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TPS2373: Creating a POE-powered passthrough device

Jordan Leong
Prodigy 30 points
Part Number: TPS2373

I am attempting to create a device that will use 802.3bt PoE for power. This device does not require ethernet data but will pass both data and power to an RJ45 output. 

Currently, I am planning on using the TPS2373 reference design to create a PD and leave the secondary side of T1 not connected since I don't need power. I will then connect the 8 leads of the RJ45 input directly to the output. 

My plan is to allow the TPS2373 to negotiate 802.3bt power, then the data/power will be passed straight through to the RJ45 output for the secondary device. I am looking to see if this is a valid design, or if I need to add a PSE controller in between the two RJ45 connectors to create a handshake with my secondary device.

  • 0
    TI__Mastermind 37081 points

    Hi Jordan,

    Thanks for reaching out to us!

    The PoE transformer (T1) splits the power and data. For each Ethernet pair (e.g. PR12), they have the same DC voltage potential but different AC signal information (e.g. voltage of #1 = +DC (refer to PSE GND); voltage of #2 = +DC (refer to PSE GND) + AC (refer to #1) ). When they goes to PD, the AC signal will be eliminated and only DC voltage is left as a DC voltage source. If you want a passthrough for both data and power, you need to split them first and recombine them and send out by PSE. 

    Best regards,

    Diang

  • +1 in reply to Diang Xing
    TI__Mastermind 37081 points

    Hi Jordan,

    Since we have not got your response for a relative long period. I will close this thread for now and one of the post is recommended for the potential answer.

    If you have any further questions please feel free to contact us.

    Best regards,

    Diang