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TL7700: No Hysteresis

Pjs
Intellectual 880 points
Part Number: TL7700

Hi, 

Can you clarify what is meant by "If the sense voltage (Vs') does not have hysteresis in it, and the voltage on the sensing line contains ripples, the resetting of TL7700 is unstable" in the datasheet?

Does this mean the device might malfunction operate erratically or does it mean that the device will operate as expected but that if you have next to no hysteresis that RESET pin may trigger many times as you'd expect if the Vsense voltage is crossed continuously?

I have an application where the Vsense is 10.5V for a Vcc=12V. There's minimum hysteresis set but the Vsense is already 1.5V from the 12V rail being sensed. 

Many thanks

  • 0
    TI__Expert 7550 points

    Hello,

    If there is no hysteresis, the reset pin might trigger repeatedly because ripples in the sense voltage might cause the sense voltage to cross the threshold voltage continuously. The hysteresis should be set larger than the worst case peak ripple. 

    Best,

    Walter