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LM5143-Q1EVM-2100: Abnormal output when Vout = 6.6V(single output, dual phase)

Part Number: LM5143-Q1EVM-2100

Hi Team,

I modified the EVM and met some problem. Please see below image.

Sometimes, output =5V when I set Vout = 6.6V and I tried to re-power up the system and the Vout can be 6.6V. 

Regards,

Roy