JFW100G1 Lineage Power, JFW100G1 Datasheet - Page 11

• Manufacturer Part Number: JFW100G1
• Manufacturer: Lineage Power

April 2008
Feature Descriptions
Remote Sense
Figure 15. Effective Circuit Configuration for
Output Voltage Set-Point Adjustment
(Trim)
Output voltage trim (V
increase or decrease the output voltage set point of a
module. This is accomplished by connecting an exter-
nal resistor between the V
SENSE(+) or SENSE(–) pins. The trim resistor should
be positioned close to the module.
If not using the trim feature, leave the V
open.
With an external resistor between the V
SENSE(–) pins (R
(V
Figure 16. Circuit Configuration to Decrease
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of ý%.
The test results for this configuration are displayed in
Figure 17. This figure applies to all output voltages.
Lineage Power
O, adj
SUPPLY
R
RESISTANCE
CONTACT
adj-down
) decreases (see Figure 16).
V
ON/OFF
CASE
V
I
I
(+)
(–)
Single-Module Remote-Sense Operation
Output Voltage
I
I
=
SENSE(+)
⎛
⎝
SENSE(–)
100
--------- - 2
Δ%
adj-down
V
V
(continued)
V
I
I
TRIM
V
(+)
(–)
O
O
(+)
O
(–)
–
SENSE(+)
SENSE(–)
TRIM pin) enables the user to
), the output voltage set point
⎞ kΩ
⎠
O
V
V
TRIM pin and either the
O
O
(+)
(–)
dc-dc Converters; 36 to 75 Vdc Input; 2.5 Vdc Output; 25 W to 75 W
(continued)
R
adj-down
CONTACT AND
DISTRIBUTION LOSSES
I
O
O
O
TRIM pin
TRIM and
R
LOAD
LOAD
8-651 (C).h
8-748 (C).c
Figure 17. Resistor Selection for Decreased
With an external resistor connected between the
V
age set point (V
Figure 18. Circuit Configuration to Increase
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of ý%.
The test results for this configuration are displayed in
Figure 19.
The voltage between the V
must not exceed the output overvoltage shutdown volt-
age. This limit includes any increase in voltage due to
remote-sense compensation and output voltage set-
point adjustment (trim).
O
TRIM and SENSE(+) pins (R
R
100k
adj-up
10k
100
V
ON/OFF
CASE
V
1k
I
I
(+)
(–)
0
=
Output Voltage
Output Voltage
⎛
⎝
V
------------------------------------- -
SENSE(+)
% CHANGE IN OUTPUT VOLTAGE (Δ%)
SENSE(–)
O
1.225 Δ%
O, adj
V
(
O
100
10
V
TRIM
V
O
O
) increases (see Figure 18).
(+)
(–)
•
+
Δ%
O
)
(+) and V
–
20
(
-------------------------------------- -
adj-up
100
R
adj-up
), the output volt-
+
Δ%
O
2 Δ%
(–) terminals
•
30
R
)
LOAD
⎞ kΩ
⎠
8-715 (C).g
8-2460 (C)
40
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