DSS6NB32A471Q55B Datasheet, PDF (31/40 Pages) Murata Manufacturing Co., Ltd. – EMI Suppression Filters (Lead Type EMIFIL)

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Noise Suppression Effect of VFR/VFS Series
Continued from the preceding page.
2. Absorption of wide-pulse noise (50ns/div, 200V/div)
Type of Filter
EMI Suppression Effect
Description
200ns
Without Filters
Two-terminal capacitor
Noise wave applied
100
90
80
20
10
0%
In capacitors the voltage of the residual
surge (1300V) is higher than that of the
above example. The wave height is
almost the same as the original.
Three-terminal capacitor
100
(with ferrite bead)
90
80
20
10
0%
Conventional EMI filters do not work for
wide-pulse noise because the
capacitors are saturated. In this
example, the residual 1200V surge can
cause the system to break down.
VFS9V
100
90
80
20
10
0%
Bypassing the high voltage to the
ground suppresses the voltage.
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