Raychem (www.raychem.co.jp) es una división de Tycho Electronics especializada en componentes para protección eléctrica. Entre los productos de esta empresa destacamos los dispositivos PolyZen (www.circuitprotection.com) para la protección de circuitos electrónicos.

Una aplicación importante de estos dispositivos es en la protección de USB, que puede suministrar alimentación para dispositivos externos entre 4,75 y 5,25 V con corriente hasta 500 mA.

Sin embargo, en una red USB puede ocurrir la inducción de transitorios, brotes ya sea por procesos inductivos o electrostáticos capaces de causar daños a los dispositivos conectados. Las muñecas que sobrepasen 8 V son peligrosas para la integridad de cualquier circuito conectado a un USB.

La inducción de pulsos peligrosos también puede ocurrir cuando los dispositivos conectados a esa red se encienden o se apagan.

Otro peligro para el USB es que existen convertidores AC / DC con salida USB que están dotados de una protección contra transitorios y otros problemas bastante dudosos.

El dispositivo PolyZen ZEN056V130A24LS está especialmente diseñado para proteger los periféricos USB y los dispositivos que se alimentan con el bus de 5 V del ordenador.

La tensión VZ en 100 mA se ha seleccionado para situarse entre 5,5 V y 5,75 V para ayudar a proteger los dispositivos sensibles contra picos y transitorios. El dispositivo desvía la corriente a la tierra ayudando con ello a mantener la tensión en el valor correcto.

El dispositivo tiene un diseño especialmente diseñado para tener en cuenta los pulsos producidos por circuitos inductivos. El diodo zener del dispositivo también ayuda a cortar las variaciones de la tensión y la suciedad de la alimentación y eventualmente desconectando una fuente de alimentación defectuosa.

En la figura 1 tenemos circuitos típicos de utilización de ese componente.

 


 

 

 

Destacados:

• Supresión de transitorios de sobretensión

• Vz estable

• Capacidad de manejo de potencia del orden de 100 W

• Compatible con RoHS

 

Entre las aplicaciones posibles, además de USB destacamos:

• teléfonos móviles

• PDAs

• Reproductores MP3

• Reproductores de DVD

• Cámaras digitales

• Impresoras

• Escáneres

• Discos duros.

 

 

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