JAW050B Lineage Power, JAW050B Datasheet - Page 10

• Manufacturer Part Number: JAW050B
• Manufacturer: Lineage Power

36 Vdc to 75 Vdc Input, 12 Vdc Output; 50 W to 75 W
Feature Descriptions
Output Voltage Set-Point Adjustment (Trim)
(continued)
Although the output voltage can be increased by both
the remote sense and by the trim, the maximum
increase for the output voltage is not the sum of both.
The maximum increase is the larger of either the
remote sense or the trim. Consult the factory if you
need to increase the output voltage more than the
above limitation.
The amount of power delivered by the module is defined
as the voltage at the output terminals multiplied by the
output current. When using remote sense and trim, the
output voltage of the module can be increased, which at
the same output current would increase the power output
of the module. Care should be taken to ensure that the
maximum output power of the module remains at or
below the maximum rated power.
Figure 16. Circuit Configuration to Decrease
Figure 17. Circuit Configuration to Increase
10
10
V
ON/OFF
CASE
V
V
ON/OFF
CASE
V
I
I
I
I
(+)
(–)
(+)
(–)
Output Voltage
Output Voltage
SENSE(+)
SENSE(+)
SENSE(–)
SENSE(–)
V
V
TRIM
V
TRIM
V
O
O
O
O
(+)
(+)
(–)
(–)
(continued)
R
R
adj-up
adj-down
R
R
LOAD
LOAD
8-748 (F).b
8-715 (F).b
Output Overvoltage Protection
To provide protection in an output overvoltage condi-
tion, the unit is equipped with circuitry that monitors the
voltage on the output terminals. If the voltage on the
output terminals exceed the overvoltage protection
threshold, the module enters a hiccup mode of opera-
tion whereby it shuts down and automatically attempts
to restart. As long as the fault persists, the module
remains in this mode.
The protection mechanism is such that the unit can
continue in this condition until the fault is cleared.
Overtemperature Protection
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The cir-
cuit shuts down when the maximum case temperature
is exceeded. The module will automatically restart
when the case temperature cools sufficiently.
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 18.
Note: Top view, pin locations are for reference only. Measurements
Figure 18. Case Temperature Measurement
shown are in millimeters and (inches).
(0.59)
15.0
Location
(0.56)
14.2
V
ON/OFF
CASE
V
I
I
(+)
(–)
MEASURE CASE
TEMPERATURE HERE
+ SEN
– SEN
V
TRIM
V
O
O
(+)
(–)
Lineage Power
April 2008
8-3228 (F)
C
)