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TPS23730: APD pin function

Tommy Tzeng
Genius 5895 points
Part Number: TPS23730
Other Parts Discussed in Thread: TPS23734

Tool/software:

Hi Sir,

we have reviewed this schematic and there seems no problem, but only one place where we think is risk, 

customer use the dual input function and using optocoupler to make, when there is no APD_IN, is TPS23730_APD in Hi-z status? can Pin 5_APD be in Hi-z status?

could you please conform for us whether there any other risk in this schematic? thanks for you help and learn from you,

schematic as below:

TPS23730RMTR_review_MiEAP03260BE_C2-1_2025013 (1).pdf

  • 0
    TI__Mastermind 37111 points

    Hi Tommy,

    Thanks for reaching out!

    Due to the tasks accumulation after international labor day in May, we need longer time to response E2E. Please allow 2-6 business days for us to reply your question. Sorry for the delay and thanks for the patience!

    Best regards,

    Diang

  • +1 in reply to Diang Xing
    TI__Mastermind 37111 points

    Hi Tommy,

    If customer wants to disable the PD chip when they have a DC jack on 2nd side, the most recommended way is pull down the DEN as below.

    APD is for DC jack on the primary side and refers to TPS23734's RTN GND. If DC jack is on 2nd side, when you pull up APD, like the way in schematic, the APD voltage will drop as VB will drop and VDD-VSS will drop. The PoE may lose connection but retry connection when VDD-VSS is discharged fully. Then goes into a hiccup.

    Doing DEN pull down can avoid the PoE retry.

    Best regards,

    Diang