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LM5050-1: Leakage current of LM5050-1

Part Number: LM5050-1

Tool/software:

Hi Team

Customer is using LM5050-1 as the oring controller. as the following picture, they found there is a leakage current on Vs PIN  when applying 3.3V power on ON/FF PIN, when disconnect the 3.3V power to ON/OFF pin, this leakage current of Vs will disappear.  

Can you help to understand if this is related with the internal circuit?