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TPS2373: PoE Not Enough Power Detection

Ryan Wang
Prodigy 90 points
Part Number: TPS2373
Other Parts Discussed in Thread: LM5156, BOOST-PSEMTHR-007, TPS23881EVM-008, USB2ANY

Hello there:

Right now I am thinking of using TPS2373 + LM5156 as a combination to do the PD side power control. I am wondering what would be the best way for us to detect if the PSE (switch/injector) connected to this cannot support enough power which could potentially cause the DUT to boot loop. Noted that during the classification phase everything is working ok, but suddenly the DUT would require more power from the PSE and due to the possible overload on the PSE (switch) it would just not be able to support that much power. Is there a way to detect this easily? 

Thanks

  • 0
    TI__Mastermind 20521 points

    Hi Ryan,

    Thanks for reaching out! 

    May I know what Type of the PSE and what Class of the PD you used? Normally PD's power should lower than the PSE's to avoid triggering PSE's overpower protection. For trainset overload, a sufficient capacitor may help.

    If you want to see if the PSE disconnected the port for overload or some other reasons. TI's TPS2388x GUI can detect whether P_cut is triggered during operation. 

    TI’s PSE Hardware:

    1. BOOST-PSEMTHR-007 (you can contact TI's FAE to request a free sample)
    2. TPS23881EVM-008 (you can contact TI's FAE to request a free sample)
    3. USB2ANY Interface Adapter (you need to purchase one)

    Software:

    1. Download: https://www.ti.com/lit/zip/slvc772
    2. User guide: https://www.ti.com/lit/ug/slvubp0a/slvubp0a.pdf

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    TI__Mastermind 20521 points

    Hi Ryan,

    Since we have not got the response for a relative long time, I will close this thread for now. Please reply or open a new thread if you have further questions.

    Best regards,

    Diang