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IMX35 Series Data Sheet
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Inrush Current
The inrush current has been kept as low as possible by
choosing a very small input capacitance. A series resistor may
be installed in the input line in order to further reduce this
current.
35 Watt Quad-Output DC-DC Converters
Input Transient Voltage Protection
A built-in suppressor diode provides effective protection
against input transients, which may be generated for example
by short-circuits across the input lines, where the network
inductance may cause high energy pulses.
A
4
04022b
Table 4: Built-in transient voltage suppressor
Model Breakdown Peak power
voltage at 1 ms
Peak pulse
current
3
V Br nom [V]
P p [ ? ]
I pp [A]
2
1
20IMX35
40IMX35
39
100
1500
1500
22
9.7
0
20
40
60
80
t
100 μs
70IMX35
110IMX35
151
176
600
600
2.9
2.5
Fig. 2
Typical inrush current at V i nom , P o nom versus time (40IMX35).
Source impedance according to ETS 300132-2 at V i nom .
For very high energy transients as for example to achieve
IEC/EN 61000-4-5 compliance (as per table Electromagnetic
Immunity ) an external inductor and capacitor are required. The
components should have similar characteristics as listed in
V o
V o nom
t rise
04008b
table below.
Table 5: Components for external circuitry for IEC/EN
61000-4-5, level 2
Model
Inductor (L)
Capacitor (C)
Diode (D)
t startup
t
20IMX35
40IMX35
22 μH /5 A
68 μH / 2.7 A
470 μF / 40 V
2 x 100 μF /100 V
1.5 k E47A
-
Fig. 3
Converter start-up and rise time (see table 2)
Reverse Polarity Protection
70IMX35
110IMX35
100 μH / 1 A
150 μH /0.8 A
L
2 x 82 μF /200 V
2 x 82 μF / 200 V
04036a
-
-
The built-in suppressor diode also provides for reverse
polarity protection at the input by conducting current in the
reverse direction. An external fuse is required to limit this
C
+
D
Vi+
current.
Table 3: Recommended external fuses in the non-earthed
input line
Vi–
Converter model
20IMX35
40IMX35
Fuse type
F8.0 A
F4.0A
Fig. 4
Example for external circuitry to comply with IEC/EN 61000-
4-5; the diode D is only necessary for 20IMX35 models.
70IMX35
110IMX35
BCD20009-G Rev AC, 06-May-2013
F2.0A
F1.5A
Page 5 of 15
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