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Reg.DRV8871 Grounding scheme

Ibram Sahibu
Prodigy 150 points
Other Parts Discussed in Thread: DRV8871

Hi,

I am planning to use DRV8871 in our design for driving the motors. I would like to know few things that need to be taken during the design.

1. How do we make sure noise from does not get into the system? As we are planning to one battery which connects to Motor as well as the micro controller (after down converting it).

2. What kind of ground separation available in the DRV8871 between GND and PGND?

3. If we want to take care outside, what would be the right idea to begin with?

Regards,

Ibram

  • 0
    TI__Guru** 114905 points

    Hi Ibram,

    We will investigate and reply soon.

    Can you provide some additional information?  What type of noise are you trying to keep out of your system?

    What would you consider acceptable circuitry to take care of separating the grounds externally?

     

  • 0 in reply to Rick Duncan
    Prodigy 150 points
    Hi Rick,

    I would want to keep out the switching noise of motor form the system. We would be switching the motor about 2K to 10KHz range.

    I may consider having power isolation(DC-DC) for system power and let the motor to power from battery directly. Please provide your thoughts as well.

    Regards,
    Ibram
  • 0 in reply to Ibram Sahibu
    Prodigy 150 points
    Hi Rick,

    I would want to get one more suggestion from you.

    Actually we have 2 motors(Same motors) and they are separated by 1 feet from each other. Is it good to choose one Dual Driver or go with dedicated driver for each motor?
  • 0 in reply to Ibram Sahibu
    TI__Guru** 114905 points
    Hi Ibram,

    Either configuration works well. In my opinion, this depends on the application, the current required, and the cost.

    The current required per motor may push you to dedicated drivers.
    A dual driver can reduce the number of support components, such as charge pump capacitors if the driver requires this.
    Are you considering pushing the motor driver out to the motor? Moving the motor driver output to the motor increases the number of wires (you need additional control wires)
  • 0 in reply to Rick Duncan
    Prodigy 150 points
    Hi Rick,

    Thanks for your suggestion.

    Yes motor driver will be on PCB and the motor will be on separate mechanical assembly as application requires.

    When can I expect the response for the other questions?

    Regards,
    Ibram
  • 0 in reply to Ibram Sahibu
    Prodigy 150 points

    Hi Guys,

    Is there any update for me?

    Regards,

    Ibram