QBDW025A0B Datasheet, PDF (8/32 Pages) Lineage Power Corporation – 36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output

GE
Data Sheet
QBDW025A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 25.0A, 300W Output
Test Configurations
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance source. A highly inductive source impedance
can affect the stability of the power module. For the test
configuration in Figure 10, a 100μF electrolytic capacitor, Cin,
(ESR<0.7 at 100kHz), mounted close to the power module
helps ensure the stability of the unit. If the module is
subjected to rapid on/off cycles, a 330μF input capacitor is
required. Consult the factory for further application
guidelines.
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.
II
SUPPLY
VI(+)
CONTACT AND
DISTRIBUTION LOSSES
VO1
IO
LOAD
VI(–)
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.
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^nd Ed., CSA C22.2 No. 60950-1 2^nd Ed., and
VDE0805-1 EN60950-1 2^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 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 unearthed lead.
The power module has internally generated voltages
exceeding safety extra-low voltage. Consideration should be
taken to restrict operator accessibility.
Figure 13. Output Voltage and Efficiency Test Setup.
May 9, 2013
©2012 General Electric Company. All rights reserved.
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