Power & Power ICs

Application Note

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Dealing With Noise Generated by a DC/DC Converter

All DC/DC converters generate unwanted high-frequency noise during the conversion process. Over the years, designers have used different designs and topologies to minimize and/or eliminate the noise in DC/DC converters.

Independent of the design or topology used, cost and performance usually track each other. Cost-reduction efforts have influenced the industry up to the point that IC and converter manufacturers design application-specific products to minimize their cost. The most commonly used noise-reduction component is a low-pass filter at the output and/or input.

Noise in DC/DC converters is known as "conducted noise" or "radiated noise." Conducted noise is the noise observed on the conductors that connect the converters to an input power source, a load, or any other control signal. Radiated noise is the same as conducted noise, but is radiated to the surrounding space either through the same connecting conductors or from the internal components as a result of switching voltage/current and magnetic flux, which are present if no electromagnetic shield is used.

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