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參數(shù)資料
| 型號(hào)： | LS2540-7RD9TB1 |
| 元件分類(lèi)： | 電源模塊 |
| 英文描述： | 2-OUTPUT AC-DC REG PWR SUPPLY MODULE |
| 封裝： | METAL, CASE S02, MODULE |
| 文件頁(yè)數(shù)： | 19/23頁(yè) |
| 文件大?。?/td> | 526K |
| 代理商： | LS2540-7RD9TB1 |
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Rugged Environment
AC-DC Converters <100 W
S-Family
Edition 2/96 - Melcher AG
10 - 27
MELCHER
The Power Partners.
10.1
Input Fuse
A fuse mounted inside the converter protects the module
against severe defects. If operated from a DC source this
fuse may not fully protect the module when the input volt-
age exceeds 200 V DC! In applications where the convert-
ers operate at source voltages above 200 V DC an external
fuse or a circuit breaker at system level should be installed!
Table 4: Fuse Specification
Module
Fuse type
Fuse rating
LS 1
slow-blow
SPT
4 A, 250 V
1 Fuse size 5
× 20 mm
AC frequency range 47...440 Hz.
Above 70 Hz (at
Ui = 264 V AC) the earth lekage current may exceed 3.5 mA, specified in IEC 950. The built-in Y capacitors
are specified for
≤100 Hz. Above 350 Hz the input voltage may not exceed 200 V AC.
Input Under-/Overvoltage Cut-out
If the input voltage remains below approx. 0.8
Ui min or ex-
ceeds approx. 1.1
Ui max, an internally generated inhibit sig-
nal disables the output(s). When checking this function the
absolute maximum input voltage rating
U i abs should be
considered!
Input Transient Protection
A suppressor diode or a VDR (depending upon the input
voltage range) together with the input fuse and a symmetri-
cal input filter form an effective protection against high input
transient voltages.
Reverse Polarity Protection
The built-in rectifier provides reverse polarity protection at
the input.
Inrush Current Limitation
The modules of the versions -7, -6, -5 incorporate a NTC re-
sistor in the input circuitry which - at initial turn on - reduces
the peak inrush current value by a factor of 5...10 to protect
connectors and switching devices from damage. Subse-
quent switch-on cycles within short periods will cause an
increase of the peak inrush current value due to the warm-
ing-up of the NTC resistor. (see also option E)
Inrush Current Peak Value
The inrush current peak value/initial switch-on cycle) can
be determined by following calculation: (See also Input In-
rush Current Characteristic).
Ui source
Iinr p = ––––––––––––––––
(
Rs ext + Ri + RNTC)
Rs ext
Ri
RNTC
Iinr p
Ui source
+
Ci int
Fig. 4
Equivalent circuit for input impedance
Electrical Input Data
General Conditions
–
TA = 25°C, unless TC is specified.
– Pin 18 connected to pin 14,
Uo adjusted to Uo nom (option P); R input not connected.
– Sense line pins S+ and S– connected to Vo+ and Vo– respectively.
Table 3: Input data
Input
LS
Characteristics
Conditions
min
typ
max
Unit
Ui
Input voltage range
Io = 0…Io nom
85
264
V AC
TC min…TC max
88
372
V DC
Ui nom Input voltage (nominal)
310
3
Ii
Input current
Ui nom, Io nom 1
0.4
A
Pi0
No-load input power
Ui min…Ui max
2.5
W
Pi inh
Idle input power
unit inhibited
1.5
Ri
Input resistance
TC = 25
°C
480
m
RNTC
NTC resistance 2
3200
Ci
Input capacitance
210
400
F
Ui RFI
Conducted input RFI
EN 55022
B
Radiated input RFI
B
Ui abs
Input voltage limits
–400
400
V DC
(without damage)
F
Fuse rating (nominal)
4.0
A
1 With double output modules, both outputs
loaded with
Io nom
2 Valid for -7, -6, -5 versions with NTC, (-9 ver-
sions exclude the NTC). Initial switch-on cy-
cle. Subsequent switch-on/off cycles increase
the inrush current peak value.
3 LS types may also be operated in DC mode.
(See "S-Family, DC-DC Converters")
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