Allegro MicroSystems A3973
the A3973 is capable of continuous output currents to ±1 A and operating voltages to 35 V. The desired load-current level is set via the serial port with two 6-bit linear DACs in conjunction with a reference voltage. The six bits of control allow maximum flexibility in torque control for a variety of step methods, from microstepping to full-step drive.| Part No. | A3973 |
|---|---|
| Datasheet | A3973 Download |
| Manufacturer |  Allegro MicroSystems |
| Description | Dual DMOS Full-Bridge Microstepping PWM Motor Driver |
| Buy | Stock & Price |
FEATURES AND BENEFITS
● ±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 Low Power Dissipation
● Internal UVLO and Thermal Shutdown Circuitry
● Crossover-Current Protection
● Precision 2 V Reference
● Inputs Compatible with 3.3 or 5 V Control Signals
● Sleep and Idle Modes Packages: Package B, 24-pin DIP with two batwing power tabs Not to scale Package LB, 24 pin SOICW with 4 fused leads
DESCRIPTION
Designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors, Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. Load current is set in 1.56% increments of the maximum value. Synchronous rectification circuitry allows the load current to flow through the low RDS(on) of the DMOS output driver during the current decay.
