Data Sheet
March 19, 2009
EUE Series DC-DC Power Modules:
42-55/42-58Vdc Input; 12Vdc Output; 200/120W
Test Configurations
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, CSA C22.2 No. 60950-1-
03, EN60950-1 and VDE 0805:2001-12.
For the converter output to be considered meeting the
requirements of safety extra-low voltage (SELV), the
input must meet SELV requirements.
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.
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.
Figure 17. Input Reflected Ripple Current Test
Setup.
•
If the input meets extra-low voltage (ELV)
requirements, then the converter’s output is
considered ELV
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 18. Output Ripple and Noise Test Setup.
CONT
ACT AND
DISTRIBUTION LOSSES
V
I
(+)
I
I
SUPPL
Y
V
I
(–)
CONT
ACT
RESIST
ANCE
V
O2
V
O1
I
O
LOAD
All flammable materials used in the manufacturing of
these modules are rated 94V-0, or tested to the
UL60950 A.2 for reduced thickness.
The input to these units is to be provided with a
maximum 10A fast-acting fuse in the unearthed lead.
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 19. Output Voltage and Efficiency Test
Setup.
V
O
. I
O
Efficiency
η
=
V
IN
. I
IN
x
100 %
LINEAGE
POWER
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
