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參數(shù)資料
| 型號(hào)： | LW020F73 |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 20 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁(yè)數(shù)： | 2/16頁(yè) |
| 文件大?。?/td> | 341K |
| 代理商： | LW020F73 |
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10
Lucent Technologies Inc.
Data Sheet
January 2000
36 Vdc to 75 Vdc Inputs; 20 W
LW020 Single-Output-Series Power Modules:
Feature Descriptions (continued)
Remote On/Off (continued)
The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not generally
needed and may degrade the start-up characteristics of the module.
8-758(C).a
Figure 14. Remote On/Off Implementation
Output Voltage Adjustment
Output voltage trim allows the user to increase or decrease the output voltage set point of a module. This is accom-
plished by connecting an external resistor between the TRIM pin and either the VO(+) or VO(–) pins. With an exter-
nal resistor between the TRIM and VO(+) pins (Radj-down), the output voltage set point (VO, adj) decreases. With an
external resistor between the TRIM pin and VO(–) pin (Radj-up), VO, adj increases.
The following equations determine the required external resistor value to obtain an output voltage change of
%:
The adjusted output voltage cannot exceed 110% of the nominal output voltage between the VO(+) and VO(–) termi-
nal.
The modules have a xed current-limit set point. Therefore, as the output voltage is adjusted down, the available
output power is reduced. In addition, the minimum output current is a function of the output voltage. As the output
voltage is adjusted down, the minimum required output current can increase.
Device
abcd
–5% VO Radj-down
+5% VO Radj-up
LW020G
14.0
51.10
7.02
2.0
75.3 k
88.9 k
LW020F
14.0
51.10
5.19
2.70
110.9 k
52.8 k
LW020A
4.02
16.90
2.01
2.0
19.3 k
23.3 k
LW020B
15.40
1.58
9.80
246.5 k
16.0 k
LW020C
21.50
16.90
1.76
12.24
356.3 k
18.2 k
+
Ion/off
–
Von/off
REMOTE
ON/OFF
VI(+)
VI(–)
Radj-down
cd
1
%
–
() 1
–
[]
%
----------------------------------------------------
b
–
k
=
Radj-up
a
d
%
-------------------
b
–
k
=
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