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DRV8830: Running motor at 6V

Eric Lenington
Prodigy 200 points
Part Number: DRV8830
Other Parts Discussed in Thread: DRV8837, DRV8838, DRV8837C

I'm trying to get some clarification on the VSET DAC. According to the datasheet, the max value of 0x3F yields a DAC voltage of 5.06V. Is this the maximum output voltage to the motor or am I misunderstanding how this value is used? My target motor has a rated voltage of 6V and this is also my available VCC. My voltage will remain constant (i.e. no discharging battery) and I don't need any PWM--just VCC to the motor. What VSET value do I use to achieve this?

  • 0
    TI__Guru** 114905 points
    Hi Eric,

    The DAC voltage is 1.285 V, which yields a motor voltage of 5.06 V. Also please note, the motor can take some time to achieve the desired speed.

    Based on your stated goals, please look at the DRV8837C, DRV8837, or DRV8838. These devices have a higher voltage rating, and a simpler interface. The devices do not have current regulation, but does have under voltage, over current, and over temperature protection.