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TLVH431: Clamp circuits for AM572X

James Zhan
Expert 4365 points
Part Number: TLVH431

Hi team,

My customer is using AM572X EVM and found the TLVH431 in #5 page as attachment, could you please help to show how this circuit work and why we need this circuit?

Thanks.

ARM MPU AM572X Industrial EVM.pdf

  • 0
    TI__Mastermind 19370 points

    Hi James,

    The TLVH431 is basically a smart Zener diode that is much more precise and lower Iq than a Zener diode.

    In this situation, they are used to clamp or regulate the voltages between the two rails. The voltage difference is set per the gain resistors R895/R897 & R899/R901.

    Since the TLVH431 can only sink 70mA, the PNP's are their to increase the current sink capability of the device.

    The main reason the ARM MPU can be found here