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The A3955SB and A3955SLB-T are designed for driving one winding of a bipolar stepper motor in a micro stepping mode. The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50 V. Internal pulse-width modulated (PWM) current control combined with an internal three-bit nonlinear digital-to-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eighth-step (micro stepping) modes.
The A3955SB and A3955SLB-T are designed for driving one winding of a bipolar stepper motor in a micro stepping mode. The outputs are rated for continuous output currents to ±1.5 A and operating voltages to 50 V. Internal pulse-width modulated (PWM) current control combined with an internal three-bit nonlinear digital-to-analog converter allows the motor current to be controlled in full-, half-, quarter-, or eighth-step (micro stepping) modes. Nonlinear increments minimize the number of control lines necessary for micro stepping. Micro stepping provides for increased step resolution, and reduces torque variations and resonance problems at low speed. Internal circuitry determines whether the PWM current-control circuitry operates in a slow (recirculating) current-decay mode, fast (regenerative) current-decay mode, or in a mixed current-decay mode in which the off time is divided into a period of fast current decay with the remainder of the fixed off time spent in slow current decay. The combination of user-selectable current-sensing resistor and reference voltage, digitally selected output current ratio; and slow, fast, or mixed current-decay modes provides users with a broad, variable range of motor control. Internal circuit protection includes thermal shutdown with hysteresis, transient-suppression diodes, and crossover current protection. Special power-up sequencing is not required. The A3955S— is supplied in a choice of two power packages; a 16-pin dual-in-line plastic package with copper heat-sink tabs (suffix ‘B’), and a 16-lead plastic SOIC with copper heat-sink tabs (suffix ‘LB’). For both package styles, the power tab is at ground potential and needs no electrical isolation. Both packages are available in a lead-free version (lead frame plating 100% matte tin), indicated by suffix -T. Datasheet: PDF Features: