Hello,
I have a design for the TPS23758 that is based on the reference designs, EVM and the schematic review guidelines provided by TI. I've built about 25 boards with the design and have hundreds of hours of time on them, but I've now had about 5 boards that have failed with an apparent issue with the POE circuit. I can power my boards up with a different voltage supply (VBUS) connected to the APD pin on the TPS23758, and the boards still work, suggesting it is not an issue with the load and could be with the POE circuit itself.
The full design pulls around 3.5 watts maximum (from the PSE), my POE output voltage is 5 VDC.
My question is: are there any common failure modes I missed accounting for in my design? Or is there anything that sticks out as risky/inappropriate for this type of load?
I appreciate any help!
Best Regards, Matt