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TLV2784: Temperature coefficient for open loop gain

Kei Kuwahara
Expert 8710 points

Part Number: TLV2784

Hi team,

Do you have any temperature coefficient for the open loop gain of the TLV2784?

For example, in unit of (%/℃) or graph representing Aol vs Temp?

Best Regards,

Kei Kuwahara

  • 0
    Guru 140200 points

    Hi Kei,

    the temperature coefficient of "open loop gain" is usually not specified in the datasheets. But you can estimate it from the min max "AVD" specification:

    At room temperature the minimum "AVD" is 200V/mV. Over the whole temperature range the minimum "AVD" is 70V/mV. This is a change of 65% referred to 200V/mV. Divided by 70K gives a change of roughly 1% per °C. An "open loop gain" change of 1% per °C makes sense. You will find a similar value in textbooks.

    Remember, this is only a very rough estimation, no exact calculation.

    Kai

  • +1 in reply to kai klaas69
    TI__Mastermind 33723 points

    Kuwahara-san,

    This is difficult to characterize, as the change in AVD is based on a couple different parameters, and it may not shift linearly over temp. Therefore, the guardband is recommended in the TI precision labs video. (this is for GBW, but you can see open loop gain shift as well.

    "Generally you can expect a variation of as much as plus/minus 30% from this value at room temperature, and an additional error of plus/minus 30% over the specified temperature range."

    Best,
    Jerry

  • 0 in reply to kai klaas69
    TI__Expert 8710 points

    Hello Kai-san,

    Thank you so much for your answer!!!

    I have one question, why do you divide the 65% by 70K?

    I think it should be 45K because the temperature difference is 70℃ - 25℃= 45℃？

    Best Regards,

    Kei Kuwahara

  • +1 in reply to Kei Kuwahara
    Guru 140200 points

    Hi Kei,

    yes, you can also divide it by 45K.

    Kai