La National Semiconductor (www.national.com) en su Application Note LB-12 sugiere una gran cantidad de aplicaciones para el comparador de tensión0 LM111. De estas informaciones seleccionamos dos circuitos que pueden ser útiles para los lectores que buscan circuitos para ser usados en sensores. El primero es para foto-diodos y el segundo para transductores magnéticos.

El circuito integrado LM111 consiste en un comparador de tensión con salida compatible con lógica TTL y CMOS, además de otras.

En la figura 1 tenemos el circuito equivalente de este comparador, observándose que su salida es en colector abierto, necesitando por lo tanto de una resistencia pull-up de valor apropiado, normalmente de 2 a 10 k ohms, en las aplicaciones comunes.

 

 


| Haga click en la imagen para ampliar |

 

Otra característica que llama la atención en este comparador es que incluso operando con fuentes simétricas de 154 V, él puede conmutar cargas alimentadas por tensiones hasta 50 V con corrientes de 50 mA.

Esto permite que este comparador pueda excitar directamente cargas como relés.

Con alimentación de 5 V, por otro lado puede excitar directamente entradas TTL y DTL, microcontroladores además de CMOS.

Los circuitos que presentamos a continuación son sugeridos por el propio fabricante del circuito integrado.

 

Comparador para Foto-Diodo

El circuito presentado en la figura 2 utiliza como sensor un foto-diodo, pudiendo excitar directamente entradas lógicas MOS.

 


 

 

 

Observe que la alimentación se realiza con una tensión negativa de -10 V y que lo que sería positivo de la alimentación del circuito integrado está conectado a tierra.

El circuito cambia de estado cuando la corriente en el foto-diodo alcanza una intensidad de 1 uA. La tensión de salida conmuta entre 0 y - 10 V.

 

Sensor magnético

El circuito mostrado en la figura 3 emplea un sensor magnético, con salida compatible con la lógica TTL.

 


 

 

 

El control de balance garantiza la simetría de la señal producida por el circuito. La alimentación se realiza con una fuente simple de 5 V.

Recuerde que la ganancia de tensión del LM111 es 200 y el ventilador para TTL es 8. El consumo de potencia del circuito integrado es de 80 mW.

 

 

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