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+ Typical Input Filter Configurations

10uf (1)
These filtering configurations will minimize the
to amount of switching ripple reflected on the DC
IN
200uf input.

- The specific component values required depend on
the input current and the impedance of the input
voltage source.

These filtering configurations will minimize the
+ amount of switching ripple reflected on the DC
(2) input.
10uf 0.01uf
to to IN Figure (1) is the least effective, but is generally
200uf 0.1uf adequate in most switching systems.

- Figure (2) provides a 50% reduction in higher
frequency components of the input ripple.

Figure (3) provides adequate input filtering for
analog systems.
0.1 to 1mh
+ Figure (4) provides a 50% reduction in input
(3) ripple amplitude compared with figure (3).
10uf
to IN
200uf

-




0.1 to 1mh
+
(4)
0.01uf 10uf
to to IN
0.1uf 200uf

-