JW150A Datasheet, PDF (12/20 Pages) Tyco Electronics – Power Modules: dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 W to 150 W

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
Output Voltage Set-Point Adjustment
(Trim) (continued)
1M
VI(+)
VO(+)
ON/OFF SENSE(+)
CASE
VI(–)
TRIM
SENSE(–)
Radj-down
RLOAD
VO(–)
8-748 (C).b
Figure 22. Circuit Configuration to Decrease
Output Voltage
1M
100k
10k
1k
100k
10k
0
2
4
6
8
10
% CHANGE IN OUTPUT VOLTAGE (∆%)
8-880 (C).a
Figure 25. Resistor Selection for Increased Output
Voltage
Output Overvoltage Protection
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.
100
0
10
20
30
40
% CHANGE IN OUTPUT VOLTAGE (∆%)
8-879 (C)
Figure 23. Resistor Selection for Decreased
Output Voltage
Overtemperature Protection
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.
VI(+)
VO(+)
ON/OFF SENSE(+)
CASE
TRIM
Radj-up
RLOAD
VI(–)
SENSE(–)
VO(–)
8-715 (C).b
Figure 24. Circuit Configuration to Increase
Output Voltage
12
Tyco Electronics Corp