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BQ25792: BQ25792 charging breakdown with Vbus more than 15Vdc.

Part Number: BQ25792

Hi, 

While I have my the BQ25792 on a 4-s batteries application, with the USB PD on 20Vdc handshaked,  the stat-led was blinking at 1Hz then the chip broke down permanently.

I first connect the type-c connector then power up the adapter to cancel unexpected hot-plug surge.

I checked the waveform, it shows like:

Before it broke down, there showed the OVP alert, but the waveform couldn't explain.

Could you guide me on the issue?