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TPS23754: TPS23754 fails to output normally

user5978979
Prodigy 30 points
Part Number: TPS23754

The schematic diagram is designed according to the recommended design. After power on, the board card does not output, and the high and low level of the test den pin is repeatedly switched. The same is true for the primary waveform diagram of the test transformer

  • 0
    TI__Mastermind 21320 points

    Hello,

    Can you provide a schematic? 

    How are you powering the device? Have you tried powering the DCDC directly to see if the power stage works?

    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
    Prodigy 30 points

    4846.345.pdf

    This is my schematic diagram. It has not been tested with an adapter


    This is the oscillogram for testing den pin, the same is true for transformer primary. I want to ask if this is the failure of detection? Is it the cause of the short circuit

  • 0 in reply to user5978979
    TI__Mastermind 21320 points

    Hello,


    Thank you for the schematic. For the scope shot, can you include the volts/division and the time scale? I cannot tell with certainty what this signal is. 

    Can you try powering your device with an adapter?
    Additionally, what is the load on your system?
    What are you powering your device with?

    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
    Prodigy 30 points

    I use a professional Poe power supply router for power supply. The load of the system is 100 ohms. I haven't tested the adapter for power supply. Here is the waveform of my specific test point. Please refer to the following. Is it caused by short circuit in some parts of the system? Looking forward to your reply，Thank you.

    7382.Test.rar

  • 0 in reply to user5978979
    TI__Mastermind 21320 points

    Thank you for your replies.

    Can you probe VC and the gates of the primary side FETs to confirm if the IC is turning on and the FETs start switching?


    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
    TI__Mastermind 21320 points

    Hello,

    We have not heard anything from your end in over a week, I am marking this thread as resolved.

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

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments