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TL432: How to calculate TL432BQ of the temperature coefficient?

GaryC
Expert 3085 points
Part Number: TL432
Other Parts Discussed in Thread: LM4040, TLVH431, TLV431

May I know how to calculate TL432BQ of the temperature coefficient? Do you have user’s guide to share? Or to provide some examples. Thanks.


  • 0
    TI__Mastermind 19570 points
    Hi Gary,

    We have a document that goes through the basics of temp coefficient in this document below.
    www.ti.com/.../slpy003.pdf
    In general for the TL432 you can use the voltage deviation of 34mV to calculate this.
    temperature coefficient (ppm) = (temp deviation) / (Vref * Temperature range) = 34 mV / (2.495 V * 165C) = 82 ppm
    this is the general way of calculating temperature coefficient. If there is some deviation from this equation it is typically noted such as in the LM4040 family. The LM40xx families specify their way of doing temp co.

    -Marcoo
  • 0 in reply to Marcoo Z
    TI__Expert 3085 points

    The 82PPM is too high, so we can’t meet CPK<1.33 in factory.

    We check the NCP431B and AS431A are low than our 82PPM. Do you have similar solution that has lower Vi(dev). Thanks.

    BR, Gary

  • 0 in reply to GaryC
    TI__Mastermind 19570 points
    Hi Gary,

    Our only shunt devices with lower ppm will be the TLV431, TLVH431, and LM40xx families. What exactly do you need in a shunt reference? Do you need the 2.5V or are you going to gain the device to a higher voltage?

    -Marcoo