Data Sheet
EQW012/020/023/025 Series, Eighth-Brick Power Modules:
36 - 75Vdc Input; 1.2Vdc to 5Vdc Output; 12A to 25A Output
December 12, 2008
stability of the unit. Consult the factory for further
application guidelines.
Test Configurations
CURRENT PROBE
TO OSCILLOSCOPE
Safety Considerations
LTEST
VIN(+)
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 and VDE 0805 (IEC60950, 3rd Ed).
12μH
CS 220μF
E.S.R.<0.1Ω
33μF
E.S.R.
<0.1Ω
100kHz
@ 20°C 100kHz
@
These converters have been evaluated to the spacing
requirements for Basic Insulation, per the above
safety standards; and 1500Vdc is applied from Vin to
VIN(-)
NOTE: Measure input reflected ripple current with a simulated
source inductance (LTEST) of 12μH. Capacitor CS offsets
possible battery impedance. Measure current as shown
above.
Vout to 100% of outgoing production..
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.
Figure 37. Input Reflected Ripple Current Test
Setup.
COPPERSTRIP
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:
VO(+)
VO(–)
RESISTIV E
LO AD
1uF
.
10uF
SC O PE
•
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.
GROUND PLANE
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.
•
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 38. Output Ripple and Noise Test Setup.
For all input sources, other than DC MAINS, where
the input voltage is between 60 and 75V dc
(Classified as TNV-2 in Europe), the following must
be adhered to, if the converter’s output is to be
evaluated for SELV:
Rdistribution Rcontact
Rcontact Rdistribution
VIN(+)
VO
RLOAD
•
•
•
The input source is to be provided with reinforced
insulation from any hazardous voltage, including
the AC mains.
VO
VIN
Rdistribution Rcontact
Rcontact Rdistribution
One Vi pin and one Vo pin are to be reliably
earthed, or both the input and output pins are to
be kept floating.
VIN(-)
COM
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.
Another SELV reliability test is conducted on the
whole system, as required by the safety
agencies, on the combination of supply source
and the subject module to verify that under a
single fault, hazardous voltages do not appear at
the module’s output.
Figure 39. Output Voltage and Efficiency Test
Setup.
VO. IO
Efficiency
=
x
100 %
η
VIN. IIN
The power module has ELV (extra-low voltage)
outputs when all inputs are ELV.
Design Considerations
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 37, a
33μF electrolytic capacitor (ESR<0.7Ω at 100kHz),
mounted close to the power module helps ensure the
All flammable materials used in the manufacturing of
these modules are rated 94V-0, and UL60950 A.2 for
reduced thickness. The input to these units is to be
provided with a maximum 6A time- delay in the
unearthed lead.
LINEAGE POWER
12
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
