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LM5050-1: LM5050-1 Leakage question :

Part Number: LM5050-1

LM5050-1 Leakage question :
follow below pic circuit, PWR2 provide DC 24V and PWR1 is open, then U4 LM5050-1 turn on MOSFET and offer DC24V for Systme ,But we detect DC1.2V in PWR1 net , please help Explanation it, thanks !