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20IMX4-12-8 Datasheet(PDF) 5 Page - Bel Fuse Inc.

Part # 20IMX4-12-8
Description  4 Watt DC-DC Converters
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Manufacturer  BEL [Bel Fuse Inc.]
Direct Link  http://www.belfuse.com
Logo BEL - Bel Fuse Inc.

20IMX4-12-8 Datasheet(HTML) 5 Page - Bel Fuse Inc.

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IMX4 Series Data Sheet
4 Watt DC-DC Converters
BCD20006-G Rev AE, 16-Sep-2015
Page 5 of 12
MELCHER
The Power Partners.
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.
In order to protect the converter, a transient voltage sup-
pressor diode is fitted at the input; see table below.
Table 4: Built-in transient voltage suppressor
Model
Breakdown
Peak power
Peak pulse
voltage
at 1 ms
current
VBR nom
PP
IPP
5IMX4
--
--
--
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
I PP 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 comp
onents are specified in table 5.
If 40IMX4 converters should withstand 150 V transients
according to 19Pfl1, the same external circuitry with similar
components as shown in figure 8 can be used.
Fuse and Reverse Polarity Protection
The suppressor diode on the input also protects against
reverse polarity input voltage. An external fast fuse is required
to limit this reverse current; see table below.
Table 6: External input fuse
Model
Fuse type
5IMX4
Fast 1.6 A
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 µH, 0.42 W
330 µH, 0.42 W
330 µH, 0.65 W
1 A
0.6 A
0.3 A
Ci
68 µF, 50 V
68 µF, 100 V
100 µF, 200 V
D
ON 1.5KE 39 A
ON 1.5KE 82 A


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