參數(shù)資料
型號(hào): JAW050A1
英文描述: Analog IC
中文描述: 模擬IC
文件頁(yè)數(shù): 9/16頁(yè)
文件大小: 359K
代理商: JAW050A1
Lucent Technologies Inc.
9
Advance Data Sheet
May 1999
dc-dc Converters; 36 Vdc to 75 Vdc Input, 5 Vdc Output; 50 W to 75 W
JAW050A and JAW075A 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 module.
If not using the trim feature, leave the TRIM pin open.
With an external resistor between the TRIM and
SENSE(–) pins (R
adj-down
(V
O, adj
) decreases (see Figure 14). The following equa-
tion determines the required external-resistor value to
obtain a percentage output voltage change of
), the output voltage set point
%.
The test results for this configuration are displayed in
Figure 15. 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 16).
The following equation determines the required exter-
nal-resistor value to obtain a percentage output voltage
change of
%.
The test results for this configuration are displayed in
Figure 17.
The voltage between the V
must not exceed the minimum output overvoltage pro-
tection voltage as indicated in the Feature Specifica-
tions table. This limit includes any increase in voltage
due to remote-sense compensation and output voltage
set-point adjustment (trim). See Figure 13.
O
(+) and V
O
(–) terminals
8-748(C).b
Figure 14. Circuit Configuration to Decrease
Output Voltage
8-1783(C)
Figure 15. Resistor Selection for Decreased
Output Voltage
8-715(C).b
Figure 16. Circuit Configuration to Increase
Output Voltage
8-1784(C)
Figure 17. Resistor Selection for Increased Output
Voltage
R
adj-down
%
1000
11
k
=
R
adj-up
V
O nom
-------------------------------------100
(
)
1
(
1.225
%
%
)
1.225
11
k
=
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-down
R
LOAD
0
10
20
30
40
10M
PERCENT CHANGE IN OUTPUT VOLTAGE (
%)
A
)
1M
100k
10k
V
I
(+)
V
I
(–)
ON/OFF
CASE
V
O
(+)
V
O
(–)
SENSE(+)
TRIM
SENSE(–)
R
adj-up
R
LOAD
1
2
9
10
100M
PERCENT CHANGE IN OUTPUT VOLTAGE (
%)
A
)
10M
1M
100k
3
4
5
6
7
8
0
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