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DRV8323R: 6 step commutation using 3xPWM mode

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Part Number: DRV8323R

Dear all,

I am currently working on my system with a DRV8323RH driver and a BLDC motor. The initial prototype is using 1xPWM mode successfully and I am planning on going towards 3xPWM mode. Please note, that I am using custom PCB and software. 

The idea now is to implement : 

  • 6 step commutation using 3xPWM mode     -> Validate by comparison with 6 step commutation with 1xPWM mode
  • FOC control using 3xPWM mode                 -> Validate by showing efficiency improvement over 1xPWM mode

The logic table used internally by the 1xPWM mode is the following and I assume this is what I should replicate for 6 step commutation with 3xPWM mode. 


And here are my questions : 

  1. Is the assumption above correct ?
  2. How to set (GHx = GLx = LOW) as it is shown on the truth table above ? I think I should just put INLx = LOW meaning this pin should not be tied to HIGH in the design. Can you confirm ?
  3. Is the synchronous rectification performed automatically by the DRV in 3xPWM mode ?


Thank you all for your answers !


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