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TPS23754: inrush current issue

Tommy Tzeng
Genius 4805 points
Part Number: TPS23754

Hi Sir,

may we know why the inrush current is so large? could help check if there problem with the schematic or any suggestion and idea? let we learn from you. thanks.

please kindly refer the attached and the waveform below.

v2765ax_poe(1).pdf

  • 0
    TI__Mastermind 21320 points

    Hello Tommy, 

    Can you check to ensure the current probe is deguassed and auto-zeroed before measuring? 

    It appears that the nominal value is -210mA, and then a class waveform is seen. Additionally, the schematic says it is class 4 but I do not see two class fingers. I would check the test equipment first to ensure our measurement is accurate. 

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

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments