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LM2678: Output issue

Part Number: LM2678

Hi

My customer has question.Please cooperate me.

Problems have occurred with the following spec.

Vin=24V

Vout=3.3V(fix)

Cin=220uF/Cout40uF

L=33uH

A phenomenon occurs in which the output voltage increases at no load.

I saw this thread.⇒

Why is it not working properly without low current flowing?

Could you tell me the mechanism?

Best Regard

T Kishi