JW075M1 Lineage Power, JW075M1 Datasheet - Page 8

• Manufacturer Part Number: JW075M1
• Manufacturer: Lineage Power

dc-dc Converters; 36 to 75 Vdc Input, 1.5 Vdc Output; 15 W to 45 W
Feature Descriptions
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. The trim resistors should be positioned
close to the module.
If not using the trim feature, leave the TRIM pin open.
With an external resistor between the TRIM and
SENSE(–) pins (R
(V
tion determines the required external-resistor value to
obtain a percentage output voltage change of ý%.
The test results for this configuration are displayed in
Figure 11. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (R
point (V
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 11.
The voltage between the V
must not exceed 1.8 V. This limit includes any increase
in voltage due to remote-sense compensation and out-
put voltage set-point adjustment (trim). See Figure 9.
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.
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 8
O, adj
R
R
adj-down
adj-up
) decreases (see Figure 9). The following equa-
O, adj
=
) increases (see Figure 12).
=
⎛
⎝
------------------------------------- -
V
⎛
⎝
O
100
--------- - 2
Δ%
1.225Δ%
(
adj-down
100
–
adj-up
+
⎞ kΩ
⎠
), the output voltage set point
Δ%
O
), the output voltage set
(+) and V
)
(continued)
–
(
--------------------------------- -
100
Δ%
+
O
(–) terminals
2Δ%
)
⎞ kΩ
⎠
Figure 10. Circuit Configuration to Decrease
Figure 11. Resistor Selection for Decreased
Figure 12. Circuit Configuration to Increase
100k
100
10k
V
ON/OFF
CASE
V
1k
I
I
(+)
(–)
0
Output Voltage
Output Voltage
Output Voltage
V
ON/OFF
CASE
V
% CHANGE IN OUTPUT VOLTAGE (•%)
SENSE(+)
I
I
SENSE (–)
(+)
(–)
8.25
V
TRIM
V
O
O
(+)
SENSE(+)
SENSE(–)
( –)
V
TRIM
V
O
O
(+)
(–)
16.5
R
R
adj-down
adj-up
24.75
Lineage Power
April 2008
R
LOAD
R
LOAD
8-748 (C).b
8-715 (C).b
8-2116 (C)
33