GE
Data Sheet
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 1
QBVW033A0B Barracuda* Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
Features
Compliant to RoHS II EU “Directive 2011/65/EU (-Z versions)
Compliant to REACH Directive (EC) No 1907/2006
Compatible with reflow pin/paste soldering process
High and flat efficiency profile >95.5% at 12V
dc
, 30% load to
100% output
Wide Input voltage range: 36-75V
dc
Delivers up to 33A
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)
ANSI/ UL
#
60950-1-2011 Recognized, CAN/CSA
†
C22.2
No.60950-1-07, Second Edition + A1:2011 (MOD) Certified IEC
60950-1:2005 (2nd edition) + A1:2009 and EN 60950-1:2006 +
A11:2009 + A1:2010 + A12:2011, and VDE‡ 0805-1 Licensed
CE mark 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 QBVW033A0B 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 QBVW033A0B series operate from an
input voltage range of 36 to 75Vdc and provide up to 33A 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.
* Trademark of General Electric Company
# UL is a registered trademark of Underwriters Laboratories, Inc.
† CSA is a registered trademark of Canadian Standards Association.
‡ VDE is a trademark of Verband Deutscher Elektrotechniker e.V.
§ This product is intended for integration into end-user equipment . All of the required procedures of end-use equipment should be followed.
¤ IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers, Incorporated.
** ISO is a registered trademark of the International Organization of Standards.
RoHS Compliant
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 2
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 - - 12 Adc
(VIN=0V to 75V, IO=IO, max)
Input No Load Current All IIN,No load
80 mA
(VIN = VIN, nom, IO = 0, module enabled)
Input Stand-by Current All IIN,stand-by
22 mA
(VIN = VIN, nom, module disabled)
External Input Capacitance All 100 - - μF
Inrush Transient All I2t - - 1 A2s
Input Terminal Ripple Current
(Measured at module input pin with maximum specified input
capacitance and ൏ 500uH inductance between voltage source
and input capacitance)
5Hz to 20MHz, VIN= 45V to 56V, IO= IOmax
All - 350 - mArms
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.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 3
Electrical Specifications (continued)
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions.
Parameter Device Symbol Min Typ Max Unit
Output Voltage Set-point (VIN=VIN,nom, IO=16.5A, 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
Option VO 11.76 12.24 Vdc
All w/ P
Option VO 11.63 12.37 Vdc
Output Voltage (VIN=36V, TA = 25ºC) All VO 11.00 Vdc
Output Regulation [VIN, min = 40V]
Line (VIN= VIN, min to VIN, max) All w/o 9
o
p
tion
0.2 % VO, set
Line (VIN= VIN, min to VIN, max) All w/ 9
o
p
tion
0.5 % VO, set
Load (IO=IO, min to IO, max) All w/o P or
9
o
p
tion
0.2 % VO, set
Load (IO=IO, min to IO, max) All w/ 9
o
p
tion
1.2 % VO, set
Load (IO=IO, min to IO, max), Intentional Droop All w/ P
O
p
tion
0.50 Vdc
Temperature (TA = -40ºC to +85ºC) All 2 % VO, set
Output Ripple and Noise on nominal output
(VIN=VIN, nom and IO=IO, min to IO, max)
RMS (5Hz to 20MHz bandwidth) All 70 mVrms
Peak-to-Peak (5Hz to 20MHz bandwidth) All 200 mVpk-pk
External Output Capacitance
For CO >5000uF, IO must be < 50% IO, max during Trise. All CO, max 0 10,000 μF
When 2 or more modules are in parallel -P Option 0 15,000 μF
Output Current All IO 0 33 Adc
Output Current Limit Inception All IO,lim 40 Adc
Efficiency (VIN=VIN, nom, TA=25°C)
IO=100% IO, max, VO= VO,set All 95.5
IO=40% IO, max to 75% IO, max , VO= VO,set All η 96.0 %
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
__
500
700
__
mVpk
s
Load Change from IO = 75% to 50% of IO,max:
Peak Deviation
Settling Time (VO <10% peak deviation)
All
Vpk
ts
__
__
500
700
__
mVpk
s
General Specifications
Parameter Symbol Device Typ Unit
Calculated Reliability Based upon Telcordia SR-332 Issue 2:
Method I, Case 3, (IO=80%IO, max, TA=40°C, Airflow = 200 LFM), 90%
confidence
MTBF All 3,108,685 Hours
FIT All 321.7 109/Hours
Weight – Open Frame 47.4 (1.67) g (oz.)
