VISHAY QBVW025A0B1Z

Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
BARRACUDA SERIES™
Features







RoHS Compliant
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)










Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
High and flat efficiency profile – >95.5% at 12Vdc,
40% load to 100% output
Wide Input voltage range: 36-75Vdc
Delivers up to 25Adc 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
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 12Vdc 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. Builtin filtering for both input and output minimizes the need for external filtering.
*
†
‡
§
¤
**
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
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
VIN
-0.3
75
Vdc
100
Vdc
VIN
80
100
Vdc
All
TA
-40
85
°C
All
Tstg
-55
125
°C
I/O Isolation Voltage (100% factory Hi-Pot tested)
All
2250


* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.
Vdc
Input Voltage*
Continuous
Operating transient ≤ 100mS
Non- operating continuous
Operating Ambient Temperature
(See Thermal Considerations section)
Storage Temperature
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter
Device
Operating Input Voltage
Maximum Input Current
(VIN=0V to 75V, IO=IO, max)
Input No Load Current
(VIN = VIN, nom, IO = 0, module enabled)
Input Stand-by Current
(VIN = VIN, nom, module disabled)
External Input Capacitance
Symbol
Min
Typ
Max
Unit
VIN
36
48
75
Vdc
IIN,max
-
-
9
Adc
All
IIN,No load
All
IIN,stand-by
All
2
It
80
mA
22
mA
100
-
-
μF
-
-
1
As
2
Inrush Transient
All
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
Electrical Specifications (continued)
Parameter
Device
Symbol
Min
Typ
Max
Unit
All
VO, set
11.97
12.00
12.03
Vdc
All w/o -P
VO
11.76

12.24
Vdc
-P Option
VO
11.68

12.32
Vdc
All
VO
11.15


Vdc
Output Voltage Set-point
(VIN=VIN,nom, IO=12.5A, TA =25°C)
Output Voltage
(Over all operating input voltage (40V to 75V), resistive
load, and temperature conditions until end of life)
Output Voltage (VIN=36V, TA = 25ºC)
Output Regulation[VIN, min = 40V]
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
Line (VIN= VIN, min to VIN, max)
0.40
All

RMS (5Hz to 20MHz bandwidth)
All
Peak-to-Peak (5Hz to 20MHz bandwidth)
All
Temperature (TA = -40ºC to +85ºC)
Vdc

2

70

mVrms

200

mVpk-pk
0

% VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max)
External Output Capacitance
For CO >5000uF, IO must be < 50% IO, max during Trise.
All
CO, max
10,000
μF
Output Current
All
IO
0
Output Current Limit Inception
All
IO, lim

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
%
fsw
150
kHz
30
25
Adc

Adc
Efficiency
VIN=VIN, nom, TA=25°C
Switching Frequency
Dynamic Load Response
dIO/dt=1A/10s; 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
Load Change from IO = 75% to 50% of IO,max:
Peak Deviation
Settling Time (VO <10% peak deviation)
Vpk
ts

__
300
700

__
mVpk
s
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
Typ
Unit
MTBF
All
3,598,391
Hours
FIT
All
277.9
10 /Hours
Weight – Open Frame
47.4 (1.67)
g (oz.)
Weight – with Base plate option
66.4 (2.34)
g (oz.)
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
LINEAGE POWER
Device
9
3
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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 VINterminal)
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
All w/o “P’
option
All w/o “P”
option
All w/ “P’
option
All w/ “P”
option
All w/o “P”
option
All w/ “P’
option
Tdelay Enable


150
ms
Tdelay, Enable


10
ms
Tdelay, Enable


180*
ms
Tdelay, Enable


40*
ms
Trise


15
ms
Trise


300*
ms
3
A
0.5
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 milliseconds (Enable with on/off).
* Increased Tdelay due to startup for parallel modules.
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.
Load Sharing Current Balance
(difference in output current across all modules
with outputs in parallel, no load to full load)
-P Option
All w/ ”9”
option
All w/ ”9”
option
All w/o “9”
option
All w/ ”9”
option
,
with Vin
with on/off
with Vin
with on/off
Idiff
VSense

VO, set
8.1
13.2
Vdc
VO,limit
14.5
17.0
Vdc
VO,limit
VO,set+2.5V
VO,set+5.0V
Vdc
Tref

140

°C
Turn-on Threshold (Default)
33
35
36
Vdc
Turn-off Threshold (Default)
31
33
34
Vdc
Remote Sense Range
Output Voltage Adjustment range
Output Overvoltage Protection
Overtemperature Protection
(See Feature Descriptions)
All

