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TPS23754: TPS23754 PoE Input voltage

Part Number: TPS23754
Other Parts Discussed in Thread: TEST, , PMP10288

Hi~ TI expert

I've test a board using TPS23754. And shemetic is same with reference design PMP10288.

If the auxiliary voltage is entered, it is working but does not operate when the PoE input is applied. no output voltage, no switching.

Could you tell me check point for PoE input?

thank you

  • Hi Mason,

    If you are not getting power from the PoE input, I would first check detection. Also, during detection, make sure your load isn't too large (drawing too much current).

    Could you take startup waveforms when PoE input is applied? See Section "7.4.1.2 PoE Start-Up Sequence" of datasheet, SLVS885H.

    Thanks,
    Thomas A.