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TPS65988DK: Question of TPS65988

Part Number: TPS65988DK
Other Parts Discussed in Thread: TPS65988

Dear Team,

Some questions about TI / TPS65988 .

We met a situation that had a discontinuous power supply from USB PD 20V Power. We have measured the 3 points below, and we found the PP_EXT of TPS65988 would de-assert regularly. So, are there any reasons that would cause the PP_EXT de-assert?

 

From my point of view, I think the CC has hand shaking already. The 20V power should be supplied steadily, but it seems the 20V power was shut down and TPS65988 was restarted again and again. So, are there any reasons that would cause the 20V power-off?

Many Thanks,

Jimmy