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Questions about POE Design 1PSE-to-2PD

li haihong
Prodigy 10 points
Other Parts Discussed in Thread: TPS2376-H, TPS23754, TPS23756

I have an design need high power supply POE design,

so I select TPS2376-H,it is 802.3at type1 (high current)   PD CONTROLLER,and the power level is 25W.and then I should bypass these 48V AC power line to an output to another POE device,and this device is 802.3at type1 (normal current),and the power level is 13W。Now i

have some questions about this design:

1:there are  two different power levels on the PD side,does the PSE side(POE Switcher side) can recognize the POE device?or get the wrong power level?

2:If the PSE side(POE Switcher side) can only supply 13W,and the PD side power level is 25W,but PD only consumed less than 13W,does the PSE side can supply the power normally?

Merry Christmas&Happy New Year

  • 0
    TI__Genius 13420 points

    TPS2376-H can't fully support the 802.3at standard. For 802.3at type 1, only support 13W output. If you need PD support the 802.3at standard, you can choose TPS23754 or TPS23756.

    1:there are  two different power levels on the PD side,does the PSE side(POE Switcher side) can recognize the POE device?or get the wrong power level?

    Answer: PSE must support the 802.3at standard, and it can detect the PD controller with right power level.

    2:If the PSE side(POE Switcher side) can only supply 13W,and the PD side power level is 25W,but PD only consumed less than 13W,does the PSE side can supply the power normally?

    Answer: TPS23754/6 can work with the 802.3af PSE normally as 13W output.