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407244714 View Datasheet(PDF) - Tyco Electronics

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407244714 Datasheet PDF : 20 Pages
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Data Sheet
July 1999
JW050A, JW075A, JW100A, JW150A Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
Test Configurations
TO OSCILLOSCOPE
LTEST
CURRENT
PROBE
BATTERY
12 µH
CS 220 µF
ESR < 0.1
@ 20 °C, 100 kHz
33 µF
ESR < 0.7
@ 100 kHz
VI(+)
VI(–)
8-203 (C).l
Note: Measure input reflected-ripple current with a simulated source
inductance (LTEST) of 12 µH. Capacitor CS offsets possible bat-
tery impedance. Measure current as shown above.
Figure 17. Input Reflected-Ripple Test Setup
II
SUPPLY
SENSE(+)
VI(+)
VO(+)
CONTACT AND
DISTRIBUTION LOSSES
IO
LOAD
CONTACT
RESISTANCE
VI(–)
VO(–)
SENSE(–)
8-749 (C)
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.
η
=
[---V-[--V-O---I-(-(-+-+--)-)---–-–-----V-V---O-I--(-(-–-–--)-)-]-]--I-I-I-O--
x 100
%
Figure 19. Output Voltage and Efficiency
Measurement Test Setup
VO(+)
VO(–)
COPPER STRIP
1.0 µF
10 µF SCOPE
RESISTIVE
LOAD
8-513 (C).d
Note: Use a 1.0 µF ceramic capacitor and a 10 µF aluminum or tan-
talum 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. Peak-to-Peak Output Noise
Measurement Test Setup
Design Considerations
Input Source Impedance
The power module should be connected to a low
ac-impedance input source. Highly inductive source
impedances can affect the stability of the power mod-
ule. For the test configuration in Figure 17, a 33 µF
electrolytic capacitor (ESR < 0.7 at 100 kHz)
mounted close to the power module helps ensure sta-
bility of the unit. For other highly inductive source
impedances, consult the factory for further application
guidelines.
Tyco Electronics Corp
9
 

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