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DRV8873-Q1: IPROPI output, IPROPI1 and IPROPI2 are tied and H-bridge use case

Takuma Ito
Expert 5200 points
Part Number: DRV8873-Q1

Hi

What is IPROPI output when the IPROPI1 and IPROPI2 are tied together and used in H-Bridge? Especially in High-side recirculation (brake) timing? the current in both MOS are the same amplitude but opposite direction, so is it cancelled out? 

  • 0
    TI__Mastermind 37683 points

    Hi Takuma,

    The IPROPIx is equal to the scaled down current flowing through the drain to source of the high-side FETs of the respective half H-bridge. Tying IPROPI1 and IPROPI2 together will result in the sum of the current through high side FETs of both H-bridges (HS1 and HS2). However, this is only true if the current is flowing from the drain to the source of both FETs. During high side re-circulation, only one FET will have current flowing from drain to source. so IPROPI (IPROPI1 + IRPOPI2) will only be equal to the current flowing one of the FETs.

    I hope this answers your question.