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| 型号： | 20IMX4-15-8K-G |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 4.2 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | 8.5 MM, DIP-24 |
| 文件页数： | 8/12页 |
| 文件大小： | 622K |
| 代理商： | 20IMX4-15-8K-G |
NOV 18, 2004 revised to OCT 12, 2006
Page 5 of 12
www.power-one.com
IMX4 DC-DC Series Data Sheet
4-Watt DC-DC Converters
Input Transient Voltage Protection
In many applications transient voltages on the converter input
are always possible. These may be caused for example by
short circuits between Vi+ and Vi–, where the network
inductance may generate high energy pulses.
To protect the converter a large transient voltage suppressor is
fitted to the input, see table below.
Table 4: Built-in transient voltage suppressor
Type
Breakdown
Peak power
Peak pulse
voltage
at 1 ms
current
VBR nom
PP
IPP
20IMX4
40 V
600 W
10.3 A
40IMX4
100 V
600 W
4.1 A
70IMX4
150 V
600 W
2.9 A
Fig. 8
External circuitry to comply with
IEC/EN 61000-4-5, level 2.
Vi+
Vi–
Ci
Li
D
+
04036b
If transients generating currents above the peak pulse current
IPP are possible, an external limiting network such as the circuit
shown in figure 8 is recommended. It provides compliance with
transients according to IEC/EN 61000-4-5, level 2. The compo-
nents are specified in table 5.
If 40IMX4 models should withstand 150 V transients according
to 19Pfl1, the same external circuitry with similar components
shown in figure 8 can be used.
Fuse and Reverse Polarity Protection
A suppressor diode on the input also protects against reverse
polarity input voltage. An external fast fuse is required to limit
this reverse current:
Table 6: External input fuse
Model
Fuse type
20IMX4
Fast 1 A
40IMX4
Fast 0.5 A
70IMX4
Fast 0.315 A
Table 5: Components for the circuitry fig. 8
Model
20IMX4
40IMX4
70IMX4
Li
330
H, 0.42
330
H, 0.42
330
H, 0.65
1 A
0.6 A
0.3 A
Ci
68
F, 50 V
68
F, 100 V
100
F, 200 V
D
ON 1.5KE 39 A
ON 1.5KE 82 A
–
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