Hi,
We have a custom design using TPS23753A to implement 5V/1.6A poe output. Attachment is the schematic. The schematic refers to TPS23753A-EVM .
when external power into a PD as Adapter Option 2, 5V output is fine.
TP-LINK TL-SF1005P as a PSE,when plugging in the network cable, the output of PD can't get 5V .
Waveform of VDD-VSS is showed as below picture,the TPS23753A can't work normally.
Please advise how to debug this issue, thanks!