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TLV1702-Q1: TLV1702-Q1 hysteresis adjustment

Dhareppa Zinjaravad
Prodigy 70 points
Part Number: TLV1702-Q1
Other Parts Discussed in Thread: LMV7271

Hi,

Planning to use IC TLV1702-Q1 as a analog voltage comparator. Moreover, we have variable reference adjustment (i.e. from 0.5V to 10V & -0.5V to -10V).

Question is, How shall I adjust the hysteresis (Rh) for the whole range?

Requesting your suggestion to proceed further.

Thanks

Dhareppa Z

  • 0
    TI__Mastermind 23050 points

    Hi Dhareppa,

    What do you mean by adjust the hysteresis for the whole range? If you move your reference voltage the center voltage of your hysteresis will move with it while the width of your hysteresis will stay the same. If you are using a negative reference voltage and trying to have your hysteresis move to negative input voltages, you will need to use dual supplies. I have attached an example simulation file so you can observe this behavior and confirm that this will work for you.

    Comparator with variable reference.TSC

    Regards,

    Zak Kaye

    Precision Amplifiers Applications

  • 0 in reply to Zak Kaye
    Prodigy 70 points

    Hi Zak,

    Thank you for the reply. What could be the optimum resistor (Rh) for reference range 0.6 to 10V?

    Moreover, I am feeding reference voltage directly to +Ve of O-Amp. No resistor divider in-between.

    Regards

    Dhareppa Z

     

  • 0 in reply to Dhareppa Zinjaravad
    TI__Mastermind 23050 points

    Dhareppa,

    The optimum resistor value is going to depend entirely on how wide you want your hysteresis window to be. Hysteresis works by adjusting the voltage seen at the non-inverting pin. If you place your reference directly on the non-inverting terminal, and thus force that terminal to always be at that voltage, you will not have hysteresis. I have attached a brief presentation that walks through how to set up inverting or non-inverting hysteresis. Additionally, the application section of the LMV7271 contains some good information on the subject that you may find helpful.

    Comparator with Hysteresis.pptx

    Regards,

    Zak Kaye

    Precision Amplifiers Applications