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An electro-magnetic interference filter (EMC filter) that meets the standard defined by the EN-55022 certification would consist on a big common mode choke, several capacitors on the input side and two more capacitors across input and output. If this has to be done externally, the board space needed will be significantly larger, the bill of materials will increase and the overall costs will also increase. A good internal layout and selection of components will make it possible to built-in this filter in the converter.
PTM Published on: 2011-11-03