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TPS55330: TPS55330

Ian Wang
Mastermind 28495 points
Part Number: TPS55330

Hi Sir,

What possible situation will cause TPS55330 occur "current spike"?

Thanks,Ian.

  • 0
    TI__Mastermind 34201 points

    Hi Ian,

    What do you mean current spike?

  • 0 in reply to Zack Liu
    TI__Mastermind 28495 points

    Hi Sir,

    Pls reference schematic as below, the issue is F404 fuse (1.25A) burn out.

    Pls advise what possible cause kindly of issue?

     

    VIN(VPOWER): 4.5V~5V

    VOUT(D5V_OTG): 5.1V

    IOUT(MAX): 900mA (full load)

    Thanks, Ian.

  • 0 in reply to Ian Wang
    TI__Mastermind 34201 points

    Hi Ian,

    The fuse current capability of 1.25A is very marginal.

    Assume the efficiency is 90%, the maximum average input current is 5.1V*0.9A/4.5V/90%=1.13A. However, considering the load transient inductor current step, start up input inrush current, the input current will be higher than 1.25A. 

    To check it, please probe input current during startup and load transient and select a higher current capability Fuse. Hope that helps.