Auto-restart after fault shutdown (4=option code, factory
preferred)
Pin Trim
Features
Compliant to RoHS II EU “Directive 2011/65/EU” (-Z versions)
Compliant to REACH Directive (EC) No 1907/2006
High and flat efficiency profile >96.5% at 12.0V
to 100% output
Input voltage range: 52-60V
Delivers up to 50.0A
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 12.7 mm
(2.30 in x 1.45 in x 0.50 in)
Base plate (-H=option code, must be ordered)
Constant switching frequency
Positive Remote On/Off logic
Output over current/voltage protection
Over temperature protection
Wide operating temperature range
-5°C to 85°C, continuous
-20°C to 90°C, short term, ≤ 96hrs/year
#
UL
CE mark to 2006/96/EC directive
750Vdc Functional Isolation
ISO** 9001 and ISO14001 certified manufacturing facilities
07 Certified, and VDE‡ (EN60950-1, 2nd Ed.) Licensed
dc
dc
output current
§
, 50% load
dc
Description
The QBVS050A0B Barracuda series of dc-dc converters are a new generation of fully regulated DC/DC power modules designed to
support 12.0Vdc 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 QBVS050A0B series operate from an input
voltage range of 52 to 60Vdc and provide up to 50.0A output current at output voltages of 12.0V
compliant quarter brick. The converter incorporates digital control, synchronous rectification technology, a fully regulated control
topology, and innovative packaging techniques to achieve efficiency exceeding 97% at 12.0V 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 Can adian 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.
** ISO is a registered trademark of the International Organization of Standards.
QBVS050A0B Barracuda Series; DC-DC Converter Power
Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
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 V
Non- operating continuous V
Operating Ambient Temperature All T
(See Thermal Considerations section)
Storage Temperature All T
I/O Isolation Voltage (100% factory Hi-Pot tested) All
* Input over voltage protection will shutdown the output voltage when the input voltage exceeds threshold level.
IN
IN
A
stg
-0.3 60 Vdc
75 Vdc
-20 85 °C
-55 125 °C
750 Vdc
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 52 54 60 Vdc
Maximum Input Current
(VIN=45V, IO=I
Input No Load Current
(VIN = V
Input Stand-by Current
(VIN = V
External Input Capacitance All 120 600 - μF
Inrush Transient All I2t - - 1 A2s
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; V
see Figure 9)
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= 52V to 60V, IO= I
Input Ripple Rejection (120Hz) All - 25 - dB
)
O, max
, IO = 0, module enabled)
IN, nom
, module disabled)
IN, nom
= 48V, IO= I
Omax
IN
Omax
All I
All I
;
All - 40 - mA
All - - 800 mA
I
IN,max
IN,No load
IN,stand-by
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 25A 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.
QBVS050A0B Barracuda Series; DC-DC Converter Power
Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
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=V
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 =60V) All I
Turn-On Delay and Rise Times (IO=I
T
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 30 milli-seconds (Enable with
on/off).
QBVS050A0B Barracuda Series; DC-DC Converter Power
Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
Characteristic Curves, 12.0Vdc Output
The following figures provide typical characteristics for the QBVS050A0B (12.0V, 50A) at 25ºC. The figures are identical for either
positive or negative Remote On/Off logic.
QBVS050A0B Barracuda Series; DC-DC Converter Power
Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
Characteristic Curves, 12.0Vdc Output (continued)
The following figures provide typical characteristics for the QBVS050A0B (12.0V, 60A) at 25ºC. The figures are identical for either
positive or negative Remote On/Off logic.
(V)
O
OUTPUT VOLTAGE, 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
QBVS050A0B Barracuda Series; DC-DC Converter Power
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
Test Configurations
Note: Measure input reflected-ripple current with a simulated
source inductance (LTEST) of 12 µH. Capacitor CS offsets
possible battery impedance. Measure current as shown above.
Figure 9. Input Reflected Ripple Current Test Setup.
Note: 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 10. Output Ripple and Noise Test Setup.
CONTACT AND
DISTRIBUTION LOSSES
O1
V
I
I
SUPPLY
V
CONTA CT
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.
V
I
(+)
I
(–)
V
I
O
LOAD
O2
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 9, a 680μF electrolytic capacitor, C
(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 2
VDE0805-1 EN60950-1 2
nd
Ed., CSA C22.2 No. 60950-1 2nd Ed., and
nd
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 V
pin and one V
IN
OUT
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
25A fast-acting (or time-delay) fuse in the ungrounded input
lead.
Modules
pin are to be grounded, or
,
in
Figure 11. Output Voltage and Efficiency Test Setup.
