QBK025A0B1 Datasheet, PDF (7/16 Pages) Lineage Power Corporation – 36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current

Data Sheet
March 27, 2008
QBK025A0B DC-DC Power Modules:
36-55Vdc Input; 12Vdc Output Voltage; 25A Output Current
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.
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.
Figure 11. Output Voltage and Efficiency Test
Setup.
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 9, a 100μF
electrolytic capacitor (ESR<0.7Ω at 100kHz), mounted
close to the power module helps ensure the stability of
the unit. Consult the factory for further application
guidelines.
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., UL 1950, CSA C22.2 No. 60950-00,
and VDE 0805:2001-12 (IEC60950 3^rd Ed).
If the input source is non-SELV, 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:
ƒ The input source is to be provided with reinforced
insulation from any other hazardous voltages,
including the ac mains.
ƒ One V_IN pin and one V_OUT pin are to be grounded,
or both the input and output pins are to be kept
floating.
ƒ The input pins of the module are not operator
accessible.
ƒ 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 extra-low voltage (ELV)
outputs when all inputs are ELV.
The input to these units is to be provided with a
maximum 15 A fast-acting (or time-delay) fuse in the
unearthed lead.
LINEAGE POWER
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