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Suitable chip for isolated power supply

Other Parts Discussed in Thread: UCC28600, UCC28610

Dear Sir

 

Can somebody give me advice what chip is suitable for power supply

 

Isolated, max power 21W, flyback, switching frequency among 170 - 200 kHz fixed, input AC 180V - 260V, fast response from 11W load to full load,simple

reference design if available.

 

I chose UCC3809 but I am not sure if it is good solution.

Thank you[:|]