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LAUNCH-F28027F-BOOST-DRV8301 for Higher Voltage

Tom Hoag
Intellectual 460 points
Other Parts Discussed in Thread: BOOSTXL-DRV8301

I would like to use this board for driving a 48V 4A motor. 

  1. Is it correct that the three voltage sense dividers plus the PVDD divider need to be scaled simply by a factor of 2?
  2. Should the capacitor values be changed to preserve the filter pole?
  3. Are there any parameters that need to be changed, perhaps in user.h?
  4. Are there any other components that need to be altered?
  5. Finally, regarding the lower current requirement, would it be best to change the current sense resistors for my lower 4A current?

Thank you!

  • 0
    TI__Guru** 118000 points
    I think Nick - designer of the BOOSTXL-DRV8301 - will comment, this has been asked several times.
    There is a higher voltage version of this coming out in a couple months...but you should be able to update yours as well.

    1. essentially, if 52.628V is enough headroom for you
    #define USER_ADC_FULL_SCALE_VOLTAGE_V (26.314)

    2. you should preserve a pole somewhere in the 300 Hz range (depending on the max frequency of your motor)

    3. the define above for ADC_FULL_SCALE. you will also change your IQ_FULL_SCALE, initially setting to your bus voltage

    5. You can, but if you know your motor isn't going to command more than 5A continuous, say 7A peak you could just leave this portion alone. You will lose out on some resolution, but it may be easier initially to leave as is. Change it on your board when you design your own.
  • 0 in reply to ChrisClearman
    Intellectual 460 points
    Thank you Chris for that good information. I just ordered the BOOSTXL and hope to get it very soon. I will begin testing at just 24 volts and see how things progress. Then update for the 48V bus as you have suggested. Hopefully it will be all straight forward...:)

    Nick, if you have any additional comments about upgrading my board, please do let me know.

    Thank you!
  • 0 in reply to Nicholas Oborny
    Intellectual 460 points
    Thank you Nick for that link. I did not see any additional issues that might be a problem. It appears capacitor voltage ratings are OK for testing.

    Regarding the higher voltage board that is coming, do you have a new schematic?
    Can you comment on what main components will be changed?
    What voltage will the new board be rated at?

    Thank you!
  • 0 in reply to Tom Hoag
    TI__Mastermind 21305 points

    Tom,

    We are releasing a new BLDC motor driver IC that will have a BoosterPack with it. It will support up to 45V. I recommend proceeding with your current path for a 48V design.