Allegro MicroSystems, Inc. Introduces Automotive Grade Programmable Bipolar Stepper Motor Driver ICs

March 8, 2011

Product Image

Worcester, MA - Allegro MicroSystems, Inc. introduces two new flexible microstepping motor drivers each with a built-in translator for easy operation. They both encompass a single-chip solution, designed to operate bipolar stepper motors in full-, half-, quarter- and sixteenth-step modes, at up to 28 V and ±1.4 A. The A3981 and A4980 devices are targeted at the automotive, consumer and industrial markets.

The A3981 can be controlled by simple Step and Direction inputs, or through the SPI-compatible interface that also can be used to program many of the integrated features and to read diagnostic information. The A4980 is identical to the A3981 except for a low-voltage operation feature which will allow the IC to run down to a load supply voltage of 3.3 V (7 V on the A3981.) This low voltage operation can be a necessary feature in some automotive applications where the battery voltage during cold cranking can drop critically low.

The current regulator can be programmed to operate in fixed off-time or fixed frequency PWM, with several decay modes to reduce audible motor noise and increase step accuracy. In addition the phase current tables can be programmed via SPI to create unique microstep current profiles to further improve motor performance for specific applications.

The current in each phase of the motor is controlled through a DMOS full bridge, using synchronous rectification to improve power dissipation. Internal circuits and timers prevent cross-conduction and shoot-through, when switching between high-side and low-side drives. The outputs are protected from short circuits, and features for low load current and stalled rotor detection are included. Chip-level protection includes: hot and cold thermal warnings, overtemperature shutdown, and overvoltage and undervoltage lockout.

The A3981 and A4980 are supplied in a 28-pin TSSOP power package with an exposed thermal pad (package type LP). This package is lead (Pb) free with 100% matte-tin leadframe plating.



Über Allegro MicroSystems

Allegro MicroSystems Inc. ist ein führendes Unternehmen bei der Entwicklung, Fertigung und Vermarktung von leistungsfähigen Power- und Halleffekt-Sensor-ICs. Die innovativen Lösungen von Allegro zielen auf die Wachstumsmärkte in den Bereichen Automobilelektronik, Kommunikation, Computer/Büroautomatisierung, Konsumer- und Industrieelektronik. Allegro hat seinen Firmensitz in Worcester, MA, USA mit Design- und Applikationszentren in Nord- und Südamerika, Asien und Europe. Weitere Informationen findet man unter: www.allegromicro.com.

Allegro MicroSystems Europe hat seinen Firmensitz in Chertsey, Großbritannien, und stellt die europäische Vertriebs- und Marketing-Niederlassung dar. Von hier aus wird ein Netzwerk von Repräsentanten und Distributoren in Europa geführt. Allegro unterhält außerdem Applikations- und Marketingzentren in Heidelberg, Deutschland sowie in Annecy, Frankreich. Hinzu kommt ein Entwicklungszentrum in Edinburgh, Schottland.


Pressekontakt

Allegro MicroSystems Germany GmbH
Tel: +49 (0) 6221 8723 5
Email: info.germany@allegromicro.com
www.allegromicro.com

.

Copyright © 2017 Allegro MicroSystems, LLC

Sitemap  |  Privacy Policy  |  Contact Webmaster

Follow us on: LinkedIn YouTube Google+ Follow Allegro on Twitter

Careers   |   Contact Sales   |   Home   |   Legal   |   Quality & Environment   |   Request Samples