JC075F Lineage Power, JC075F Datasheet - Page 10

• Manufacturer Part Number: JC075F
• Manufacturer: Lineage Power

JC050F, JC075F, JC100F Power Modules: dc-dc Converters;
18 Vdc to 36 Vdc Input, 3.3 Vdc Output; 33 W to 66 W
10
10
Feature Descriptions
Output Voltage Set-Point Adjustment
(Trim)
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of Δ%.
The test results for this configuration are displayed in
Figure 21.
The voltage between the V
must not exceed 3.8 V. This limit includes any increase
in voltage due to remote-sense compensation and out-
put voltage set-point adjustment (trim). See Figure 17.
If not using the trim feature, leave the TRIM pin open.
Figure 18. Circuit Configuration to Decrease
Figure 19. Resistor Selection for Decreased
100k
R
100
10k
1M
1k
adj-up
V
ON/OFF
CASE
V
0
I
I
(+)
(–)
(continued)
=
Output Voltage
Output Voltage
⎛
⎝
V
------------------------------------- -
% CHANGE IN OUTPUT VOLTAGE (Δ%)
SENSE(+)
SENSE(–)
O
1.225Δ%
(
10
100
V
TRIM
V
O
O
(+)
(–)
+
Δ%
O
(+) and V
)
20
(continued)
–
(
--------------------------------- -
100
R
adj-down
Δ%
+
O
(–) terminals
2Δ%
30
)
⎞ kΩ
⎠
R
LOAD
8-748 b
40
8-879
Figure 20. Circuit Configuration to Increase
Figure 21. Resistor Selection for Increased Output
Output Overvoltage Clamp
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 (Shutdown)
The 66 W module features an overtemperature
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.
V
ON/OFF
CASE
V
100k
I
I
10M
(+)
(–)
10k
1M
0
Output Voltage
Voltage
SENSE(+)
SENSE(–)
% CHANGE IN OUTPUT VOLTAGE (Δ%)
2
V
TRIM
V
O
O
(+)
(–)
4
Lineage Power
March 2008
Data Sheet
6
R
adj-up
8
R
LOAD
10
8-715 b
8-880 a