JW050F, JW075F, JW100F, JW150F Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 99 W
Data Sheet
April 2008
Feature Descriptions (continued)
Output Voltage Set-Point Adjustment
10M
(Trim) (continued)
1M
V
I
(+)
VO(+)
ON/OFF
CASE
SENSE(+)
100k
10k
TRIM
R
LOAD
R
adj-down
V
I
(–)
SENSE(–)
VO(–)
0
2
4
6
8
10
% CHANGE IN OUTPUT VOLTAGE (•%)
8-748 (C).b
8-2090 (C)
Figure 22. Circuit Configuration to Decrease
Output Voltage
Figure 25. Resistor Selection for Increased Output
Voltage
Output Overvoltage Protection
1M
The output overvoltage clamp consists of control cir-
cuitry, independent of the primary regulation loop, that
monitors the voltage on the output terminals. The con-
trol loop of the clamp has a higher voltage set point
than the primary loop (see Feature Specifications
table). This provides a redundant voltage control that
reduces the risk of output overvoltage.
100k
10k
1k
Overtemperature Protection
The 100 W and 150 W modules feature an overtemper-
ature protection circuit to safeguard against thermal
damage.
100
0
10
20
30
40
% CHANGE IN OUTPUT VOLTAGE (•%)
The circuit shuts down the module when the maximum
case temperature is exceeded. The module restarts
automatically after cooling.
8-879 (C)
Figure 23. Resistor Selection for Decreased
Output Voltage
Thermal Considerations
Introduction
V
I
(+)
VO(+)
ON/OFF
CASE
SENSE(+)
R
adj-up
The power modules operate in a variety of thermal
environments; however, sufficient cooling should be
provided to help ensure reliable operation of the unit.
Heat-dissipating components inside the unit are ther-
mally coupled to the case. Heat is removed by conduc-
tion, convection, and radiation to the surrounding
environment. Proper cooling can be verified by mea-
suring the case temperature. Peak temperature (TC)
occurs at the position indicated in Figure 26.
R
LOAD
TRIM
V
I
(–)
SENSE (–)
VO(–)
8-715 (C).b
Figure 24. Circuit Configuration to Increase
Output Voltage
12
Lineage Power
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
