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TPS7B6733QPWPRQ1-reset deglitch time is too short

Julia Wang
Prodigy 10 points

hi TI,

Is the reset deglitch time normal if it’s too short? The min on the datasheet is 55 us, but I measured that it’s 3.4 us.

  • 0
    TI__Mastermind 23361 points

    Hi Julia,

    I am seeing one potential issue with the measurement you did. In the scope-shot, the output was discharging to zero. Did you use enable pin to turn the device off? When the device is disabled, the internal circuitry is being disabled as well. At the disabled state, the built-in logic including the deglitch time may stop working.

    Deglitch time is meant to prevent the device from issuing a RESET signal when temporary glitch on output happens due to a dip on the supply. In a real application, the dip on the input could happen when the supply is powering on multiple loads. The dip could simply be seen when another load is turning on.

    It's not very easy to measure this on the bench but I would suggest trying to create a pulsed load on the supply of the LDO and this will affect the output. As you increase the pulsed load on the input, the output glitch may get wider. Besides the width, the overdrive may change the deglitch delay as well which means the deeper the glitch, the shorter the deglitch time will become. 

    Does this make sense? Please get back to me if you are still having issue measuring this parameter.

    Regards,
    Jason Song