• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 427 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.

DRV8434S: Smart tune decay mode differences

Kei Kuwahara
Expert 7680 points
Part Number: DRV8434S

Hello team,

I am confused between Smart tune dynamic decay and ripple control decay.

What are the main differences between Smart tune dynamic decay and ripple control decay?
I assume current ripple is smaller with ripple control decay, is this understanding correct?

Which decay mode has bigger torque?

Does Smart tune ripple control decay has slower transient performance than dynamic decay? (Because of smaller ripple?)

Best Regards,
Kei Kuwahara

  • 0
    TI__Intellectual 2540 points

    Hey Kei,

    Main difference between the two is conceptual.

    1. Dynamic decay has fixed toff (similar to slow, fast, and mixed decay modes) with some fast decay inserted to make sure current regulation is maintained during decreasing steps.
    2. Ripple Control is not time based but rather current magnitude based. It works on the principle of trying to maintain fixed current level and does factor in the time.

    Also, ripple control method reduces the torque ripple as a key advantage, and is a MUST have for stall detection. For further details, please refer to section 7.3.6.5 (pg 26) and section 7.3.6.6 (pg 28) in the data sheet of DRV8434S. Hope this helps. 

    Regards, 

    Karan