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TPS3760: Checking the calculation for the TPS3760

Francisco Vera
Prodigy 120 points
Part Number: TPS3760

Hello, my name is Francisco, engineer of the R+D+i Department of the Rother Industries & Technology company.

I am writing this post because I want to use the TPS3760A012DYYR for my application circuit. According to the datasheet of the TPS3760, the TPS3760A012DYYR is a monitoring device of undervoltage with open drain and it has got a Vsense=0.8 V and Hysteresis=2%. For a Vmon=24 V and R2=10 kohm, I want to get a monitored UV threshold "Vmon-" of 8 V. Therefore applying the equation 7 of the datasheet: Vsense=(Vmon-)·(R2/(R1+R2)) -> 0.8V=8V·(10kom/(R1+10kohm)) -> R1=90 kohm. On the other hand, for a Hysteresis of 2 % will imply that Vmon = 8.16 V when the reset signal becomes deasserted.

Therefore, I would want to ask the following questions:

1) Are these calculations correct?

2) What tolerance and power values do you recommend for the resistors?

Best regards,

Francisco.

  • +1
    TI__Mastermind 19200 points

    Hi Francisco

    1. Yes, those calculations seem correct.

    2. The resistors will see ~80uA of current. They don't need to be very powerful, you can probably get away with whatever's available in the 0402 case size if you wanted.

    Thanks,

    Andrew