Data Sheet
April 2008
JW050F, JW075F, JW100F, JW150F Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 99 W
Test Configurations
SENSE(+)
CONTACT AND
DISTRIBUTION LOSSES
V
I
(+)
T O O SC ILLO SC O PE
L
T E S T
12 µ H
C
S
220 µ F
ESR < 0.1 •
33 µ F
@ 20 °C , 100 kH z ESR < 0.7 •
@ 100 kH z
V
I
( –)
C U R R EN T
PR O BE
V
I
( + )
V
O
(+)
I
O
LOAD
I
I
SUPPLY
V
I
(–)
CONTACT
RESISTANCE
V
O
(–)
BAT T ER Y
SENSE(–)
8-749 (C)
8-203 (C).l
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.
Note: Measure input reflected-ripple current with a simulated source
inductance (L
TEST
) of 12 µH. Capacitor C
S
offsets possible bat-
tery impedance. Measure current as shown above.
[
V
O
(+) – V
O
(–)
]I
O
-
η
=
⎛
-----------------------------------------------
⎞
x 100
⎝ [
V
I
(+) – V
I
(–)
]I
I
⎠
%
Figure 17. Input Reflected-Ripple Test Setup
Figure 19. Output Voltage and Efficiency
Measurement Test Setup
COPPER STRIP
V
O
(+)
1.0 µF
V
O
(–)
10 µF
RESISTIVE
LOAD
Design Considerations
Input Source Impedance
SCOPE
8-513 (C).d
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.
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 ¾ 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.
Figure 18. Peak-to-Peak Output Noise
Measurement Test Setup
Lineage Power
9
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
