JW050M Lineage Power, JW050M Datasheet - Page 9

• Manufacturer Part Number: JW050M
• Manufacturer: Lineage Power

April 2008
Feature Descriptions
Output Voltage Set-Point Adjustment
(Trim)
Figure 13. 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 30 W and 45 W modules feature an overtempera-
ture 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.
Lineage Power
100k
100
10k
1M
1k
(continued)
0
Voltage
% CHANGE IN OUTPUT VOLTAGE (•%)
3
6
dc-dc Converters; 36 to 75 Vdc Input, 1.5 Vdc Output; 15 W to 45 W
(continued)
9
12
8-2117 (C)
15
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 14.
Note: Top view, pin locations are for reference only.
Figure 14. Case Temperature Measurement
The temperature at this location should not exceed
100 °C. The output power of the module should not
exceed the rated power for the module as listed in the
Ordering Information table.
Although the maximum case temperature of the power
modules is 100 °C, you can limit this temperature to a
lower value for extremely high reliability.
For additional information on these modules, refer to
the Thermal Management JC-, JFC-, JW-, and JFW-
Series 50 W to 150 W Board-Mounted Power Modules
Technical Note
(TN97-008EPS).
7.6 (0.3)
Measurements shown in millimeters and (inches).
Location
V
ON/OFF
CASE
V
I
I
38.0 (1.50)
(+)
(–)
+ SEN
– SEN
V
V
TRIM
O
O
(–)
(+)
MEASURE CASE
TEMPERATURE HERE
8-716 (C).f
C
)
9