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TOP265 Noise Problem

Posted by: rowel@hanconli… on

We have existing design using TOP265 for 20W(24V/0.83A) LED driver application.

Vin  = 180VAC-265VAC

Problem : Noise in all load condition. (No Load - Full Load). Please advise what is the possible problem.

Thank You!

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TOP265 24V0.83A(20W).pdf 56.54 KB

Comments

Submitted by rowel@hanconli… on 01/13/2016

Hi PI,

Please reply.

Thanks

Submitted by PI-Crumb on 01/14/2016

If the noise is originating from the transformer, then please try to dip varnish the transformer to minimize the audible noise. Also, it is recommended to set the maximum operating flux density BM to below 3000 gauss.

Submitted by PI-Crumb on 01/14/2016

If the noise is originating from the transformer, then please try to dip varnish the transformer to minimize the audible noise. Also, it is recommended to set the maximum operating flux density BM to below 3000 gauss.