QBVS050A0B Barracuda Series; DC-DC Converter Power
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
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 3.0V from V
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 V
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 V
terminal (V
equivalent (see Figure 12). A logic low is V
The typical I
Terminal=0.3V) is 147µA. The switch should maintain a logiclow voltage while sinking 200µA. During a logic high, the
maximum V
maximum allowable leakage current of the switch at V
2.4V is 130µA. If using an external voltage source, the
maximum voltage V
(-) terminal.
the V
IN
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 V
For positive logic: leave ON/OFF pin open.
IN
). The switch can be an open collector or
on/off
during a logic low (Vin=48V, On/Off
on/off
generated by the power module is 8.2V. The
on/off
, the module will shut down and
o,set
(-) terminal. Two factory configured
(-)
IN
= -0.3V to 0.8V.
on/off
on the pin is 14.5V with respect to
on/off
(-).
IN
on/off
=
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.
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).
Peak temperature occurs at the position indicated in Figure
16. For reliable operation this temperature should not
exceed TH
limit this temperature to a lower value. The output power of
the module should not exceed the rated power for the
module as listed in the Ordering Information table.
QBVS050A0B Barracuda Series; DC-DC Converter Power Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
Feature Descriptions (continued)
(A)
O
Figure 16. Location of the thermal reference temperature
for base plate module.
TH
1
Heat Transfer via Convection
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-9592A. This procedure is then
repeated for a different airflow or ambient temperature until
a family of module output derating curves is obtained.
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.
OUTPUT CURRENT, I
Figure 18. Output Current Derating for the QBVS050A0Bxx-H
in the Transverse Orientation;
Airflow Direction from Vin(-) to Vin(+); Vin = 54V.
(A)
O
OUTPUT CURRENT, I
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 19. Output Current Derating for the QBVS050A0Bxx-H
+ 0.5” Heat Sink in the Transverse Orientation;
Airflow Direction from Vin(-) to Vin(+); Vin = 54V.
(A)
O
Figure 17. Thermal Test Setup .
Increased airflow over the module enhances the heat
transfer via convection. The thermal derating of figure 1821 shows the maximum output current that can be
delivered by each module in the indicated orientation
without exceeding the maximum TH
local ambient temperature (T
conditions.
Figure 20. Output Current Derating for the QBVS050A0Bxx-H
in the Longitudinal Orientation;
Airflow Direction from Vout to Vin; Vin = 54V.
LOCAL AMBIENT TEMPERATURE, T
LOCAL AMBIENT TEMPERATURE, T
(C)
A
(C)
A
GE
Data Sheet
QBVS050A0B Barracuda Series; DC-DC Converter Power
Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
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
(A)
O
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. D
(Moisture/Reflow Sensitivity Classification for
Nonhermetic Solid State Surface Mount Devices) for both
Pb-free solder profiles and MSL classification
OUTPUT CURRENT, I
LOCAL AMBIENT TEMPERATURE, TA (C)
Figure 21. Output Current Derating for the QBVS050A0Bxx-H
+ 0.5” Heat Sink in the Longitudinal Orientation;
Airflow Direction from Vout to Vin; Vin = 54V.
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.
Layout Considerations
The QBVS050A0B 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 FLT012A0Z 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 Pbfree reflow process.
Max. sustain temperature :
245C (J-STD-020C Table 4-2: Packaging Thickness>=2.5
/ Volume > 2000
Peak temperature over 245C is not suggested due to the
potential reliability risk of components under continuous
high-temperature.
Figure 22. Recommended linear reflow profile using
Sn/Ag/Cu solder.
MSL Rating
The QBVS050A0B 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-060A). 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.
GE
Data Sheet
QBVS050A0B Barracuda Series; DC-DC Converter Power
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
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 (AN04-001).
If additional information is needed, please consult with your
GE Sales representative for more details
QBVS050A0B Barracuda Series; DC-DC Converter Power Modules
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
Mechanical Outline for QBVS050A0B-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 side label includes GE name, product designation, and data code
SIDE VIEWS
** Standard pin tail length. Optional pin tail lengths shown in Table 2, Device Options.
***Bottom side label includes GE name, product designation, and data code
GE
Data Sheet
QBVS050A0B Barracuda Series; DC-DC Converter Power
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
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.]
QBVS050A0B Barracuda Series; DC-DC Converter Power
52-60Vdc Input; 12.0Vdc, 50.0A, 600W Output
Packaging Details
All versions of the QBVS050A0B are supplied as standard in
the plastic trays shown in Figure 24.
Tray Specification
Material PET (1mm)
Max surface resistivity
Color Clear
Capacity 12 power modules
Min order quantity 24 pcs (1 box of 2 full trays
9
-1011/PET
10
+ 1 empty top tray)
Each tray contains a total of 12 power modules. The trays are
self-stacking and each shipping box for the QBVS050A0B
module contains 2 full trays plus one empty hold-down tray
giving a total number of 24 power modules.