JBW050F Power Modules: dc-dc Converter;
36 to 75 Vdc Input, 3.3 Vdc Output; 33 W
Data Sheet
September 20, 2004
The voltage between the VO(+) and VO(–) terminals
must not exceed the minimum value of the output over-
voltage protection. This limit includes any increase in
voltage due to remote-sense compensation and output
voltage set-point adjustment (trim). See Figure 12.
Feature Descriptions (continued)
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.
VI(+)
VO(+)
ON/OFF SENSE(+)
Radj-up
CASE
VI(–)
TRIM
SENSE(–)
VO(–)
RLOAD
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.
8-715b
Figure 15. Circuit Configuration to Increase
Output Voltage
10M
1M
VI(+)
VO(+)
ON/OFF SENSE(+)
100k
10k
CASE
VI(–)
TRIM
SENSE(–)
VO(–)
RLOAD
Radj-down
0
2
4
6
8
10
% CHANGE IN OUTPUT VOLTAGE ( % )
8-2090
8-748b
Figure 16. Resistor Selection for Increased Output
Voltage
Figure 13. Circuit Configuration to Decrease
Output Voltage
Output Overvoltage Protection
1M
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.
100k
10k
1k
Overtemperature Protection
100
The module features an overtemperature protection cir-
cuit to safeguard against thermal damage.
0
10
20
30
40
% CHANGE IN OUTPUT VOLTAGE (∆%)
The circuit shuts down the module when the maximum
case temperature is exceeded. The module restarts
automatically after cooling.
8-879
Figure 14. Resistor Selection for Decreased
Output Voltage
10
Tyco Electronics Power Systems
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
