JAHW075A Lineage Power, JAHW075A Datasheet - Page 12

• Manufacturer Part Number: JAHW075A
• Manufacturer: Lineage Power

dc-dc Converters; 36 to 75 Vdc Input, 5 Vdc Output; 50 to 100 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 resistor should be positioned close to the mod-
ule.
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 Δ%.
The test results for this configuration are displayed in
Figure 25. 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 Δ%.
The voltage between the V
must not exceed the minimum output overvoltage shut-
down value indicated in the Feature Specifications
table. This limit includes any increase in voltage due to
remote-sense compensation and output voltage set-
point adjustment (trim).
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.
12
12
R
O, adj
adj-up
R
adj-down
) decreases (see Figure 24). The following equa-
O, adj
=
⎛
⎜
⎜
⎝
(
------------------------------------------------------------------------- - 1000
V
) increases (see Figure 26).
=
O nom
,
⎛
⎝
1000
------------ - 11
adj-down
Δ%
)
(
1.225Δ%
1
–
adj-up
+
), the output voltage set point
------- -
100
Δ%
⎞ kΩ
⎠
O
), the output voltage set
(+) and V
)
(continued)
–
1.225
O
(–) terminals
–
11
⎞
⎟
⎟
⎠
kΩ
Figure 24. Circuit Configuration to Decrease
Figure 25. Resistor Selection for Decreased
Figure 26. Circuit Configuration to Increase
100k
10k
1M
V
ON/OFF
CASE
V
V
ON/OFF
CASE
V
I
I
I
I
(+)
(–)
(+)
(–)
0
Output Voltage
Output Voltage
Output Voltage
% CHANGE IN OUTPUT VOLTAGE (Δ%)
SENSE(+)
SENSE(–)
SENSE(+)
SENSE(–)
10
V
TRIM
V
V
TRIM
V
O
O
O
O
(+)
(+)
(–)
(–)
20
R
R
adj-up
adj-down
Lineage Power
30
April 2008
R
R
LOAD
LOAD
8-748 (F).b
8-715 (F).b
8-3207 (F)
40