Supplied in 20-pin TSSOP package, Model A4992 operates bipolar stepper motors in full, half, quarter, and eighth step modes at up to 28 V. Unit includes stall detect features and advanced diagnostics that can be configured through serial interface. Current regulator, operating with fixed frequency PWM, uses adaptive mixed current decay to minimize audible motor noise and maximize step accuracy. Current in each phase of motor is controlled through DMOS full-bridge using synchronous rectification.
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