GE Industrial Solutions EBVW020A0B Barracuda Series - Manual (Page 7)

GE
Data Sheet
EBVW020A0B Barracuda Series; DC-DC Converter Power Modules
36-75Vdc Input; 12.0Vdc, 20.0A, 240W Output
July 22, 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 12. 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 13. 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 14. 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 12, a 220μF electrolytic capacitor, C
in
, (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.
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 V
IN
pin and one V
OUT
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 15 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.
LOAD
CONTACT AND
SUPPLY
I I
CONTACT
V I (+)
V I (–)
V O1
DISTRIBUTION LOSSES
RESISTANCE
I O
V O2