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TLVH431B: Vref tolerance

David Woo
Prodigy 530 points
Part Number: TLVH431B
Other Parts Discussed in Thread: TLVH431

Could you please explain that what is the Vref range of TLVH431B?

I am wondering now that the first Vref has said that the range is 1.224V to 1.259V at TA=Tlow to Thigh,

Why the next delta Vref is 20mV at Ta=Tlow to Thigh?

Which result I should reference?

 

In addition, below shows the calculation formula.

My project application temp is 0-50℃，

But the Vref tolerance is a little bigger at full range ,and is over my design range,

So I need the 0-50℃ data，maybe it match my design range.

Could you help support to calculate the result and tell me how to calculate ? Please help.

 


  • 0
    TI__Mastermind 19370 points

    Hi David,

    I can help you with this question.

    The Parameter "VREF" is showing the Vref tolerance/deviation based on the test conditions.

    [1.234,1.246] is based on the initial accuracy of 0.5%

    next for example the TLVH431BQ.

    [1.221, 1.265] is based on the initial accuracy 0.5% + temperature deviation of 20mV. The reason the minimum is not 1.234 - 20mV or the maximum is 1.246+20mV is because this value is based off of characterization vref vs temp curves. When this device is characterized we look at the absolute min and maximum of all the curves together. This means that the [1.221, 1.265] is saying that the TLVH431 is going to deviate less at colder and more at maximum.

    The parameter "VREF(dev)" is showing the temperature deviation based off each individual device variation. This is unique per device.

    In practice, in your 0C to 50C, temperature range should not experience the full temperature deviation but we cannot guarantee the deviation will be smaller because the temperature drive is based on the box method. The equation on the footnote is how to calculate the temperature coefficient on ppm/C based on the VREF(dev). You can use the equation to calculate the temperature coefficient then use that to calculate a "typical" value of the temperature drift from 0C to 50C but this is not guaranteed because the temperature drift is not linear.

    For more information on the temperature drift and box method, check the document below.