Hi Ian,
Thanks for your patience. Please see the comments below:
1. I may not be familiar with this application, just curious if it is ok that when R2 is mounted, your circuit will have 57-V rated surge varistors in parallel with Bob-smith termination with 2-kV rated isolation. In this case, the isolation voltage will be degraded. Then the 802.3bt isolation requirement may not be met.
2. It is recommended to make the GND_EARTH not crossing the PoE wires. Better to make a clear boundary with proper insolation distance.
3. The polygon of Vneg in inner layer covers some through holes. TPS23751’s pad also has concerns.
4. The distance between primary side FET and Vneg are too close. Please consider increase distance to >0.6m to ensure sufficient clearance distance and reduce noise coupling.
Best regards,
Diang
