JW050A, JW075A, JW100A, JW150A Power Modules:
dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W
Data Sheet
July 1999
Feature Descriptions
(continued)
10M
ADJUSTMENT RESISTOR VALUE (Ω)
Output Voltage Set-Point Adjustment
(Trim)
(continued)
V
I
(+)
ON/OFF
CASE
V
I
(–)
V
O
(+)
SENSE(+)
TRIM
R
adj-down
SENSE(–)
V
O
(–)
8-748 (C).b
1M
R
LOAD
100k
10k
0
2
4
6
8
10
Figure 22. Circuit Configuration to Decrease
Output Voltage
% CHANGE IN OUTPUT VOLTAGE (∆%)
8-880 (C).a
Figure 25. Resistor Selection for Increased Output
Voltage
1M
ADJUSTMENT RESISTOR VALUE (Ω)
Output Overvoltage Protection
100k
10k
1k
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.
Overtemperature Protection
100
0
10
20
30
40
8-879 (C)
% CHANGE IN OUTPUT VOLTAGE (∆%)
Figure 23. Resistor Selection for Decreased
Output Voltage
The 100 W and 150 W modules feature an overtemper-
ature protection circuit to safeguard against thermal
damage.
The circuit shuts down the module when the maximum
case temperature is exceeded. The module restarts
automatically after cooling.
V
I
(+)
ON/OFF
CASE
V
I
(–)
V
O
(+)
SENSE(+)
R
adj-up
TRIM
SENSE(–)
V
O
(–)
8-715 (C).b
R
LOAD
Figure 24. Circuit Configuration to Increase
Output Voltage
12
Tyco Electronics Corp
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