Update: 28 September, 2023
The A3972SB is a dual DMOS full-bridge micro-stepping PWM motor driver designed for pulse-width modulated (PWM) current control of bipolar microstepping stepper motors. It is capable of continuous output currents to ±1.5 A and operating voltages to 50 V. The driver features internal fixed off-time PWM current-control timing circuitry that can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes. 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. Load current is set in 1.56% increments of the maximum value. The driver also includes synchronous rectification circuitry, which allows the load current to flow through the low rDS(on) of the DMOS output driver during the current decay. This eliminates the need for external clamp diodes in most applications, saving cost and minimizing power dissipation. The driver features internal circuit protection, including thermal shutdown with hysteresis, transient-suppression diodes, and crossover-current protection. Special power-up sequencing is not required. The A3972SB is supplied in a 24-lead plastic DIP with a copper batwing power tab. The lead (Pb) free version has 100% matte tin leadframe plating.
File format: PDF
Size: -
MD5 Checksum: 0931CBD0E315FBE87F3302AFEA549D82
Publication date: 03 August, 2012
Downloads: -
PDF Link: Allegro 3972 Dual Protected PWM Motor Driver handbook(1) PDF