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LMR38020: LMR38020 FLYBUCK PROBLEM

Part Number: LMR38020

Hi,

I used LMR38020 for a DC-DC flybuck converter with 3 outputs, two of them being not isolated(3.3V/1.5A and 12V/200mA), one of them being isolated(12V/100mA). But the 3.3V output voltage ripple is very large at full load, how should I solve it?

Thank you for your time.