JC050A1 Datasheet, PDF (10/16 Pages) Lineage Power Corporation – Small size: 61.0 mm x 57.9 mm x 12.7 mm (2.40 in. x 2.28 in. x 0.50 in.)

JC050A, JC075A, JC100A Power Modules: dc-dc Converters;
18 Vdc to 36 Vdc Input, 5 Vdc Output; 50 W to 100 W
Data Sheet
March 2008
Feature Descriptions (continued)
Remote Sense (continued)
The voltage between the VO(+) and VO(–) terminals
must not exceed 5.9 V. This limit includes any increase
in voltage due to remote-sense compensation and out-
put voltage set-point adjustment (trim), see Figure 18.
If not using the remote-sense feature to regulate the
output at the point of load, then connect SENSE(+) to
VO(+) and SENSE(-) to VO(-) at the module.
SENSE(+)
SENSE(–)
SUPPLY _II
CONTACT
RESISTANCE
VI(+)
VI(–)
VO(+)
VO(–)
IO
LOAD
CONTACT AND
DISTRIBUTION LOSSES
8-651 (C).h
Figure 18. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
The test results for this configuration are displayed in
Figure 22.
The voltage between the VO(+) and VO(–) terminals
must not exceed 5.9 V. This limit includes any increase
in voltage due to remote-sense compensation and out-
put voltage set-point adjustment (trim). See Figure 18.
If not using the trim feature, leave the TRIM pin open.
VI (+)
VO (+)
ON/OFF SENSE(+)
CASE
VI (–)
TRIM
SENSE(–)
Radj-down
RLOAD
VO(–)
8-748 (C).c
Figure 19. Circuit Configuration to Decrease
Output Voltage
Output Voltage Set-Point Adjustment
(Trim)
Output voltage trim allows the user to increase or
decrease the output voltage set point of a module. This
is accomplished by connecting an external resistor
between the TRIM pin and either the SENSE(+) or
SENSE(–) pins. With an external resistor between the
TRIM and SENSE(–) pins (Radj-down), the output voltage
set point (Vo, adj) decreases (see Figure 19). The follow-
ing equation determines the required external-resistor
value to obtain a percentage output voltage change of
Δ%.
Radj-down
=
⎛
⎝
1-_{Δ---0-%--0--}
–
2_⎠⎞
kΩ
The test results for this configuration are displayed in
Figure 20. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (Radj-up), the output voltage set
point (VO, adj) increases (see Figure 21).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of Δ%.
Radj-up
=
⎛
⎝
-V----^O--1-⁽---.1-2--0--2-0--5---⁺-_Δ----%^Δ----%------⁾
–
(_{---1---0----0---Δ-}+_---%--2----Δ_----%------)⎠⎞
kΩ
1M
100k
10k
1k
100
0
10
20
30
40
% CHANGE IN OUTPUT VOLTAGE (Δ%)
8-879 (C)
Figure 20. Resistor Selection for Decreased
Output Voltage
10
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