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40IMX7-05-05-8 Datasheet(PDF) 6 Page - Bel Fuse Inc.

Part # 40IMX7-05-05-8
Description  7-Watt DC-DC Converters
Download  14 Pages
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Manufacturer  BEL [Bel Fuse Inc.]
Direct Link  http://www.belfuse.com
Logo BEL - Bel Fuse Inc.

40IMX7-05-05-8 Datasheet(HTML) 6 Page - Bel Fuse Inc.

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IMX7, IMS7 Series Data Sheet
7-Watt DC-DC Converters
BCD20007-G Rev AF, 31-Jul-2015
Page 6 of 14
MELCHER
The Power Partners.
Input Transient Voltage Protection
In many applications transient voltages on the input of the
converter may occur and are possibly caused by short circuits
between Vi+
and Vi–, where the network inductance may
cause high energy pulses.
In order to protect the converters, transient suppressors are
fitted to the input; see table below:
Table 3: Built-in transient voltage suppressor
Model
Breakdown
Peak Power
Peak Pulse
Voltage
at 1 ms
Current
VBR nom
P P
IPP
20IMX7 1
overvoltage lockout at approx. 38 V
24IMS7 2
53 V
600 W
7.7 A
40IMX7 2
100 V
1500 W
11 A
48IMS7 2
100 V
600 W
4.1 A
70IMX7 2
144 V
600 W
2.9 A
110IMX7 2
167 V
600 W
2.5 A
1 The built-in overvoltage trigger shuts down the converter at
approx. 38 V protecting the input up to 50 V. For higher transient
voltages an external suppressor or voltage limiting circuit as, e.g.,
for IEC/EN 61000-4-5, level 2 compliance should be provided.
2 If transients generating currents above the peak pulse current are
possible, an external limiting network such as the circuit
recommended for IEC/EN 61000-4-5, level 2 compliance, is
necessary.
To achieve IEC/EN 61000-4-5, level 2 compliance, an
additional inductor and capacitor should be provided externally
as shown in the figure below. The components should have
similar characteristics as listed in table 4.
Input Fuse and Reverse Polarity Protection
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse
direction, thus protecting the converter. An external fuse is
required to limit this current. We recommend for:
– 20IMX7 and 24IMS7 a fast 2 A (F2A) fuse
– 40IMX7 and 48IMS7 a fast 1 A (F1A) fuse
– 70IMX7 a fast 0.63 A (F.63A) fuse
– 110IMX7 a fast 0.63 A (F.63A) fuse.
Inrush Current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor may
be inserted in the input line to limit this current further.
Fig. 5
Typical inrush current at Vi nom , Po nom measured according to
ETS 300132-2 (40IMX7).
0
1
2
3
A
0
20
40
60
80 µs
04030a
4
Table 4: Components for external circuitry to comply with
IEC/EN 61000-4-5, see table 8
Model
L
C
D
20IMX7
330 µH, 1 A, 0.115
68 µF, 63 V
1.5KE39A
24IMS7
40IMX7
330 µH, 0.6 A, 0.42
47 µF, 100 V
1.5KE100A
48IMS7
70IMX7
1000 µ H, 0.6 A, 0.42
22 µF, 160 V
1.5KE120A
110IMX7
330 µH, 0.2 A
22 µF, 200 V
1.5KE170A
Note: Suppressor diode D is only necessary for 20IMX7 models.
To withstand 150 V transients according to 19 Pfl 1, applicable for
40IMX7
models,
the
same
external
circuitry
with
similar
components as for IEC/EN 61000-4-5, level 2 compliance can be
used.
Fig. 4
Example for external circuitry to comply with IEC/EN
61000-4-5, level 2 (transzorb D only for 20IMX7).
Vi+
Vi–
07064
C
L
D
+
i


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