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Smallest board space solution for sub-5 watt brushless motor position control?

Darrin Weiss
Prodigy 20 points
Other Parts Discussed in Thread: MOTORWARE, DRV10873, DRV11873

Looking for  guidance on a motor drive solution that provides motion (position) control of a small brushless motor with incremental encoder.   Minimizing board space is desirable.  I estimate using a ~12V bus and an output stage that can provide ~0.5A peak, ~0.25A continuous.  Comments appreciated!

  • 0
    TI__Expert 8980 points
    Hi Darrin,

    I understand board space is a desirable function. To mold the specifications to conform with your design needs, I would recommend going through our Product Selection screen for Brushless DC Motor Drivers with integrated FET solutions. The link can be found below:

    www.ti.com/.../brushless-dc-drivers-with-fets-products.page

    Once we have a selection of motor drivers that meet your functional requirements, we can move ahead and find the motor driver solution that meets the smallest board space possible.
  • 0 in reply to Hector Hernandez Luque
    Prodigy 20 points

    Hi Hector, Thank you for the reply.  I took a look through those products with integrated FET's.  Its seems that none of them provide for motor position control (via a quadrature encoder input for example)?

    In concept, it seems I'm looking for a monolithic product with InstaSPIN-MOTION capabilities.  Does such a device exist, and if not, what is the smallest board space that could be achieved with the minimal amount of parts, in the power range I have specified?

  • 0 in reply to Darrin Weiss
    TI__Expert 8980 points

    Hi Darrin,

    I have been reading some INSTASPIN labs and found a solution section for MOTION. Now, the example projects found for these solutions, which can be seen in the images attached, are all for driver solutions with external FETs, as all these labs are example projects with the INSTASPIN-MOTION code implemented for them. The User Guide for MotorWare can be found in this directory after it has been installed:

    C:\ti\motorware\motorware_1_01_00_15\docs\labs\instaspin_labs.pdf

    For finding out more information on adapting INSTASPIN-MOTION control for a solution that utilizes a driver with internal FETs, I suggest finding out more information on the INSTASPIN e2e:

    https://e2e.ti.com/support/microcontrollers/c2000/f/902

    Now, for a solution that meets your power requirements, here is low cost, and utilizes small board space  I suggest the DRV10873:

    http://www.ti.com/lit/ds/symlink/drv11873.pdf

    For your encoder configuration, I recommend a C2000 MCU, as it provides the eQEP and eCAP for controlling speed and direction in a quadrature encoder setup. In total component count and size, we can take the DRV11873 EVM, found below, change the timer IC to a C2000 MCU, and add the quadrature encoder interface. 

    The C2000 MCUs that include these features can be seen below and in the following link:

    http://www.ti.com/lit/ml/sprv067/sprv067.pdf

    Does this example conform to the functional requirements and size desirables?

    Here is the evaluation module:

    http://www.ti.com/lit/ug/slwu083a/slwu083a.pdf

    A description of how eCAP functions work is found in Section 3.3.5, while an eQEP description is found in Section 3.3.7 of the C2000 Peripheral Description document found below:

    www.ti.com/.../spru566l.pdf