Product category: Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3967
Edited by the Electronicstalk Editorial Team on 21 January 2003
Microstepping driver IC
has built-in translator
The A3967 from Allegro MicroSystems is a low-cost stepper-motor driver IC that uses Allegro's EasyStepper translator technology to provide microstepping (one-eighth step) operation
The A3967 from Allegro MicroSystems is a low-cost stepper-motor driver IC that uses Allegro's EasyStepper translator technology to provide microstepping (one-eighth step) operation for office automation, industrial and medical applications. The EasyStepper interface reduces the number of control lines from as many as eight lines down to just two: step and direction.
This article was originally published on Electronicstalk on 21 January 2003 at 8.00am (UK)
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Operation involves simply inputting one pulse on the step input of the A3967 for the motor to take one microstep, without the need for phase-sequence tables, high-frequency control lines, or complex interfaces to program.
The device is ideally suited to applications where a complex microprocessor is unavailable or over-burdened.
The critical microstepping control is integrated into the driver IC, providing a motor driver that can run independently of a microprocessor.
The A3967 is designed to operate bipolar stepper motors in full-, half-, quarter- and eighth-step modes, with output drive capability of 30V and +/-750mA.
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 to a higher current, the decay mode is set to slow decay.
If the change is to a lower current, the decay mode will be set by the voltage at the device's percent-fast-decay (PFD) input.
This 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.
The A3967 also uses Allegro's patented Satlington sink drivers to achieve low output saturation voltages.
The Satlington output structure combines the low voltage drop of a saturated transistor with the high current capability of a Darlington driver.
Also included is a fixed off-time current regulator that has the ability to operate in slow, fast or mixed-decay modes, with mode selection being carried out automatically by the chopping control.
The A3967 is offered in a 24-lead plastic SOIC with a copper batwing tab.
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