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Important DRV8824/DRV8825 Specification Missing from Data Sheet

Scott Newell
Prodigy 10 points
Other Parts Discussed in Thread: DRV8824, DRV8880

Motors are there to provide torque which is proportional to current. Why are there insufficient specifications in the DRV8824 data sheet to calculate motor current tolerance? The current amplifier gain only has a nominal specification which is for "Reference Only". Even if the gain tolerance is really bad we need to know what it is.

  • 0
    TI__Guru** 114905 points
    Hi Scott,

    I believe the motor current tolerances can be calculated using the current trip accuracy. These values include the entire system (amplifier, comparator, DAC).

    Please note that the current trip point is only the point at which the current regulation begins. The average current can be less (or in some cases more) depending on the system voltage, motor inductance, and decay mode.

    If you are looking for more torque at each step, please look at the DRV8880. Assuming the current and voltage specs meet your requirements, it is the latest generation stepper motor controller that automatically adjusts the decay mode for optimal current regulation.