Stepper motor drivers are brushless DC motor drivers that can be used for both positioning and velocity control applications without the need for external position feedback. Typical stepper motors consist of a rotating permanent magnet (rotor) surrounded by electromagnets (stator). When the electromagnets are supplied current in the correct polarity and sequence a torque is created that moves the rotor in steps. These steps can be sequenced together to move the rotor at various speeds corresponding to the sequence rate. Positioning can be accomplished by controlling the number of sequenced steps.
By precisely controlling the current in each motor phase you can divide a motor’s fundamental step angle into smaller microsteps. Microstepping results in better positional resolution, less resonance issues and lower audible noise.
Stepper motor drivers for office automation, industrial, and automotive applications. Depending on the needs of a given application, IC solutions can include features such as:
PWM current control
Parallel, Serial and Step/Direction interfaces
Slow, Fast and Mixed current decay mode control
Protection features – Under-voltage lockout, thermal shutdown, shoot through, overvoltage, over current protection
Package options include exposed pad QFN, TSSOP, SOIC and DIP packages all lead (Pb) free
Internal DMOS outputs or gate controllers to drive external MOSFETs
Stall detect assistance