https://www.edaboard.com/showthread.php?213912-what-cause-SMPS-to-make-audible-noise
The noise is simply changes in currents in inductors causing magnetic fluctuations which results in a slight mechanical movement in and around them. They are acting like tiny loudspeakers.
Some SMPS have switching frequencies higher than the audible range so you don't hear them, others have more rigid components so they move less. Changes in current or voltage will change the switching frequency or waveform, that's why the sound changes. It's quite normal, if annoying at times!
The noise is simply changes in currents in inductors causing magnetic fluctuations which results in a slight mechanical movement in and around them. They are acting like tiny loudspeakers.
Some SMPS have switching frequencies higher than the audible range so you don't hear them, others have more rigid components so they move less. Changes in current or voltage will change the switching frequency or waveform, that's why the sound changes. It's quite normal, if annoying at times!
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