JW050F Lineage Power, JW050F Datasheet - Page 12

• Manufacturer Part Number: JW050F
• Manufacturer: Lineage Power

dc-dc Converters; 36 to 75 Vdc Input, 3.3 Vdc Output; 33 W to 99 W
Feature Descriptions
Output Voltage Set-Point Adjustment
(Trim)
Figure 22. Circuit Configuration to Decrease
Figure 23. Resistor Selection for Decreased
Figure 24. Circuit Configuration to Increase
12
12
(continued)
100k
100
10k
1M
1k
Output Voltage
Output Voltage
Output Voltage
V
ON/OFF
CASE
V
0
V
ON/OFF
CASE
V
I
I
(+)
(–)
I
I
(+)
(–)
% CHANGE IN OUTPUT VOLTAGE (•%)
SENSE(+)
SENSE(+)
SENSE (–)
SENSE(–)
10
V
TRIM
V
V
TRIM
V
O
O
O
O
(+)
(–)
(+)
(–)
(continued)
20
R
R
adj-up
adj-down
30
R
LOAD
R
8-748 (C).b
8-715 (C).b
LOAD
40
8-879 (C)
Figure 25. Resistor Selection for Increased Output
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.
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.
Thermal Considerations
Introduction
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 (T
occurs at the position indicated in Figure 26.
100k
10M
10k
1M
0
Voltage
% CHANGE IN OUTPUT VOLTAGE (•%)
2
4
6
Lineage Power
April 2008
8
8-2090 (C)
10
C
)