Weight – with Base plate option 66.4 (2.34) g (oz.)
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 4
Isolation Specifications
Parameter Symbol Min Typ Max Unit
Isolation Capacitance Ciso 1000 pF
Isolation Resistance Riso 10 MΩ
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”
Lo
g
ic Low = module On, Lo
g
ic Hi
g
h = module Off
Positive Logic: No device code suffix required
Logic Low = module Off, Logic High = module On
Logic Low Specification
On/Off Thresholds:
Remote On/Off Current – Logic Low (Vin =100V) All Ion/off 280 310 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
Remote Sense Range All w/ 9
option VSense 0.5 Vdc
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
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
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 5
Characteristic Curves, 12Vdc Output
The following figures provide typical characteristics for the QBVW033A0B (12V, 33A) at 25ºC. The figures are identical for either
positive or negative Remote On/Off logic.
INPUT CURRENT, Ii (A)
η
INPUT VOLTAGE, VO (V) OUTPUT CURRENT, IO (A)
Figure 1. Typical Input Characteristic. Figure 2. Typical Converter Efficiency vs. Output Current.
OUTPUT VOLTAGE,
VO (V) (50mV/div)
OUTPUT CURRENT OUTPUT VOLTAGE
IO (A) (10A/div) VO (V) (200mV/div)
TIME, t (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.
O
UTPUT V
O
LTA
G
E INPUT V
O
LTA
G
E
VO (V) (5V/div) VIN(V) (20V/div)
OUTPUT VOLTAGE On/Off VOLTAGE
VO (V) (5V/div) VON/OFF (V)(2V/div)
TIME, t (20 ms/div) TIME, t (5 ms/div)
Figure 5. Typical Start-Up Using Vin with Remote On/Off
enabled, negative logic version shown.
Figure 6. Typical Start-Up Using Remote On/Off with Vin
applied, negative logic version shown.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 6
Characteristic Curves, 12Vdc Output (continued)
.
OUTPUT VOLTAGE, VO (V)
OUTPUT VOLTAGE
,
V
O
(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 VOLTAGE, VO (V)
INPUT VOLTAGE, Vin (V) OUTPUT CURRENT, IO (A)
Figure 9. Typical Output Voltage Regulation vs. Input
Voltage for the –P Version.
Figure 10. Typical Output Voltage Regulation vs. Output
Current for the –P Version.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 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. Output Voltage and Efficiency 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., ANSI/ UL* 60950-1-
2011 Recognized, CAN/CSA† C22.2 No.60950-1-07, Second
Edition + A1:2011 (MOD) Certified IEC 60950-1:2005 (2nd edition)
+ A1:2009 and EN 60950-1:2006 + A11:2009 + A1:2010 +
A12:2011, and VDE‡ 0805-1 Licensed
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
CONT ACT AND
SUPPLY
I
I
CONTACT
V
I
(+)
V
I
(–)
V
O1
DISTRIBUTIO N LOSSES
RESISTANCE
I
O
V
O2
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 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 10µA. If using an external voltage source, the maximum
voltage Von/off on the pin is 14.5V with respect to the VIN(-)
terminal.
If not using the remote on/off feature, perform one of the
following to turn the unit on:
For negative logic, short ON/OFF pin to VIN(-).
For positive logic: leave ON/OFF pin open.
Figure 14. Remote On/Off Implementation.
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 QBVW033A0 power module
offers an optional feature for parallel operation (-P Option
code). This feature provides a precise forced output voltage
load regulation droop characteristic. The output set point and
droop slope are factory calibrated to insure optimum matching
of multiple modules’ load regulation characteristics. To
implement load sharing, the following requirements should be
followed:
The VOUT(+) and VOUT(-) pins of all parallel modules must be
connected together. Balance the trace resistance for each
module’s path to the output power planes, to insure best load
sharing and operating temperature balance.
VIN must remain between 40Vdc and 75Vdc for droop sharing to
be functional.
It is permissible to use a common Remote On/Off signal to
start all modules in parallel.
