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| 型號(hào)： | JAHW075F |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 345K |
| 代理商： | JAHW075F |
10
Lucent Technologies Inc.
Data Sheet
June 2000
dc-dc Converters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAHW050A and JAHW075A Power Modules:
Feature Descriptions
(continued)
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
adj-down
), the output voltage set point
(V
O, adj
) decreases (see Figure 17). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of
%.
The test results for this configuration are displayed in
Figure 18. This figure applies to all output voltages.
With an external resistor connected between the TRIM
and SENSE(+) pins (R
adj-up
), the output voltage set
point (V
O, adj
) increases (see Figure 19).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of
%.
1.225
%
The voltage between the V
O
(+) and V
O
(–) terminals
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.
8-748 (F).b
Figure 17. Circuit Configuration to Decrease
Output Voltage
8-3207 (F)
Figure 18. Resistor Selection for Decreased
Output Voltage
8-715 (F).b
Figure 19. Circuit Configuration to Increase
Output Voltage
R
adj-down
%
1000
11
–
k
=
R
adj-up
V
O nom
-------------------------------------100
(
1
-------
+
)
1.225
–
11
–
k
=
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-down
R
LOAD
1M
10
%
CHANGE IN OUTPUT VOLTAGE (
%
)
A
)
20
30
40
100k
10k
0
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-up
R
LOAD
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