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TPS23758: TPS23758:PD input is always 0>52>0>52>0....,output is always 0>9>0>9>0...

Part Number: TPS23758
Other Parts Discussed in Thread: TIDA-010083,

I want to use the tps23758 to transfer a PSE(48V) to 5V output,the board tida-010083 is used for reference circuit.The circuit is as shown below.

D20、R66、F10 is not conneted now.

The supply 48V voltage waveform is as shown below.

The output 12V voltage waveform is as shown below.

At first, I suspect it was a short circuit,but i can‘t find any place is shorted.I also use a Stable 48V power supply as input,there is no damage to any parts and the output voltage is always 0,VCC is always 13V(when PSE input,it,s 13>8>0>13>8>0....).

I try to add a load in the output,it,s also no use.Do you have any ideas?