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can DRV8308 lock a BLDC actively?

Marco54867
Intellectual 285 points
Other Parts Discussed in Thread: DRV8308, DRV8308EVM

can DRV8308 lock a BLDC like a stepper? ie, active two half bridge, so motor can be lock

  • 0
    TI__Guru 65450 points
    Marco,

    Yes it can! What you would do is connect MCU GPIO pins in parallel with the Hall inputs you want to control. In normal operation, the GPIOs need to be Hi-Z so that they do not interfere with normal hall operation. When lock is required, you could use the GPIOs to pull the requested phase inputs HIGH or LOW as you see fit. Note that this may cause a large current through your motor so motor specifications and power supply needs to be monitored and considered carefully. The DRV8308 should monitor this current through the sense resistor and limit it using Vlimiter but I would set a low current limit to try this initially.

    Regards,

    -Adam
  • 0 in reply to Adam Sidelsky
    Intellectual 285 points

    what a imaginative idea!

    i got a DRV8308EVM just now, will try it later, thank you very much!