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TPS65150-Q1: TPS65150-Q1 when Power ON 47.75ms ,SW waveform was stop.

Lawrence He
Genius 3280 points
Part Number: TPS65150-Q1

Dear,
our client use TPS65150-Q1, but we find Power on 47ms, SW waveform was stop.
it`s could be UVLO protect.? or other effect?

We measurement L1 current and Voltage and FB Pin1 Voltage as below chart:

schematic:

101WK0A_HT_20180302.pdf

If any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence.

  • 0
    TI__Mastermind 18550 points
    Hello Lawrence,
    The TPS65150-Q1 device detects a fault condition and shuts down if the boost converter output or either of the
    charge pump outputs fall out of regulation for longer than the fault delay time td(FDLY). Furthermore, the output fault detection function is active during start-up, so the device shuts down if any of its outputs fail to reach their set regulated output level during start-up.

    I am thinking that your customer may have set the DLY1 and DLY2 delays such that negative and positive charge pumps take longer to come up than the fault delay (FDLY) time and that is probably why the device is shutting down since not all outputs have achieved regulation by the time FDLY time expires i.e. the FDLY time expires before all three outputs are fully up and hence the device shuts down.

    I hope this explanation is helpful but please let me know if there are any questions.

    Kind Regards,

    Liaqat
  • 0 in reply to Liaqat Khan
    Genius 3280 points

    Hi, Liaqat

     Thank you! we find the probleam ,our client confirm is FDLY time expires so device was shuts down.

     it`s could be layout issue?


     If any suggestion, Please advise me.

     Thanks,

     Best regards,

     Lawrence.

  • 0 in reply to Lawrence He
    TI__Mastermind 18550 points
    Hello Lawrence,
    I was on a personal leave and just came back. I am glad that the problem was resolved based on my suggestion but if there are any further questions, please let me know.
    Kind Regards,
    Liaqat