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TL431: Thermal coefficienct

Hideki Hayashi1
Expert 8380 points
Part Number: TL431

Tool/software:

Hi team,

For Vi(dev), is it sufficient to enter the maximum value of 34 mV?
For Vrefat25°C, does it mean that the standard value of 2495mV should be entered?

If so, the following part would be 13627.3, and dividing this value by ΔTa, the average temperature coefficient αVref seems to be calculated, but the value is not clear to me.
I am aware that it is an I characteristic, so I would put in a value between -40°C and 85°C.


Can you give me some more details?
We would like to know how much the minimum and maximum value of the reference voltage Vref swings in the operating temperature range 0°C to 40°C for our equipment.

Best regards,

Hayashi

  • 0
    TI__Expert 3910 points

    Hi Hayashi-san,

    Thanks for your question!

    It looks like you are trying to calculate the temperature coefficient for your application for an operating temperature range from 0°C to 40°C.

    This can be done with the following equation:

    tempco = ((VI_dev / Vref@25°C) * 10^6) / (ΔTa)

    tempco = ((34mV/2495mV) * 10^6) / (85°C - (-40)°C)     //this is for industrial temp range

    tempco = 109ppm/C

    For this value of tempco, 109ppm/C * (40°C - 0°C) = 4360ppm 

    4360ppm * 2.495V = 10878uV = 0.011V for the temp range of 0°C to 40°C. 

    I hope this helps!

    Best Regards,

    Andrew Li