20IMX4-03-8 データシートの表示（PDF） - Bel Fuse Inc.
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20IMX4-03-8 Datasheet PDF : 12 Pages
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IMX4 Series Data Sheet
4 Watt DC-DC Converters
Electrical Input Data
General conditions: TA = 25 °C, unless TC is specified.
Table 2: Input Data
Input
5IMX4
20IMX4
40IMX4
70IMX4
Characteristics
Conditions
min typ max min typ max min typ max min typ max
Vi
Input voltage range
Vi nom Nominal input voltage
TC min to TC max
Io = 0 to Io nom
4.7 5.0 16.8 8.4
36 16.8 2
75 40
121
5.0
20
40
70
Vi sur Repetitive surge voltage abs. max input (3 s)
tstart-up Converter start-up time1 Worst case condition at
Vi min and full load
trise Rise time 1
Vi nom
Io nom
resistive load
capacitive load
--
0.25 0.5
--
--
40
0.25 0.5
5
12
100
0.25 0.5
5
12
150
0.3 0.6
5
12
Unit
VDC
s
ms
Ii o
No-load input current Io = 0, Vi min to Vi max
--
15 20
5 10
5 10 mA
C i Input capacitance
--
0.54
0.3
0.15
µF
Iinr p Inrush peak current
Vi = Vi nom 3
3.8
3.7
4.2
5.6
A
fs
Switching frequency
Vi min to Vi max, Io = 0 to Io nom
400
400
400
40 0
kHz
Ii rr Reflected ripple current Io = 0 to Io nom
--
100
60
30 mApp
vi RFI Input RFI level
conducted
EN 55011/55022 4
--
A
A
A
Class
1 Measured with a resistive or max. admissible capacitive load; see fig. 5
2 Operation at lower input voltage possible: Po approx. 80% of Po nom at Vi min = 14.4 V
3 Source impedance according to ETS 300132-2, version 4.3.
4 External capacitors required according to table 3.
Start-up
Vo
Vo nom
trise
04008b
Fig. 5
tstartup
t
Converter start-up and rise time
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 further limit this current.
A
04034a
3
2
Filter to Comply with EN 55011/55022
Electromagnetic emission requirements according to table
Electrical Input Data can be achieved by adding an external
capacitor as close as possible to the input terminals (see fig. 7
and table 3).
04035b
Vi+
+ Ci
Fig. 7
Vi–
Input capacitors
Table 3: Input electrolytic capacitors
Model
Ci
20IMX4
100 µF
50 V
40IMX4
47 µF
100 V
70IMX4
330 µF
200 V
1
0
Fig. 6
0
10
20
30
40 µs
Typ. inrush current at Vi nom, Po nom versus time measured
according to ETS 300132-2, version 4.3 (40IMX4).
BCD20006-G Rev AE, 16-Sep-2015
MELCHER
The Power Partners.
Page 4 of 12
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