JC050C1 Datasheet, PDF (9/16 Pages) Lineage Power Corporation – Distributed power architectures

Data Sheet
March 2008
JC050C, JC075C, JC100C Power Modules: dc-dc Converters;
18 Vdc to 36 Vdc Input, 15 Vdc Output; 50 W to 100 W
Feature descriptions (continued)
Remote Sense (continued)
SENSE(+)
SENSE(–)
SUPPLY _II
CONTACT
RESISTANCE
VI(+)
VI(–)
VO(+)
VO(–)
IO
LOAD
CONTACT AND
DISTRIBUTION LOSSES
8-651 (C).h
Figure 15. Effective Circuit Configuration for
Single-Module Remote-Sense Operation
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 16). 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 17. 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 18).
Note: The output voltage of this module may be increased to a maxi-
mum of 0.5 V. The 0.5 V is the combination of both the remote-
sense and the output voltage set-point adjustment (trim). Do
not exceed 15.5 V between the VO(+) and VO(–) terminals.
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
Only trim up to 0.5 V maximum. See note above.
The test results for this configuration are displayed in
Figure 17. For applications requiring voltage between
15 V and 24 V, consider using the JC050H, JC075H,
JC100H (24 V) trimmed down.
The voltage between the VO(+) and VO(–) terminals
must not exceed 16.5 V. This limit includes any
increase in voltage due to remote-sense compensation
and output voltage set-point adjustment (trim). See
Figure 15.
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 16. Circuit Configuration to Decrease
Output Voltage
100 k
10 k
1k
100
10
1
0
10
20
30
40
50
% CHANGE IN OUTPUT VOLTAGE
8-1237 (C).a
Figure 17. Resistor Selection for Decreased
Output Voltage
Lineage Power
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