Data Sheet
August 12, 2010
EQD075 Series Single Output: Eighth Brick Power Modules:
18-60Vdc Input; 3.3 to 5.0Vdc Output; 75
9
Test Configurations
Figure 17. Input Reflected Ripple Current Test
Setup.
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.
V
O
(+)
COM
1uF .
RESISTIVE
LOAD
SCOPE
COPPER STRIP
GROUND PLANE
10uF
Figure 18. Output Ripple and Noise Test Setup.
V
O
COM
V
IN
(+)
COM
R
LOAD
R
contact
R
distribution
R
contact
R
distribution
R
contact
R
contact
R
distribution
R
distribution
V
IN
V
O
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 19. Output Voltage and Efficiency Test
Setup.
=
V
O
. I
O
V
IN
. I
IN
x
100 %
Efficiency
Design Considerations
Input Filtering
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 17, a
220µF electrolytic capacitor (ESR<0.1 at 100 kHz),
mounted close to the power module helps ensure the
stability of the unit. Consult your sales representative
for further applications 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, CSA C22.2 No. 60950-1-
03, EN60950-1 and VDE 0805:2001-12.
These converters have been evaluated to the spacing
requirements for Basic insulation, per the above
safety standards; and 1500 Vdc is applied from V
in
to
V
out
to 100% of outgoing production.
For end products connected to –48V dc nominal DC
MAINS (i.e. central office dc battery plant), no further
fault testing is required. 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.
The power module has ELV (extra-low voltage)
outputs when all inputs are ELV.
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 6.3 A very fast-acting surface mount fuse in
the unearthed lead.
TO OSCILLOSCOPE
CURRENT PROBE
L
TEST
12H
BATTERY
C
S
220F
Electrolytic
E.S.R.<0.1
@ 20°C 100kHz
33
F
Ceramic
V
IN
(+)
COM
NOTE:
Measure input reflected ripple current with a simulated
source inductance (L
TEST
) of 12H. Capacitor C
S
offsets
possible battery impedance. Measure current as shown
above.
C
IN
