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Tips for cutting EMI in DC/DC converters

Posted: 14 Sep 2012 ?? ?Print Version ?Bookmark and Share

Keywords:Electromagnetic interference? EN55022? FCC?

Electromagnetic interference (EMI) is the disruption of proper operation of an electronic device, brought about by an electromagnetic field generated by a different device. To prevent electronics from interfering with the operation of other devices, EMI is regulated by the government where the electronic device is being sold. In Europe, there are the European norms (EN55022 etc.), in the USA there is FCC part 15, in Canada there is ICES-003, in Japan there is VCCI, in China there is... Well, you get the picture. EMI is difficult to accurately predict, so the best thing you can do is to minimize the known causes of EMI when planning your layout and design. This application note will explore how the layout of your DC/DC power supply can significantly affect the amount of EMI that it produces. We will look at several variations of a layout, analyze the results, and provide answers to some common EMI questions such whether or not to use a shielded inductor.

View the PDF document for more information.

Originally published by Texas Instruments at as "Layout Tips for EMI Reduction in DC / DC Converters".

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