參數(shù)資料
型號: LW025A
英文描述: LW025 Single-Output-Series Power Modules 36 Vdc to 75 Vdc Inputs 25 W
中文描述: LW025單輸出系列電源模塊36伏到75伏直流電輸入25瓦
文件頁數(shù): 9/16頁
文件大小: 477K
代理商: LW025A
Tyco Electronics Corp.
9
Advance Data Sheet
March 1999
36 Vdc to 75 Vdc Inputs; 25 W
LW025 Single-Output-Series Power Modules:
Feature Descriptions
(continued)
Remote On/Off
(continued)
8-758(C).a
Figure 13. 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 V
O
(+) or V
O
(–) pins. With an exter-
nal resistor between the TRIM and V
O
(+) pins (R
adj-down
), the output voltage set point (V
O, adj
) decreases. With an
external resistor between the TRIM pin and V
O
(–) pin (R
adj-up
), V
O, adj
increases.
The following equations determine the required external resistor value to obtain an output voltage change of y%:
The adjusted output voltage cannot exceed 110% of the nominal output voltage between the V
O
(+) and V
O
(–) ter-
minal.
The modules have a fixed 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.
Output Overvoltage Protection
The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that monitors
the voltage on the output terminals. The control loop of the protection circuit has a higher voltage set point than the
primary loop (see Feature Specifications table). In a fault condition, the overvoltage clamp ensures that the output
voltage does not exceed V
O, clamp, max
. This provides a redundant voltage-control that reduces the risk of output
overvoltage.
Device
LW025F
LW025A
a
b
c
d
–5% V
O
R
adj-down
111.7 k
19.3 k
+5% V
O
R
adj-up
52.7 k
23.3 k
14.0
4.02
51.1
16.9
5.2
2.01
2.7
2.0
+
I
on/off
-
V
on/off
REMOTE
ON/OFF
V
I
(+)
V
I
(-)
R
adj-down
c d
1
%
%
(
)
1
]
b
k
=
R
adj-up
d
%
-------a
b
k
=
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