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TPS23861: Power injector with 4-pairs(45W) using TPS23861 Single-port.

BJ Han
Expert 2035 points
Part Number: TPS23861

Hi Penny,

Thank you for your attention and support.
Finally, I will ask you a question.
Products that are currently being developed should support non-standard PD(PD70210).
It is being designed as '4-Paris'.

Using 1Port of the TPS23861 product, I want to develop 4 pairs in parallel.
So, current concept(1PSE x 1PD) solution cannot be satisfied with Standard & Non-standard (3.af, 3at, Class5 or Class6)?

Thank you.

  • 0
    TI__Genius 15655 points

    Hi BJ,

    Your understanding is correct. In order to deliver high power(>30W), it is better to use 4 pair. On TPS23861EVM-612 we have two 4 pair ports. We connect first PSE channel to pair 12&36 and second channel to pair 45&78. Schematic can be found in the TPS23861EVM-612 user's guide. Thanks. 

  • 0 in reply to Penny Xu
    Expert 2035 points

    Hi Penny,

    Thank you for your attention and support.

    So, current concept(1PSE x 1PD) solution cannot be satisfied with Standard & Non-standard (3.af, 3at, Class5 or Class6)?

    Thank you.

  • 0 in reply to BJ Han
    TI__Genius 15655 points

    Hi BJ,

    TPS23861 can deliver higher power through 1 channel. TPS23861's highest current limit is 920mA, so technically the max power through 1 PSE channel is ~50W(57V port voltage). It is just less efficient than 4 pair. so in the upcoming IEEE802.3bt standard, the power must be delivered through 4 pair.  TPS23861 can detect and classify any standard PD and nonstandard UPoE PDs(most common high powet solution from Cisco).

    Best regards,

    Penny