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Allegro IC drives 750mA stepper motors

Posted: 09 Jan 2003 ?? ?Print Version ?Bookmark and Share

Keywords:allegro microsystems? a3967? microstepping motor driver? bipolar stepper motor driver?

Allegro MicroSystems Inc. has introduced the A3967 microstepping motor driver IC that is targeted at bipolar stepper motors that run up to 30V and 750mA.

The 24-lead SOIC features the company's EasyStepper interface, which reduces the number of control lines from as many as eight lines down to two (STEP and DIRECTION). By inputting one pulse on the STEP input of the A3967, the motor will take one microstep. Programming of phase sequence tables, high frequency control lines, or complex interfaces are eliminated.

The device is designed to operate bipolar stepper motors in full, half, quarter, and eighth step modes. When a STEP signal occurs, the A3967 determines if that step results in a higher or lower current in each of the motor phases. If the change is a higher current, then the decay mode is set to slow decay. If the change is a lower current, then the decay mode will be set by the voltage at the percent-fast-decay (PFD) input.

Allegro claims that the current decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal circuit protection includes thermal shutdown with hysteresis, under-voltage lockout, and crossover current protection. Special power up sequencing is not required.

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