JC050C1 Datasheet, PDF (10/16 Pages) Lineage Power Corporation – Distributed power architectures

JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
Data Sheet
March 2008
Feature Descriptions(continued)
Output Voltage Set-Point Adjustment
(Trim) (continued)
VI(+)
VO(+)
ON/OFF SENSE(+)
CASE
TRIM
Radj-up
RLOAD
VI(–)
SENSE(–)
VO(–)
8-715 (C).d
Figure 18. Circuit Configuration to Increase
Output Voltage
100M
10M
Overtermperature Protection (Shutdown)
The 100 W module features an overtemperature pro-
tection 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,a nd 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 20.
7.6 (0.3)
38.0 (1.50)
MEASURE CASE
TEMPERATURE HERE
1M
100k
0
2
4
6
8
10
% CHANGE IN OUTPUT VOLTAGE (Δ%)
8-2056 (C)
Figure 19. Resistor Selection for Increased Output
Voltage
Output Overvoltage Clamp
The ouput 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.
VI(+)
ON/OFF
CASE
VI(–)
VO(+)
+ SEN
TRIM
– SEN
VO(–)
Note: Top view, pin locations are for reference.
Measurements shown in millimeters and (inches).
8-716 (C).f
Figure 20. Case Temperature Measurement
Location
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.
10
Lineage Power