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Transformer Audible Noise

Posted by: aliaykan on

Hi,

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)

Regards,

Ali AYKAN

Comments

Submitted by PI-Dunwell on 12/09/2014

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

Submitted by aliaykan on 12/14/2014

Is increasing NS enough for lowering flux density?

Thanks.

Submitted by PI-Dunwell on 12/16/2014

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