Los reguladores de tensión de 5 a 15 V para corrientes de 1 A, se pueden obtener fácilmente en forma de circuitos integrados. Este es el caso de la serie 78xx. Esta fuente puede suministrar de 5 a 15 V de tensión de salida según el CI utilizado. El "xx" indica la tensión de salida. Por ejemplo, el circuito integrado 7806 proporciona una tensión de 6 V. En la siguiente figura tenemos la configuración básica para esta fuente de alimentación. Observamos algunos hechos importantes sobre este circuito, que pueden ser de gran utilidad para el desarrollador. Existen versiones con sufijos “L” que se presentan en envolventes SOT-54 para corrientes hasta 200 mA. Se pueden usar en los casos en que queramos una corriente de salida menor. Los capacitores de desacoplamiento de salida pueden tener valores más bajos en algunos casos, dependiendo del sufijo del CI y del fabricante. El circuito integrado del regulador de tensión debe estar equipado con un radiador de calor. El transformador debe tener una tensión secundaria de al menos 2 V mayor que la que queremos en la salida, dada por el regulador integrado utilizado. La corriente debe subir a 1 A como se desee en la salida. La tensión de trabajo de C1 debe ser al menos un 60% superior a la tensión eficaz del secundario del transformador.

 

Fuente fija de 1A con circuito integrado
Fuente fija de 1A con circuito integrado

 

 

 

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