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LM5161: Vcc will increase when Vin plug the 48V battery input

Part Number: LM5161

Dear Expert

Below is waveform measurement data on actual circuit application of LM5161PWPT. 

-the abnormal 20V peak voltage was occurred on pin-10 (VCC pin) when hot plugging process (power on input DC voltage to input pin-3 of LM5161PWPT by manual plugging of external 56V connector).

- the abnormal 20V peak voltage issue is not occurred when cool plugging process (manually insert the connector of external 56V first, then power on input 56V DC voltage to LM5161PWPT).