• State TI Thinks Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 658 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8873-Q1: Current Sensing in High-Side Recirculation

Shinichi Yokota
Genius 9715 points

Part Number: DRV8873-Q1

Hello,

When IPROPI1 and IPROPI2 pins of DRV8873S-Q1 are tied together as shown in Figure 14 in order to measure a motor current, how can a current in high-side recirculation mode be measured at the pins? Will it be double the current? Or, will it be cancelled to zero?

Best regards,
Shinichi Yokota

  • 0
    TI__Guru 56650 points

    Yokota-san:

    In Figure 14. configuration, the current-sense output is proportional to the sum of the currents flowing through the both high-side FETs when that FET is on.

    If the FET is off,  IPROPIx cannot measure the FET current.

  • 0 in reply to Wang5577
    TI__Guru 56650 points

    Yokota-san,

    If both FETs are on, I would think the IIPROPIx can only show the current flow from Drain to source. So, IPROPIx output in Figure 14 would only show SH1 top FET's current when the current flows as loop 2 direction.