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TLV3011 - Output current limiting

osmont jean-baptiste
Prodigy 70 points
Other Parts Discussed in Thread: TLV3011, TLV3012

Hi all,

I have implemented a TLV3011 comparator as described below

That said, I am a little bit worried about the high current that would flow from Cp capacitor (10µF for the current design but could go over 50µF)  to the TLV3011 output when the output goes to low state.

I read in the datasheet that the output is "short-circuit to ground" tolerant but I presume that only concerns the TLV3012 part.

Could you tell if this high capacitance output would be armufull for the comparator, even if the high to low state should occur about one a day in ower system ?

Or I need to add a limiting resistor between comparator output and Cp capacitor ?

Thank you in advance for your answer.

Best Regards,

Jean-Baptiste Osmont

  • 0
    TI__Guru* 93105 points

    Hello Jean-Baptist,

    The 10 uF capacitor will be charged by the 56.4 k pull-up when the TLV3011 output is in the high state. In that case, the output NMOS FET does not provide any current to the capacitor. It is when the output is directed to switch low the NMOS output FET conducts and sinks current from the 10 uF capacitor and 56.2 k resistor. Even though the capacitor has the ability to provide fairly high current for a short instant, the ON resistance of the NMOS FET will limit how much current it can sink. That current will be self-limited to no more than a few tens-of-milliamperes, which is within the handling capability of the TLV3011.

    It should not be necessary to add a resistor in series with the capacitor. Doing so would add delay to the capacitor discharge time.

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 70 points
    Hello Thomas,
    Thank you for your reply, you answered my question.

    Regards,
    Jean-Baptiste