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TMS320F28P650DK: Power Consumption vs. PMD Solution

Jackson Carmichael
Intellectual 1060 points
Part Number: TMS320F28P650DK


Hello

My customer is looking to control four BLDC motors in their system, are interested in FOC, and currently use a combination of PMD's MC50000IOSE8G and MC58420 to accomplish this. I shared the TMS320F28P650DK with them and they said that the device could take 300mA to maintain the server loops even when the motor is in an idle state, and that with his four motor design, that would come out to 1.2A @ 3.3V. 

Questions:

  • After looking at the datasheet, I am unsure where they could be getting this 300mA current draw information, could you direct me to where they could be getting these high current numbers?
  • Is their multiplying of the 4 motors by the 300mA number to get to 1.2A total draw accurate?
  • Do you know how we stack up against these PMD parts in terms of current consumption?

Thanks!

  • 0
    TI__Intellectual 1060 points

    Update on this question:

    The customer said that processing needs to run at full speed when the motor is stationary, and with that being so, a C2000 motor control design he worked on in the past had a current draw of 300mA. But, he noted that the number depends on configuration and the code it is running, and doesn't think the datasheet says anything specifically about 300mA idle state current.

    He also noted that ARM Cortex M4 only consumes 60mA at speeds of 180MHz, which makes it a very appealing option.

    Remaining Questions:

    • Is their multiplying of the 4 motors by the 300mA number to get to 1.2A total draw accurate?
    • Do you know how we stack up against these PMD parts in terms of current consumption?

    Thanks!

  • +1 in reply to Jackson Carmichael
    TI__Guru* 95315 points

    This was resolved offline.