A3973 Datasheet - Allegro MicroSystems

A3973 Dual DMOS Full-Bridge Microstepping PWM Motor Driver

Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, the A3973 is capable of continuous output currents to ±1 A and operating voltages to 35 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to opera.

A3973 Dual DMOS Full-Bridge Microstepping PWM Motor Driver Discontinued Product This device is no longer in production. The device should not be purchased for new design applications. Samples are no longer available. Date of status change: November 1, 2010 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A3992. NOTE: For detailed information on purchasing options, contact your local Allegro field applications engineer or sal.

A3973 Features

* ▪ ±1 A, 35 V Continuous Output Rating ▪ Low RDS(on) DMOS Output Drivers ▪ Optimized Microstepping via 6-Bit Linear DACs ▪ Programmable Mixed, Fast, and Slow Current Decay Modes ▪ 4 MHz Internal Oscillator for Digital Timing ▪ Serial-Interface Controls Chip Functions ▪ Synchronous Rectification for L

A3973_AllegroMicroSystems.pdf