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TL331: TL331 Precision

user5861925
Intellectual 570 points
Part Number: TL331

Hi:
The product I designed USES TI TL331 to control the power switch through voltage comparison.I would like to know the IN+/IN-pin precision range of this device.IN addition, IN+ voltage is greater than IN- voltage range,  Vout Pin will become high level, thank you!
BR
Sunny

  • 0
    TI__Expert 4555 points
    Hi Sunny,

    The VIN range for this device is from -0.3V - 36V, and has input offset voltage of 2mV (TYP) and 5mV (MAX) at room temp. The input offset voltage will be max 9mV across all temp range of the device.

    Regards,
    Jonny
  • 0
    TI__Mastermind 49966 points

    Hello Sunny,

    The "Precision" is dominated by the offset voltage specification.

    The offset specification for the TL331 is a maximum of 5mV at room temperature, and 9mV over the full operating temperature range.

    The 5mV is tested in production, so you should never see a device over 5mV at room temperature.

    The offset number is both positive and negative (±9mV). So you should design expecting both a +9mV AND -9mV error in the comparison to the applied reference voltage.

    For further information on comparators, please see the TI Precision Labs section 15 on comparators:

     https://training.ti.com/ti-precision-labs-op-amps#section-15