Full-Scale Current Adjustment Using a Digital-to-Analog Converter (DAC)
The ability to dynamically control current in an inductive load system is very important for stepper motor designs where different levels of torque control are desired. This adjustment feature can also be used to improve system efficiency by reducing the motor current in low-load situations, achieving a longer battery life.
This application report is provided as a supplement to the data sheet for the DRV8884, DRV8885, DRV8886 and DRV8886AT motor drivers. The goal of this document is to show how to achieve accurate current regulation in normal and low-power modes using different methods. This document also describes different sources of error in these configurations, how to minimize these errors, and the key factors to consider when doing a design.