or
Pb-free reflow process.
Max. sustain temperature :
245C (J-STD-020C Table 4-2: Packaging
Thickness>=2.5mm / Volume > 2000mm3),
Peak temperature over 245C is not suggested due
to the potential reliability risk of components under
continuous high-temperature.
Min. sustain duration above 217C : 90 seconds
Min. sustain duration above 180C : 150 seconds
Max. heat up rate: 3C/sec
Max. cool down rate: 4C/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.
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 21. Output Current Derating for the Base
plate QBVW025A0B-H with 0.25” heatsink in the
Transverse Orientation; Airflow Direction from
Vin(+) to Vin(-); Vin = 48V.
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 22. Output Current Derating for the Base
plate QBVW025A0B-H with 0.5” heatsink in the
Transverse Orientation; Airflow Direction from
Vin(+) to Vin(-); Vin = 48V.
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 12
Reflow Lead-Free Soldering
Information (continued)
Time
Ramp up
max. 3°C/Sec
Ramp down
max. 4°C/Sec
Time Limited 90 Sec.
above 217°C
Preheat time
100-150 Sec.
Peak Temp. 240-245°C
25°C
150°C
200°C
217°C
Figure 24. Recommended linear reflow profile
using Sn/Ag/Cu solder.
MSL Rating
The QBVW025A0B 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 Lineage Power Board
Mounted Pow er Module s : Sold er in g and Clean in g
Application Note (AP01-056EPS).
If additional information is needed, please consult with
your Lineage Power representative for more details.
EMC Consid er ations
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 FLTR100V10 data sheet.
Figure 25. EMC Considerations
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 13
Mechanical Outline for QBVW025A0B 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
Pin
Number
Pin
Name
1*VIN(+)
2*ON/OFF
3*VIN(‐)
4*VOUT(‐)
5†SENSE(‐)
6†TRIM
7†SENSE(+)
8*VOUT(+)
† - Optional Pins
See Table 2
*Top side label includes Lineage Power name, product designation, and data code.
** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options.
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 14
Mechanical Outline for QBVW025A0B–H (Base plate) 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***
Pin
Number
Pin
Name
1*VIN(+)
2*ON/OFF
3*VIN(‐)
4*VOUT(‐)
5†SENSE(‐)
6†TRIM
7†SENSE(+)
8*VOUT(+)
† - Optional Pins
See Table 2
*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 Lineage Power name, product designation, and data code
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 15
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
Pin
Number
Pin
Name
1*VIN(+)
2*ON/OFF
3*VIN(‐)
4*VOUT(‐)
5†SENSE(‐)
6†TRIM
7†SENSE(+)
8*VOUT(+)
† - Optional Pins
See Table 2
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 16
Packaging Details
All versions of the QBVW025A0B are supplied as
standard in the plastic trays shown in Figure 26.
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)
Each tray contains a total of 12 power modules. The
trays are self-stacking and each shipping box for the
QBVW025A0B module contains 2 full trays plus one
empty hold-down tray giving a total number of 24 power
modules.
Open Frame Module Tray Base Plate Module Tray
Figure 26. QBVW025 Pack ag ing Tray
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
LINEAGE POWER 17
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
QBVW025A0BZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167796
QBVW025A0B1Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167383
QBVW025A0B41Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109166195
QBVW025A0B61Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167391
QBVW025A0B64Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109169875
QBVW025A0B641Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109166204
QBVW025A0B841Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109168407
QBVW025A0B964Z 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109173167
QBVW025A0B1-HZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167400
QBVW025A0B41-HZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109166798
QBVW025A0B51-HZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167417
QBVW025A0B61-HZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167821
QBVW025A0B641-HZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109166815
QBVW025A0B941-HZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole 150020599
QBVW025A0B-PHZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109170065
QBVW025A0B1-PHZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167425
QBVW025A0B41-PHZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109167433
QBVW025A0B641-PHZ 48V
(
3675Vdc
)
12V 25A 96.0% Through hole CC109173092
Data Sheet
May 16, 2012 QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Document No: ds11-002 ver 1.3
PDF Name: QBVW025A0B.pdf
Table 2. Device Options
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+1-888-LINEAGE(546-3243)
(Outside U.S.A.: +1-972-244-WATT(9288))
www.lineagepower.com
e-mail: techsupport1@lineagepower.com
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Tel: +86.021.54279977*808
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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.
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