Texas Instruments Incorporated
MOTOR STEPPER DRIVER HAVING A SINE DIGITAL-TO-ANALOG CONVERTER

Abstract:

A stepper driver for a motor includes an H-bridge, a sense transistor coupled to the H-bridge, a voltage-to-current (VtoI) converter, and a sine digital-to-analog converter (DAC). The VtoI converter has a VtoI converter input and a VtoI converter output. The VtoI converter output is coupled to the sense transistor. The sine DAC has a sine DAC digital input, a reference input, and a sine DAC output. The sine DAC output is coupled to the VtoI converter input. The sine DAC includes an R-2R network, an offset control circuit coupled to the R-2R network, and a gain control circuit also coupled to the R-2R network.