Allegro MicroSystems, Inc. Introduces New Dual Full-Bridge Motor Driver ICs With Overcurrent Protection

Improved Microstepping Accuracy for High Reliability Designs

June 29, 2010

Product Image

Worcester, MA – Allegro MicroSystems, Inc. introduces two new motor driver ICs to complement their existing motor driver family. Allegro’s A4986/A4987 devices are dual DMOS full-bridge stepper motor drivers with parallel input communication and overcurrent protection. Each full-bridge output is rated up to 35 V and ±2 A. These devices include a fixed off-time pulse width modulation (PWM) current regulator, along with a 2-bit nonlinear DAC (digital-to-analog converter) that allows stepper motors to be controlled in full, half, and quarter step modes.

The PWM current regulator uses the Allegro patented mixed decay mode for reduced audible motor noise, increased step accuracy, and reduced power dissipation. Internal synchronous rectification control circuitry is provided to improve power dissipation during PWM operation. Industry standard PHASE, I0, I1 logic inputs are used to control each full-bridge so these motor drivers can replace most existing drivers. The outputs are protected from shorts between motor leads and short-to-ground events, which protect the driver and associated circuitry from thermal damage or flare-ups. Other protection features include thermal shutdown with hysteresis, undervoltage lockout (UVLO), crossover current and over-current protection. Special power-up sequencing is not required.

Allegro’s A4986 and A4987 are offered in several different package options: a 24 contact 4.0 mm × 4.0 mm × 0.75 mm QFN (ES) package, and a 24 lead 7.8 mm × 4.4 mm × 1.2 mm eTSSOP (LP) package. Both packages have exposed thermal pads for enhanced thermal dissipation, and are lead (PB) free with 100% matte tin plated lead frames.



Sobre Allegro

Allegro Microsystems, LLC es una empresa líder en el desarrollo, fabricación y comercialización de semiconductores de alto rendimiento. Las soluciones innovadoras de Allegro son útiles para aplicaciones de alto crecimiento dentro del mercado de la automoción, con enfoque adicional en la automatización de oficinas, industrial y soluciones de comunicaciones/consumo. Allegro tiene su sede en Worcester, Massachusetts (EE.UU.) con centros de diseño, aplicaciones y de soporte de ventas ubicados en todo el mundo. Más información sobre Allegro se puede encontrar en www.allegromicro.com

Allegro Microsystems Europa, con sede en Chertsey, Reino Unido, es la oficina operativa de ventas y comercialización europea, y opera una red de representantes y distribuidores en toda Europa. Allegro cuenta con centros técnicos y de marketing en Heidelberg y Hinterzarten en Alemania. Allegro también dispone de un centro de ingeniería de diseño en el centro de Edimburgo, en Escocia y un centro técnico y de marketing en Annecy en Francia.


Contactos de marketing:

Allegro MicroSystems Europe Ltd.
Tel: +33 (0) 4 50512359
Fax: +33 (0) 4 505 12083 

Email: allegroeurope@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