• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 62 subscribers
  • Views 114 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS23754: ON/OFF PoE Control with connected to the hub

Shinichi Inoue
Guru 19671 points
Part Number: TPS23754

Dear Specialists,

My customer has an inquiry about TPS23754 ON/OFF control method.

I would be grateful if you could advise.

--- 

We would like to turn ON/OFF the PoE power supply while connected to the PoE hub.

Generally, I think that POE turns off the power by pulling out the PSE side or LAN cable.
We are considering a method that can be turned on/off on the PD side with the LAN cable plugged in.

Looking at the datasheet, it seems that there is no simple EN pin.
Is there a terminal that can be controlled like the EN pin, or is it used to turn the IC ON/OFF?

---

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Mastermind 21320 points

    Hello Shinichi,

    You could use the APD pin. 

    Raising it above 1.5V will:

    • Internal pass MOSFET is turned off

    • Classification current is disabled

    • The LINEUV input is disabled

    • Maintain Power Signature (MPS) pulsed mode is disabled

    • TPH and TPL outputs are turned on (low state) if SCDIS is open

    • TPL duty-cycle becomes 75% if SCDIS level is low

    Alternatively you could use an optocoupler to change the resistance on the detection pin so that the PSE shuts off power.

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    Guru 19671 points

    Hi Michael,

    Thank you for your reply.

    I understand that when APD is used, TPS23754 can turn it on and off on the PD side.

    I'd like to confirm one point.

    The detection pin you mentioned is a DET pin?

    I appreciate your great help.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    TI__Mastermind 21320 points

    Yes, the DET pin is the detection pin. Thanks!

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    Guru 19671 points

    Hi Michael,

    Thank you for your reply.

    I understand.

    I'll share your suggestion with the customer.

    I appreciate your great help.

    Best regards,

    Shinichi