La Linear Technology (www.linear.com) posee en su línea de componentes el LT3518, recientemente lanzado, que consiste en un controlador para LEDs capaz de suministrar una corriente de salida de 2,3 A. Además de ya incluir una llave interna de 2 , 3 V x 45 V, este componente tiene una gama de ajustes de intensidad PWM True Color de 3000: 1, y un sensor de corriente de gama alta de 100 mV. Otras características del circuito integrado son su rango de frecuencias de conmutación ajustable entre 250 kHz y 2,5 MHz y una protección contra LED abierto. El rango de tensiones de operación va de 3 V a 30 V. El circuito puede operar en modo de impulso, buck o buck-boost. El circuito cuenta además con protección contra transitorios hasta 40 V. En la figura tenemos el circuito de aplicación sugerido por Linear, el cual puede ser empleado en iluminación de fondo, paneles para uso automotriz, iluminación y escáneres. La eficiencia del circuito supera el 90%. Más información sobre el LT3518, incluyendo diferentes circuitos de aplicación se pueden obtener en el datasheet disponible en formato PDF en el sitio web de la empresa.

 


 

 

 

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