Cirrus Logic Inc.

Alban Shemsedini

Siddharth Maru

Bryan W McCoy

A method implemented by a control circuit reduces electromagnetic interference (EMI) generation in a switched-mode power supply. The power supply adjusts operating frequency in response to a change in operating condition, and the method avoids certain bands of frequencies, for which switching should be avoided to avoid generating EMI in the band(s). The method includes determining a disallowed cycle time period range corresponding to the band(s) of frequencies by detecting that a switching event for the adjusted operating frequency would cause a switching cycle period to be within the disallowed time period range, and in response, preventing switching of the switched-mode power supply that would cause an end of a switching cycle to occur within the disallowed cycle time period range, and permitting switching of the switched-mode power supply that would cause the end of the switching cycle to occur outside of the disallowed cycle time period range.

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El Mirage, AZ, United States of America

Alban Shemsedini