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DRV8312: Free run and brake stop for DRV8312

Robert Cao
Prodigy 10 points
Part Number: DRV8312
Other Parts Discussed in Thread: DRV8332,

Tool/software:

Assuming Figure 8-1. DRV8332 Application Diagram for Three-Phase Operation Schematic in https://www.ti.com/lit/gpn/drv8312 data sheet. 

First, I would like to control the DRV8312 to perform a free run operation for a short duration, allowing the motor to run freely without applying power. Is it possible to set OUT_A, OUT_B, and OUT_C to a high-impedance state and then return them to normal operation when desired? 

Second, I like to put the chip in to brake stop mode i.e. OUT_A, OUT_B, and OUT_C become electrically connected but no voltage/power apply to them. Can it be done?

  • +1
    TI__Guru 55565 points

    Robert,

    If you take the /RESET_A, B, C pins to the LOW state, the corresponding outputs will be in the HIZ state.  

    If you leave /RESET_A, B, C pins in the HIGH state and take the PWM_A,B,C pins to the LOW state, the output low-side FETS will be ON and pull each output to GND.

    Regards,

    Ryan

  • 0 in reply to Ryan Kehr
    Prodigy 10 points

    Thank you for the quick response! I tried it out, and it worked perfectly in HiZ mode. However, the brake stop isn't performing as well as I had hoped. That said, it's still an improvement over doing nothing!