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UJT y PUT - Problemas básicos resueltos
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Ejercicios básicos para el calculo del disparo mediante UJT / PUT
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Circuitos electrónicos analógicosProblemas Con UJT y PUT
Ejercicios resueltos
1º Dado el circuito de la figura, dibujar las formas de onda de la tensión en el
condensador y en la salida.
Datos UJT 2N2646: µ = 0.6; rBB = 6KΩ, ;VV = 1,5V; IV = 5mA, ;IP = 5µA;
VP VBB VD 0,6.15 0,5 9,5V
Cálculo de la frecuencia:
Si llamamos ttotal al periodo de carga y descarga de C, podemos descomponerlo en:
ttotal = tON + tOFF
tOFF = Tiempo o periodo de carga de C, durante el cual, el UJT está bloqueado.
tON = Tiempo o periodo de descarga de C.
Normalmente, tOFF >> tON, por tanto podemos despreciar el valor de t ON
(comprobándolo posteriormente). Si partimos de la solución de la ecuación diferencial de
carga de un condensador a partir de una tensión continua:
t
VC (t) VC (final) VC (inicial) VC (final) e R C
VC(t) = Tensión instantánea en C.(VP)
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