Data Sheet
October 2, 2009
CPKW002A0C1 Power Module; dc-dc Converter
36 – 75 Vdc Input; 15Vdc 2A Output
Test Configurations
TO OSCILLOSCOPE
L
TEST
Vin+
12μH
CURRENT PROBE
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance source. Highly inductive source
impedance can affect the stability of the power module.
For the test configuration in Figure 7 a 33μF 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.
BATTERY
C
S
220μF
33μF
E.S.R.<0.1Ω
@ 20°C 100kHz
Vin-
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, CSA C22.2 No. 60950-1-03, and VDE
0805 (IEC60950, 3
rd
Edition).
The modules spacing (creepages and clearances) have
been designed to meet Functional Insulation.
NOTE: Measure input reflected ripple current with a simulated
source inductance (L
TEST
) of 12μH. Capacitor C
S
offsets
possible battery impedance. Measure current as shown
above.
Figure 7. Input Reflected Ripple Current Test Setup
COPPER STRIPS
Vout+
SCOPE
Vout-
1μF
10μF
R
LOAD
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:
•
NOTE: Use a 1μF ceramic capacitor and a 10μF aluminium or
tantalum capacitor. The scope measurement should be
made using a BNC socket. Position the load 50mm to
75mm (2" to 3") from the module.
The input source is to be provided with reinforced
insulation from any other hazardous voltages,
including the ac mains.
If the output pins are accessible to the end user,
then to maintain the output voltage to ground (earth)
within ELV or SELV limits, Vin(+) pin of the input
and Vout (-) pin of the output must be reliably
grounded (earthed) in the end application.
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.
•
Figure 8. Output Ripple and Noise Test Setup
•
R
distribution
R
contact
Vin+
Vout+
R
contact
R
distribution
•
V
IN
V
O
R
LOAD
R
distribution
R
contact
Vin-
Vout-
R
contact
R
distribution
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 3A fast-acting fuse in the ungrounded lead.
NOTE: All voltage measurements to be taken at the module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Figure 9. Output Voltage and Efficiency Test Setup
⎡
V
O
×
I
O
⎤
Efficiency
(
η
)
= ⎢
×
100
(
%
)
V
IN
×
I
IN
⎥
⎦
⎣
LINEAGE
POWER
7
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
