FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER
A3955 Full-Bridge PWM Microstepping Motor Driver
Features and Benefits
▪ ±1.5 A continuous output current ▪ 50 V output...
Description
A3955 Full-Bridge PWM Microstepping Motor Driver
Features and Benefits
▪ ±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 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 full-, half-, quarter-, or eighth-step (microstepping) modes. Nonlinear increments minimize the number of control lines necessary ...
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