 Quote by ElectroPhysics
I have a problem with my switch mode power supply, smps. It creates audio sound when I power it up, especially at minimum load. As I increase the load then sound disappears and in some designs it is still there. I don't know what to do. It is a bottleneck for me. Anyone who knows what to do about it. I'm operating it at 50KHz which is well above audio frequency.
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Most likely it is magnetostriction noise in your main switching magnetic component. What topology is your SMPS? What transformer/inductor are you using? The general fix/prevention is to put some epoxy material in the gap of your transformer. Who is your transformer/inductor supplier?