Product category: Power Supply ICs and Controllers
News Release from: Allegro MicroSystems Europe | Subject: A3980
Edited by the Electronicstalk Editorial Team on 4 November 2003
DMOS microstepping driver
has built-in translator
The A3980 is a complete DMOS microstepping motor driver integrated circuit with a built-in translator for easy operation
The new device from Allegro Microsystems is designed to operate bipolar stepper motors in full, half, eighth and sixteenth step modes, at up to 35V and +/-1 A, respectively, making it suitable for automotive stepper applications such as engine management and headlamp positioning. An internal fixed off-time current regulator operates in slow, fast or mixed decay modes, resulting in reduced audible motor noise, increased step accuracy and reduced power dissipation.
This article was originally published on Electronicstalk on 4 November 2003 at 8.00am (UK)
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The built-in translator means that simply inputting one pulse on the step input causes the motor to take one microstep.
There are no phase sequence tables, high-frequency control lines or complex interfaces to program.
As a result, the A3980 is ideally suited to applications where a complex microprocessor is unavailable or over-burdened.
Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM (pulsewidth-modulated) operation.
Internal circuit protection includes thermal shutdown with hysteresis, overvoltage and undervoltage lockout, and crossover current protection.
Special power-up sequencing is not required.
Two diagnostic fault flags provide indication of short circuits or open circuits on the motor windings.
The device operates over a logic supply voltage range from 3.0 to 5.5V, and has low typical on resistance outputs of 0.67ohm (source) and 0.54ohm (sink).
The A3980 is supplied in a low-profile (1.1mm) 28L eTSSOP with exposed power tab.
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