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Control IC del ventilador que impulsa viento ecológico


News provided by

Melexis NV

Jul 26, 2011, 09:00 ET

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TESSENDERLO, Bélgica, July 26, 2011 /PRNewswire/ --

Melexis lanza hoy su solución súper-inteligente para los diseños de ventiladores eficientes. El MLX90287 proporciona un efecto Hall totalmente integrado, robusto y de alto rendimiento basado en el controlador IC del ventilador, con la capacidad de controlar la velocidad del ventilador empleando PWM o señales analógicas. Este dispositivo se beneficiará del equipamiento de tecnología de la información como ordenadores de sobremesa, consolas de juegos y también ventiladores, en aplicaciones automovilísticas, como faros LED.

MLX90287 se caracteriza por una solución de un chip para controlar el bajo nivel de ruido controlando la velocidad de una sola bobina de ventiladores de refrigeración sin escobillas. Con una tensión de alimentación de funcionamiento de 4,5 V a 16 voltios, MLX90287 tiene como objetivo las ampliamente utilizadas aplicaciones de ventiladores de "12 voltios". Con la fase de potencia integrada, los ventiladores de refrigeración nominal de hasta 550mA (continua) pueden ser fácilmente empleados en la mayoría de las aplicaciones. El dispositivo es incluso capaz de operar a una temperatura ambiente de -40 a 150 grados centígrados, lo que es adecuado para ambientes hostiles como automóviles, industrial, militar y aeroespacial.

El último paso en el diseño de refrigeración energéticamente eficiente es controlar y optimizar la velocidad de rotación del ventilador en función de la carga del sistema térmico. Tomando el ejemplo de un procesador informático, mientras que el trabajo habitual de oficina crea el sistema de carga baja, por el contrario, los juegos 3D requieren la mayor carga del sistema. Por lo tanto, mantener constantemente la capacidad máxima de enfriamiento conduce a un desperdicio de energía y alto ruido acústico desde el flujo de aire del ventilador.

MLX90287 proporciona una solución simple para controlar la velocidad del ventilador a través de técnicas digitales o analógicas. Las últimas arquitecturas de enfriamiento para el enfriamiento de la CPU utilizan pulso de alta frecuencia de señal de modulación ancha (PWM) donde el ciclo de trabajo aplicado es proporcional a la velocidad de enfriamiento deseado. A diferencia de otras soluciones, MLX90287 acepta directamente, sin circuito externo, un amplio rango de frecuencia PWM desde 100Hz a 100KHz. Esto se adapta perfectamente a los últimos sistemas de uso de 25 KHz o más y sistemas más antiguos con menor frecuencia aún. Otras arquitecturas usan señales analógicas o sensor de control uniforme de la temperatura. El MLX90287 puede regular la velocidad del ventilador a  través de un potenciómetro simple, una solución utilizada por muchos desarrolladores más exigentes para un control total, o incluso un termistor sencillo para una regulación más automática de respuesta de la temperatura real del sistema.

Más información online en: http://www.melexis.com/mlx90287

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