A3955 - Allegro MicroSystems

A3955 FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

The A3955 is designed to drive one winding of a bipolar stepper motor in a microstepping mode. The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50V. Internal pulse width modulated (PWM) current control combined with an internal three-bit nonlinear digitalto-analog converter allows the motor current to be controlled in .

Features

▪ ±1.5 A continuous output current ▪ 50 V output voltage rating ▪ Internal PWM current control ▪ 3-bit nonlinear DAC ▪ Fast, mixed fast/slow, and slow current-decay modes ▪ Internal transient-suppression diodes ▪ Internal thermal shutdown circuitry ▪ Crossover-current and UVLO protection Packages: Package B, 16-pin DIP with exposed tabs Package LB, 16-pin SOIC with internally fused pins Not to scale Description The A3955 is designed to drive one winding of a bipolar stepper motor in a microstepping mode. The outputs are rated for continuous output currents to ±1.5 A and operating voltages.