Transformer Audible Noise

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I designed a 25V/1A Led Driver with TOP264KG. Secondary side controller with SEA05 CC/CV. Design working well. Only problem is audible transformer noise. Transformer winded tightly in a winding machine and varnished. I tried two different transformer according to efficiency level. But sound didn't change by increasing or decreasing. I divide the primer two section (sandwich)



Try lowering flux density of the transformer. Make sure also that the operation is stable.

Is increasing NS enough for lowering flux density?


You need to increase primary number of turns or core area.