Input Undervoltage Lockout
Input Overvoltage Lockout
Turn-off Threshold (Default)

86

Vdc
Turn-on Threshold (Default)
76
79

Vdc
LINEAGE POWER
4
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Characteristic Curves, 12Vdc Output
EFFCIENCY, η (%)
INPUT CURRENT, Ii (A)
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 VOLTAGE, VO (V)
TIME, t (2s/div)
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
VO (V) (5V/div)
TIME, t (20 ms/div)
Figure 5. Typical Start-Up Using Vin with Remote
On/Off enabled, negative logic version shown.
LINEAGE POWER
TIME, t (500 μs/div)
On/Off VOLTAGE
VON/OFF (V)(2V/div)
OUTPUT VOLTAGE INPUT VOLTAGE
VIN(V) (20V/div)
VO (V) (5V/div)
Figure 3. Typical Output Ripple and Noise, Io = Io,max.
OUTPUT CURRENT, IO (A)
Figure 2. Typical Converter Efficiency Vs. Output
Current.
OUTPUT CURRENT OUTPUT VOLTAGE
IO (A) (5A/div)
VO (V) (200mV/div)
OUTPUT VOLTAGE,
VO (V) (50mV/div)
Figure 1. Typical Input Characteristic.
TIME, t (5 ms/div)
Figure 6. Typical Start-Up Using Remote On/Off with
Vin applied, negative logic version shown.
5
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
OUTPUT VOLTAGE, VO (V)
OUTPUT VOLTAGE, VO (V)
Characteristic Curves, 12Vdc Output (continued)
INPUT VOLTAGE, Vin (V)
OUTPUT CURRENT, IO (A)
Figure 8. Typical Output Voltage Regulation vs.
Output Current .
OUTPUT VOLTAGE, VO (V)
Figure 7. Typical Output Voltage Regulation vs. Input
Voltage.
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.
.
LINEAGE POWER
6
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Test Configurations
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
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.
CONTACT AND
DISTRIBUTION LOSSES
VI(+)
VO1
IO
II
LOAD
SUPPLY
VI(–)
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.,
nd
nd
UL60950-1 2 Ed., CSA C22.2 No. 60950-1 2 Ed., and
nd
VDE0805-1 EN60950-1 2 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.
VO2
CONTACT
RESISTANCE
Note: All measurements are taken at the module terminals. When
socketing, place Kelvin connections at module terminals to avoid
measurement errors due to socket contact resistance.
Figure 13. Output Voltage and Efficiency Test Setup.
LINEAGE POWER
7
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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
LINEAGE POWER
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.
8
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
The following equation determines the required external
resistor value to obtain a percentage output voltage change
of ∆%
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).
 511

R trim  down  
 10 . 22  
 %

V
 V desired 
  100
 %   o , set


V o , set


Where
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
 511

Rtrim  down  
 10 .22  
 20

Rtrim  down  15 .3 k 
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 ∆%:
 5 .11  Vo , set  (100   %) 511


 10 .22  
Rtrim  up  
1 .225   %
%


V
 V o , set
 %   desired
V
o
,
set

Where

  100


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
Figure 15. Circuit Configuration for remote sense.
R trim  up
 5 . 11  12 . 0  (100  5 ) 511



 10 . 22  
1 . 225  5
5


Rtrim  up  938 .8
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.
VO(+)
Rtrim-up
QBVW033A0
LOAD
TRIM
Rtrim-down
VO(-)
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%.
LINEAGE POWER
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).
9
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Feature Descriptions (continued)
Heat Transfer via Convection
Thermal Considerations
Increased airflow over the module enhances the heat
transfer via convection. The thermal derating of figure 1923 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)
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 18. Location of the 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.
LINEAGE POWER
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 19. Output Current Derating for the Open
Frame QBVW025A0B in the Transverse Orientation;
Airflow Direction from Vin(+) to Vin(-); Vin = 48V.
OUTPUT CURRENT, IO (A)
.
Figure 17. Location of the thermal reference
temperature TH.
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.
10
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
OUTPUT CURRENT, IO (A)
Layout Considerations
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.
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.
LINEAGE POWER
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 RoHScompliant, pure tin finish that is compatible with both
Pb and Pb-free wave soldering processes. A
maximum preheat rate of 3C/s is suggested. The
wave preheat process should be such that the
temperature of the power module board is kept below
210C. For Pb solder, the recommended pot
temperature is 260C, while the Pb-free solder pot is
270C max.
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 :
245C (J-STD-020C Table 4-2: Packaging
3
Thickness>=2.5mm / Volume > 2000mm ),
Peak temperature over 245C is not suggested due
to the potential reliability risk of components under
continuous high-temperature.
Min. sustain duration above 217C : 90 seconds
Min. sustain duration above 180C : 150 seconds
Max. heat up rate: 3C/sec
Max. cool down rate: 4C/sec
In compliance with JEDEC J-STD-020C spec for 2
times reflow requirement.
Pb-free Reflow Profile
BMP module will comply with J-STD-020 Rev. C
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for
both Pb-free solder profiles and MSL classification
procedures. BMP will comply with JEDEC J-STD020C 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.
11
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Reflow Lead-Free Soldering
Information (continued)
Peak Temp. 240-245°C
Ramp down
max. 4°C/Sec
217°C
200°C
Time Limited 90 Sec.
above 217°C
150°C
Preheat time
100-150 Sec.
Ramp up
max. 3°C/Sec
25°C
Time
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 Power Modules: Soldering and Cleaning
Application Note (AP01-056EPS).
If additional information is needed, please consult with
your Lineage Power representative for more details.
EMC Considerations
The circuit and plots in Figure 25 shows a suggested configuration to meet the conducted emission limits of EN55022
Class A. For further information on designing for EMC compliance, please refer to the FLTR100V10 data sheet.
Figure 25. EMC Considerations
LINEAGE POWER
12
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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 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.
TOP VIEW*
SIDE VIEW
BOTTOM VIEW
Pin Pin Number Name 1* VIN(+) 2* ON/OFF 3* VIN(‐) 4* VOUT(‐) 5† SENSE(‐) 6† TRIM 7† SENSE(+) 8* VOUT(+) † - Optional Pins
See Table 2
LINEAGE POWER
13
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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.]
*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
TOP VIEW
SIDE VIEW*
BOTTOM VIEW***
Pin Pin Number Name 1* VIN(+) 2* ON/OFF 3* VIN(‐) 4* VOUT(‐) 5† SENSE(‐) 6† TRIM 7† SENSE(+) 8* VOUT(+) † - Optional Pins
See Table 2
LINEAGE POWER
14
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
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 Pin Number Name 1* VIN(+) 2* ON/OFF 3* VIN(‐) 4* VOUT(‐) 5† SENSE(‐) 6† TRIM 7† SENSE(+) 8* VOUT(+) † - Optional Pins
See Table 2
LINEAGE POWER
15
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Packaging Details
All versions of the QBVW025A0B are supplied as
standard in the plastic trays shown in Figure 26.
Tray Specification
Material
Max surface resistivity
Color
Capacity
Min order quantity
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.
PET (1mm)
9
11
10 -10 /PET
Clear
12 power modules
24 pcs (1 box of 2 full
trays + 1 empty top tray)
Open Frame Module Tray
Base Plate Module Tray
Figure 26. QBVW025 Packaging Tray
LINEAGE POWER
16
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Ordering Information
Please contact your Lineage Power Sales Representative for pricing, availability and optional features.
Table 1. Device Codes
Product codes
QBVW025A0BZ
QBVW025A0B1Z
QBVW025A0B41Z
QBVW025A0B61Z
QBVW025A0B64Z
QBVW025A0B641Z
QBVW025A0B841Z
QBVW025A0B964Z
QBVW025A0B1-HZ
QBVW025A0B41-HZ
QBVW025A0B51-HZ
QBVW025A0B61-HZ
QBVW025A0B641-HZ
QBVW025A0B941-HZ
QBVW025A0B-PHZ
QBVW025A0B1-PHZ
QBVW025A0B41-PHZ
QBVW025A0B641-PHZ
LINEAGE POWER
Input Voltage
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
48V (3675Vdc)
Output
Voltage
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
12V
Output
Current
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
25A
Efficiency
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
96.0%
Connector
Type
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Through hole
Comcodes
CC109167796
CC109167383
CC109166195
CC109167391
CC109169875
CC109166204
CC109168407
CC109173167
CC109167400
CC109166798
CC109167417
CC109167821
CC109166815
150020599
CC109170065
CC109167425
CC109167433
CC109173092
17
Data Sheet
May 16, 2012
QBVW025A0B Series Power Modules; DC-DC Converters
36-75Vdc Input; 12Vdc Output; 25A Output Current
Table 2. Device Options
Asia-Pacific Headquarters
Tel: +86.021.54279977*808
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: [email protected]
Europe, Middle-East and Africa Headquarters
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
application. 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.
Document No: ds11-002 ver 1.3
PDF Name: QBVW025A0B.pdf