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TPS23881: 160W solution

Jamie Tseng
Intellectual 2405 points
Part Number: TPS23881
Other Parts Discussed in Thread: TPS23882, , TPS23880

Hi Team,

Do we have reference design that achieve 160W?

Could we parallel two TPS23882?

Thanks and best regards,

Jamie

  • 0
    TI__Mastermind 41770 points

    Hi Jamie,

    A 160W is nonstandard PoE so the solution would need to be a custom design system. Please see below link of app note that goes up to 200W. I recommend using the TPS23881 with the same PSE changes below. TPS23882 cannot be used. Thanks!

  • 0 in reply to Darwin Fernandez
    TI__Intellectual 2405 points

    Hi Darwin,

    According to draft introduction. The PD must be TI chip of TPS2372-4 to deliver more than 160W.  Am I right of my cognition?

    The IEEE 802.3bt (Draft) standard defines maximum power of 90 W with a 4-pair configuration for a Power over Ethernet (PoE) system. But some specialized applications like daisy-chain PoE in a small cell may require more than 150 W of power. This application report presents a non-standard PoE system that can deliver 200 W of preprocessed power to the load. The non-standard Power Sourcing Equipment (PSE) interface is built around the BT (Draft) compliant TPS23880. The Powered Device (PD) interface is based on the BT (Draft) compliant high-power TPS2372-4. The total solution presents a good example for beyond BT high-power PoE applications.

    Thanks and best regards,

    Jamie

  • 0 in reply to Jamie Tseng
    TI__Mastermind 41770 points

    Hi Jamie, looking at section 4 of the app note. The PSE was able to deliver 200W and 180W was available with 25cm of cable. Note you must have 2xTPS2372 in parallel like in the app note for this to work. Also, be mindful of the cable length. Majority of these types of nonstandard applications will have a short cable so the voltage drop at the PD is still above the UVLO of the PD controller. Thanks!