Industrial Environment
DC/DC Converters < 40W
IMS6 Series
U
o
U
o nom
04008
Reverse Polarity Protection at Input
The suppressor diode on the input also provides for reverse
polarity protection by conducting current in the reverse di-
rection, thus protecting the unit. An external fuse is required
to limit this current:
t
rise
t
t
start up
– For 24 IMS 6 a fast 0.63 A (F0.63A) fuse is recommended
– For 48 IMS 6 a fast 0.35 A (F035A) fuse is recommended
Filter recommendations for compliance with EN 55022
Electromagnetic emission requirements according to table
Input data
can be achieved by adding an external capacitor
as close as possible to the input terminals.
04035
Fig. 7
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 limit this current further.
1 A/Div.
4
3
2
1
0
04034
Vi+
C
i
Vi–
Fig. 9
Input filter arrangement
Table 3: Input filter components (EN 55022)
Ref.
C
1
5 s/Div.
Type
24 IMS 6
2.2
,
F
,
100 V,
48 IMS 6
2.2 F
,
150 V,
ceramic or film
Fig. 8
Typical inrush current at U
i nom
, P
o nom
versus time
(48 IMS6 ) measured according to prETS 300132-2,
version 4.3.
Edition 1 06.00
POWER-ONE [ POWER-ONE ]
