GE Industrial Solutions JNCW016A0R Orca Series - Manual (Page 6)

GE
Data Sheet
JNCW016A0R Orca Series; DC-DC Converter Power Modules
36–75 Vdc Input; 28.0Vdc Output; 16Adc Output
August 14, 2013 ©2012 General Electric Company. All rights reserved. Page 6
Test Configurations
Note: Measure the input reflected-ripple current with a simulated
source inductance (LTEST) of 12 µH. Capacitor CS offsets possible
battery impedance. Measure the current, as shown above.
Figure 7. Input Reflected Ripple Current Test Setup.
Note: Use a Cout (470 µF Low ESR aluminum or tantalum capacitor
typical), a 0.1 µF ceramic capacitor and a 10 µF ceramic capacitor,
and 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 8. 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 9. 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 7, a 470μF Low ESR aluminum
capacitor, C
IN
, mounted close to the power module helps
ensure the stability of the unit. Consult the factory for further
application guidelines.
Output Capacitance
The JNCW016A0R power module requires a minimum
output capacitance of 440µF low ESR capacitor, C
out
to
ensure stable operation over the full range of load and line
conditions, see Figure 8. If the ambient temperature at
module startup is between 0
O C and -10 O C, it is required to
use at least 660uF aluminum or 440uF polymer capacitors;
and if the ambient temperature at module startup is
between -10
O C and -20 O C, it is required to use at least
880uF aluminum or 440uF polymer capacitors. If the
ambient temperature at module startup is below -20 O C, it is
required to use only 440uF polymer capacitors. Use of
polymer capacitors can be avoided by suitable warmup
time, when starting from -40
O C. In general, the process of
determining the acceptable values of output capacitance
and ESR is complex and is load-dependent.
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
60950-1, 2nd Ed., CSA No. 60950-1 2
nd Ed., and VDE0805-1
EN60950-1, 2nd Ed.
For end products connected to –48V dc, or –60Vdc nominal
DC MAINS (i.e. central office dc battery plant), no further fault
testing is required. *Note: -60V dc nominal battery plants
are not available in the U.S. or Canada.
For all input voltages, other than DC MAINS, where the input
voltage is less than 60V dc, if the input meets all of the
requirements for SELV, then:
 The output may be considered SELV. Output voltages
will remain within SELV limits even with internally-
generated non-SELV voltages. Single component failure
and fault tests were performed in the power converters.
 One pole of the input and one pole of the output are to
be grounded, or both circuits are to be kept floating, to
maintain the output voltage to ground voltage within
ELV or SELV limits. However, SELV will not be
maintained if V
I
(+) and V
O
(+) are grounded
simultaneously.