Ripple on EN pin of TNY 268

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Hi all,

My power-supply is designed to deliver 5.5V @100mA, I have no problem with regulation or stability. But still if i monitor EN pin of TNY268 i get 80mV of ripple , is it OK or their is some problem, .

For reference i am using TL431.

Its urgent

첨부 파일Size
feedback loop.doc46 KB