FN409-3-02 Datasheet, PDF (3/3 Pages) List of Unclassifed Manufacturers – 75VDC input PCB fi lter

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Application
The filters are intended to be used in DC
applications per EN/IEC 60950, where no
transient on the DC bus occurs. To protect the
filter against transient voltages a varistor
(VDR, fig. 1) or a transient diode (fig. 2) must
be placed at the input side of the filter module.
For protection against overcurrent place a
fuse on each input lead (VI+, VI-). When AC
voltage is superimposed on DC voltage, VP-P
or VO-P, whichever is larger, should be
maintained within the rated voltage range.
VI1+
VI2-
Varistor
Input
+
+
Filter module
- ^{FN 409} -
Output
Chassis
ground
Figure 1: transient protection with a varistor
VO1+
VO2-
VI1+
VI2-
Transient
diode
Input
+
+
Filter module
- ^{FN 409} -
Output
Chassis
ground
Figure 2: transient protection with a transient diode
VO1+
VO2-
Recommended layout
Filter module
VI1+
VO1+
VI2-
Chassis
ground
Note: avoid routing signal tracks or planes under the filter module
VO2-
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May 2008