These modules contain means to block reverse current flow
upon start-up, when output voltage is present from other
parallel modules, thus eliminating the requirement for external
output ORing devices. Modules with the –P option may
automatically increase the Turn On delay, Tdelay, as specified in
the Feature Specifications Table, if output voltage is present
on the output bus at startup.
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.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 9
Feature Descriptions (continued)
Insure that the total load is <50% IO,MAX (for a single module)
until all parallel modules have started (load full start > module
Tdelay time max + Trise time).
If fault tolerance is desired in parallel applications, output
ORing devices should be used to prevent a single module
failure from collapsing the load bus.
Remote Sense (“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)
V
O
(+)
TRIM
V
O
(-)
R
trim-down
LOAD
QBVW033A0 R
trim-up
Figure 16. Circuit Configuration to Trim Output Voltage.
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.
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).
GE
Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 10
Feature Descriptions (continued)
Thermal Considerations
The thermal data presented here is based on physical
measurements taken in a wind tunnel, using automated
thermo-couple instrumentation to monitor key component
temperatures: FETs, diodes, control ICs, magnetic cores,
ceramic capacitors, opto-isolators, and module pwb
conductors, while controlling the ambient airflow rate and
temperature. For a given airflow and ambient temperature, the
module output power is increased, until one (or more) of the
components reaches its maximum derated operating
temperature, as defined in IPC-9592B. This procedure is then
repeated for a different airflow or ambient temperature until a
family of module output derating curves is obtained.
The power modules operate in a variety of thermal
environments and sufficient cooling should be provided to help
ensure reliable operation. Thermal considerations include
ambient temperature, airflow, module power dissipation, and
the need for increased reliability. A reduction in the operating
temperature of the module will result in an increase in
reliability.
Heat-dissipating components are mounted on the top side of
the module. Heat is removed by conduction, convection and
radiation to the surrounding environment. Proper cooling can
be verified by measuring the thermal reference
temperature
(TH
1
or TH
2
). Peak temperature occurs at the position indicated
in Figure 17 and 18. For reliable operation this temperature
should not exceed TH
1
=125°C or TH
2
=105°C. For extremely high
reliability you can limit this temperature to a lower value.
.
Figure 17. Location of the thermal reference temperature
TH
1
for open frame module.
Figure 18. Location of the thermal reference temperature
TH
2
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 TH
x
temperature versus local ambient temperature
(T
A
) for several air flow conditions.
The use of Figure 19 is shown in the following example:
Example
What is the minimum airflow necessary for a QBVW033A0B
operating at V
I
= 48 V, an output current of 20A, and a
maximum ambient temperature of 60 °C in transverse
orientation.
Solution:
Given: V
in
= 48V, I
O
= 20A, T
A
= 60 °C Determine required airflow
velocity (Use Figure 19):
Velocity = 0.5m/s (100 LFM) or greater.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 11
Thermal Considerations (continued)
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 19. Output Current Derating for the Open Frame
QBVW033A0B in the Transverse Orientation; Airflow
Direction from Vin(-) to Vin(+); Vin = 48V.
Figure 22. Output Current Derating for the Base plate
QBVW033A0B-H with 0.5” heatsink in the Transverse
Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 20. Output Current Derating for the Base plate
QBVW033A0B-H in the Transverse Orientation; Airflow
Direction from Vin(-) to Vin(+); Vin = 48V.
Figure 23. Output Current Derating for the Base plate
QBVW033A0B-H with 1.0” heatsink in the Transverse
Orientation; Airflow Direction from Vin(-) to Vin(+); Vin = 48V.
OUTPUT CURRENT, IO (A)
OUTPUT CURRENT, IO (A)
LOCAL AMBIENT TEMPERATURE, TA (C)
COLD WALL TEMPERATURE, TC (C)
Figure 21. Output Current Derating for the Base plate
QBVW033A0B-H with 0.25” heatsink in the Transverse
Orientation; Airflow Direction from Vin(-) to Vin(+); Vin =
48V
Figure 24. Output Current Derating for the Base Plate
QBVW033A0B-H in a Cold wall application; Local Internal Air
Temperature near module=80C, VIN = 48V, VOUT setting
anywhere from 6.0V to 12.0V.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 12
Layout Considerations
The QBVW033 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 the 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.
Figure 25. Recommended linear reflow profile using
Sn/Ag/Cu solder.
