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TPS23755: If TPS23755 is defect

Part Number: TPS23755

Hello. I am Jun 
I'm sorry . I have a question.
Could you answer my question and send to me ?

Question:
We are investigating when the circuit of TPS23755 is broken electrically.

When Vcc voltage is not supplied and other power voltage is supplied,
What happen do you think?
I want the answer in following two cases.

i) While the device is working properly 
ii) While power switch of the device is changed OFF to ON at the defect condition.