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参数资料
| 型号： | LS2540-9RD1TB1 |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT AC-DC REG PWR SUPPLY MODULE |
| 封装： | METAL, CASE S02, MODULE |
| 文件页数： | 7/23页 |
| 文件大小： | 526K |
| 代理商： | LS2540-9RD1TB1 |
Rugged Environment
AC-DC Converters <100 W
S-Family
Edition 2/96 - Melcher AG
10 - 37
MELCHER
The Power Partners.
10.1
Option E Inrush Current Limitation
The converters may be supplemented by an electronic cir-
cuit (option E, replacing the standard built-in NTC) to
achieve an enhanced inrush current limiting function.
Input
Filter
Control
Converter
FET
Ci
RI
RS
Rectifier
Table 12: Inrush current characteristics with option E
Characteristics
LS
Unit
Ui = 230 V AC
typ
max
Iinr p
Peak inrush current
–
25.3
A
t inr
Inrush current duration
35
50
ms
15
Ii [A]
10
5
0
–5
–10
–15
0
20
40
60
80
t [ms]
tinr
LS type
Ui = 230 V AC
Po = Po nom
Capacitor
Ci
fully charged
Normal operation
(FET fully conducting)
20
Fig. 20
Inrush current with option E
Precaution:
Subsequent switch-on cycles at start-up are limited to
max. 10 cycles during the first 20 seconds (cold unit)
and at continuing on/off (
TC =95°C) max. 1 cycle every
8 sec.
Fig. 19
Option E block diagram
Option P Potentiometer
The potentiometer provides an output voltage adjustment
range of +10/–60% of
Uo nom and is accessible through a
hole in the front cover. This feature enables compensation
for voltage drops across the connector and wiring. Option P
is not recommended if units are connected in parallel.
Option P excludes the R-function. With double output units
both outputs are affected by the potentiometer setting (dou-
bling the voltage setting if the outputs are in series).
If the output voltages are increased above
Uo nom via R-in-
put control, option P setting, remote sensing or option T, the
output current(s) should be reduced accordingly so that
Po nom is not exceeded.
Vo+
Vo–
Vo+
Vo–
Load
Vo+
Vo–
Fig. 21
An example of poor wiring for connection in parallel
Option T Current Sharing
This option ensures that the output currents are approxi-
mately shared between all paralleled modules and in-
creases system reliability. To use this facility, simply inter-
connect the T pins of all modules and make sure, that pins
no. 14, the S– pins (S 1000) or the Vo1– pins (S 2000) are
also connected together. The load leads should have equal
length and cross section to ensure equal voltage drops. Not
more than 5 units should be connected in parallel. If output
voltage adjustment is requested we strongly recommend to
use the R-input instead of option P, as with option P the re-
quired setting accuracy is difficult to achieve. The output
voltages must be individually set prior to paralleling to
within a tolerance of 1...2% or the R pins should be con-
nected together.
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