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Original question:

THVD1510: Failsafe

THVD1510: RT

Naizeng Wang
Expert 3745 points
Part Number: THVD1510

Hi team,

Why Rt2 is not 120 but 133? How to set the value of Rt2?

Thanks 

  • 0
    TI__Guru 62910 points

    Hi Naizeng,

    The higher value is used so that the effective differential resistance (i.e., between inverting and non-inverting lines) remains 120 Ohms even when considering the effect of the pull-up and pull-down resistances.  For a more detailed derivation, you can reference this application note:

    Please let us know if you have any further questions.

    Regards,
    Max