PWM Microstepping Driver IC offers synchronous rectification.

Press Release Summary:




Designed to drive one winding of bipolar stepper motor in microstepping mode, full-bridge A4975 features outputs rated for continuous output currents to ±1.5 A and operating voltages to 50 V. Internal PWM current control, combined with internal 3-bit nonlinear DAC, allows motor current to be controlled in full-, half-, quarter-, or eighth-step modes. Internal circuitry determines whether PWM current-control circuitry operates in recirculating, regenerative, or mixed current-decay mode.



Original Press Release:



Allegro MicroSystems, Inc. Introduces New Full-Bridge PWM Microstepping Driver with Synchronous Rectification to Lower IC Power Dissipation



Worcester, MA - Allegro MicroSystems, Inc. introduces a new motor driver IC designed to drive one winding of a bipolar stepper motor in a microstepping mode. The outputs of Allegro's A4975 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 (microstepping) modes. Nonlinear increments minimize the number of control lines necessary for microstepping. Microstepping provides increased step resolution, and reduces torque variations and resonance problems at low speed. This new device is targeted at the office automation and industrial markets with specific end applications to include printers, scanners and copiers.

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 and 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, an undervoltage monitor, and crossover-current protection. Special power-up sequencing is not required.
The A4975 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 internally fused pins (suffix LB). For both package styles, the thermally enhanced pins are at ground potential and need no electrical isolation. Both packages are lead (Pb) free, with leadframe plating 100% matte tin.

The A4975SB-T and A4975SLBTR-T are priced at $1.70 in quantities of 1,000.

Allegro MicroSystems, Inc. is a leader in developing, manufacturing and marketing high-performance semiconductors. Allegro's innovative solutions serve high-growth applications within the automotive market, with additional focus on office automation, industrial, and consumer/communications solutions. Allegro is headquartered in Worcester, Massachusetts (USA) with design, applications, and sales support centers located worldwide. Further information about Allegro can be found at www.allegromicro.com.

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