MSL Rating
The QBVW033A0B modules have a MSL rating of 2a.
Storage and Handling
The recommended storage environment and handling
procedures for moisture-sensitive surface mount packages
is detailed in J-STD-033 Rev. A (Handling, Packing, Shipping
and Use of Moisture/Reflow Sensitive Surface Mount
Devices). Moisture barrier bags (MBB) with desiccant are
required for MSL ratings of 2 or greater. These sealed
packages should not be broken until time of use. Once the
original package is broken, the floor life of the product at
conditions of 30°C and 60% relative humidity varies
according to the MSL rating (see J-STD-033A). The shelf life
for dry packed SMT packages will be a minimum of 12
months from the bag seal date, when stored at the following
conditions: < 40° C, < 90% relative humidity.
Post Solder Cleaning and Drying
Considerations
Post solder cleaning is usually the final circuit-board
assembly process prior to electrical board testing. The result
of inadequate cleaning and drying can affect both the
reliability of a power module and the testability of the
finished circuit-board assembly. For guidance on
appropriate soldering, cleaning and drying procedures, refer
to GE Board Mounted Power Modules: Soldering and
Cleaning Application Note (AN04-001).
If additional information is needed, please consult with your
GE representative for more details.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 13
EMC Considerations
The circuit and plots in Figure 25 shows a suggested
configuration to meet the conducted emission limits of
EN55022 Class A. For further information on designing for
EMC compliance, please refer to the FLT012A0Z data sheet.
Figure 26. EMC Considerations
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 14
Mechanical Outline for QBVW033A0B 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 GE name, product designation, and data code.
** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options.
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 15
Mechanical Outline for QBVW033A0B-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 GE name, product designation, and data code
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 16
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
Hole and Pad diameter recommendations:
Pin Number Hole Dia mm [in] Pad Dia mm [in]
1, 2, 3, 5, 6, 7 1.6 [.063] 2.1 [.083]
4, 8 2.2 [.087] 3.2 [.126]
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 17
Packaging Details
All versions of the QBVW033A0Bare supplied as standard in the plastic trays shown in Figure 27.
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 QBVW033A0B 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 27. QBVW033 Packaging Tray
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
May 9, 2013 ©2012 General Electric Company. All rights reserved. Page 18
Ordering Information
Please contact your GE Sales Representative for pricing, availability and optional features.
Table 1. Device Codes
Product codes Input Voltage Output
Voltage
Output
Current Efficiency Connector
Type Comcodes
QBVW033A0B41Z 48V (3675Vdc) 12V 33A 95.5% Through hole CC109165247
QBVW033A0B64Z 48V (3675Vdc) 12V 33A 95.5% Through hole 150023767
QBVW033A0B541Z 48V (3675Vdc) 12V 33A 95.5% Through hole CC109165263
QBVW033A0B641Z 48V (3675Vdc) 12V 33A 95.5% Through hole CC109165692
QBVW033A0B841Z 48V (3675Vdc) 12V 33A 95.5% Through hole CC109169347
QBVW033A0B1-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109168126
QBVW033A0B41-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109165255
QBVW033A0B61-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109167813
QBVW033A0B64-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole 150023766
QBVW033A0B641-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109165701
QBVW033A0B841-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole 150027041
QBVW033A0B941-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109170627
QBVW033A0B964-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole 150026356
QBVW033A0B9641-HZ 48V (3675Vdc) 12V 33A 95.5% Through hole 150019350
QBVW033A0B41-PZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109169314
QBVW033A0B541-PZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109167086
QBVW033A0B841-PZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109169355
QBVW033A0B1-PHZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109167094
QBVW033A0B41-PHZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109167103
QBVW033A0B61-PHZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109167111
QBVW033A0B641-PHZ 48V (3675Vdc) 12V 33A 95.5% Through hole CC109167540
Table 2. Device Options
GE Data Sheet
QBVW033A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 33.0A, 400W Output
Contact Us
For more information, call us at
USA/Canada:
+1 888 546 3243, or +1 972 244 9288
Asia-Pacific:
+86.021.54279977*808
Europe, Middle-East and Africa:
+49.89.878067-280
India:
+91.80.28411633
www.ge.com/powerelectronics
May 9, 2013 ©2012 General Electric Company. All rights reserved. Version 1.41
