參數(shù)資料
型號(hào)： LT1740-7
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT 550 W AC-DC REG PWR SUPPLY MODULE
封裝： CASE T01, MODULE
文件頁(yè)數(shù)： 30/33頁(yè)
文件大?。?/td> 838K
代理商： LT1740-7
T Series
AC-DC Converters >100 Watt
Rugged Environment
Edition 4/4.99
6/33
MELCHER
The Power Partners.
Inrush Current
The T units operate with 4
F input capacitance resulting in
a low peak current of short duration when the unit is con-
nected to the mains. During switch on the input current can
rise up to the input current limit
Ii L. As a direct result of the
low and short inrush current and controlled charging proce-
dure of the output capacitors, the unit can be hot plugged to
the mains causing only negligible disturbances. The LT in-
rush current is a factor 10 smaller than defined in the ETS
300 132-1 standard for Telecom Systems. However the unit
should be plugged-in smoothly giving time to the output ca-
pacitors to be charged.
Input Under-/Overvoltage Lock-Out
If the specified input voltage range
Ui is exceeded, the unit
stops operation temporarily resulting in reduced output
power and increased RFI. The input is protected by
varistors. Continuous overvoltage will destroy the unit.
If the sinusoidal input voltage stays below the input under-
voltage lock-out threshold
Ui, the unit will be inhibited.
Power Factor, Harmonics
Power factor correction is achieved by controlling the input
current waveform synchronously with the input voltage
waveform. The power factor control is active in all operating
conditions (voltage regulation, output power limitation, cur-
rent limitation). The power factor control also works with dif-
ferent input voltage waveforms and frequencies. Operation
at frequencies above 60 Hz will result in higher leakage cur-
rents. For special applications with different frequencies or
non-sinusoidal wave forms, please contact Melcher.
Input Fuse
An input fuse (5
× 20 mm) fitted in the line (P) path mounted
inside the converter protects the module against severe
defects. (See also:
Safety and Installation Instructions.) For
applications where the fuse should be accessible: see
Op-
tion F.
0246
8
10
12
14
16
0.80
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
0.98
1.00
PF
Io [A]
UT 1740-7Z at Ui = 110 Vrms
LT 1740-7Z at Ui = 230 Vrms
04023
0
2
4
6
8
101214
16
0.80
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
Eff.
Io [A]
U i = 110 Vrms
U i = 230 Vrms
04024
Efficiency
The extremely high efficiency of the T series is achieved by
using a single step power factor corrected converter topo-
logy together with the most advanced technology in power
conversion.
It allows a very compact design in a fully enclosed case
without forced cooling.
3
5
7
9
11
13
17
19
15
Harm.
3.0
2.5
2.0
1.5
1.0
0.5
0
I i [mA/W]
3.5
04025
Limit class D according
to IEC/EN 61000-3-2
3
5
7
9
11
13
17
19
15
Harm.
3.0
2.5
2.0
1.5
1.0
0.5
0
Ii [mA/W]
3.5
04026
Limit class D according
to IEC/EN 61000-3-2
Fig. 3
Efficiency versus load of LT 1701
Fig. 4
Harmonic distortion at input LT 1740-7Z, Ui = Uinom,
Io = Io nom
Fig. 2
Power factor
Fig. 5
Harmonic distortion at input UT 1740-7Z, Ui = Uinom,
Io = Io nom
Table 3: Fuse Type
Series
Schurter type
Part number
LT
SP F 6.3 A, 250 V
0001.1012
UT
SPT 10 A, 250 V
0001.2514
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