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Use DRV8835 for brushless motor control Y connected A, B, C windings?

lloyd konneker
Expert 1790 points
Other Parts Discussed in Thread: DRV8835, DRV10975, DRV10983

I want to drive a brushless DC motor that has Y connected windings, i.e. three phase, call the pins A, B, and C, each pin to a coil with the other legs of each coil all tied together inside the motor.  A typical design uses three half-bridges.  Is there any reason I couldn't use three of the DRV8835's half-bridges for this purpose?

I hesitate to ask, since it seems if that were possible it would be mentioned in the data sheet (except maybe there are specialized IC's for that purpose?)

  • 0
    TI__Guru** 114905 points
    Hi Lloyd,

    Conceptually, you are correct. This would work. But the DRV8835 does not allow the high impedance state of only one of the output pairs. It does not appear to be possible to drive an output high or low with the other output high-Z.

    Also, controlling the current is difficult as there is no path to place a sense resistor.

    Have you looked at the DRV10983 and DRV10975? These devices are fully integrated, and do not require additional logic to drive the half bridges.