IssueRaiser

> putting the laptop under load makes the coil whine go away Probably be sub-harmonic oscillation.

> putting the laptop under load makes the coil whine go away Probably be sub-harmonic oscillation. Under light loads the control loop can 'hunt' at a much lower frequency then the loop frequency. Combine that with an unlucky inductor and you get a high pitched whine. It's an annoying problem because in susceptible designs it'll show up in a small percentage of some but not all production lots. Take your laptop back.

Posted by Gibbon1 on Nov 1, 2022, 10:38 AM

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hackernews (Other)

> putting the laptop under load makes the coil whine go away Probably be sub-harmonic oscillation.

Gibbon1Nov 1, 2022, 10:38 AM

> putting the laptop under load makes the coil whine go away Probably be sub-harmonic oscillation. Under light loads the control loop can 'hunt' at a much lower frequency then the loop frequency. Combine that with an unlucky inductor and you get a high pitched whine. It's an annoying problem because in susceptible designs it'll show up in a small percentage of some but not all production lots. Take your laptop back.

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