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參數(shù)資料
| 型號： | LT1840-7Z |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 500 W AC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 28/32頁 |
| 文件大?。?/td> | 1000K |
| 代理商： | LT1840-7Z |
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BCD20023 Rev. AA, 3-Sep-2008
Page 5 of 32
www.power-one.com
T Series Data Sheet
500 Watt AC-DC Converters
0246
8
10
12
14
16
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
0.98
1.00
PF
Io [A]
UT1740-7Z at Vi = 110 VAC
LT1740-7Z at Vi = 230 VAC
04023a
Table 3: Fuse Type
Series
Schurter type
Part number
LT
SPF 6.3 A, 250 V
0001.1012
UT
SPT 10 A, 250 V
0001.2514
Input Fuse
An input fuse (5
× 20 mm) in series with the input line (L)
inside the converter protects against severe defects; see also
Safety and Installation Instructions. For applications with
accessible fuse, see Option F.
Fig. 3
Harmonic distortion at input LT1740-7Z, Vi = Vinom, Io = Io nom
Fig. 4
Harmonic distortion at input UT1740-7Z, Vi = Vinom, Io = Io nom
Inrush Current
The converters exhibit an input capacitance of only 4 F,
resulting in a low and short peak current, when the converter
is connected to the mains. During switch-on, the converter
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 procedure of the output capacitors, the
converter can be hot swapped. The LT inrush current is a
factor 10 smaller than defined in the ETS 300132-1 standard
for Telecom systems. However the converter should be
plugged-in smoothly, giving time to the output capacitors to be
charged.
Input Under- /Overvoltage Lockout
If the specified input voltage range Vi is exceeded, the
converter stops operation temporarily resulting in reduced
output power and increased RFI. The input is protected by
varistors. Continuous overvoltage will destroy the converter.
If the sinusoidal input voltage stays below the input under-
voltage lockout threshold Vi, the converter will be inhibited.
Power Factor, Harmonics
Power factor correction PFC is achieved by controlling the
input current waveform synchronously with the input voltage.
Fig. 2
Power factor
Fig. 5
Efficiency versus load of LT1701
3
5
7
9
11
13
17
Harm.
15
3.0
2.5
2.0
1.5
1.0
0.5
0
mA/W
3.5
04026a
Limit class D according
to IEC/EN 61000-3-2
3
5
7
9
11
13
17
Harm.
15
3.0
2.5
2.0
1.5
1.0
0.5
0
mA/W
3.5
04025a
Limit class D according
to IEC/EN 61000-3-2
02
4
6
8
10
12
14
16
0.82
0.84
0.86
0.88
0.90
0.92
0.94
0.96
Io [A]
Vi = 110 VAC
U i = 230 VAC
04024a
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