Dse Práctica De Aula (2009/03/23) Transistor Darlington

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Diseinu eta Simulazio Elektronikoa

PRACTICA DE AULA 2009-03-23 Transistor Darlington El Darlington es un transistor de alta ganancia de corriente que se compone de dos transistores conectados en cascada tal y como se muestra en la figura.

Circuito equivalente de pequeña señal del Darlington Para que la resolución de los ejercicios sea sencilla, utilizaremos el modelo más simple.

1

Diseinu eta Simulazio Elektronikoa

Adibidea

Transistoreen Q puntua kalkulatzeko, suposatu ezazu egoera egonkorrean Vi=0v dela.

ANALISIS EN CONTINUA Q1 eta Q2 aktiba egoeran suposatzen ditugu:

−0.7 − 0.7 −13⋅ IE 2 − (−20) = 0 −0.7 − 0.7 −13⋅ (1+ β ) ⋅ IB 2 − (−20) = 0 IB 2 =

−0.7 − 0.7 + 20 = 14.16µA 13⋅ (1+ 100)

⇒ IC 2 = β ⋅ IB 2 = 100 ⋅ 0.01416 = 1.416mA IB 2 = IE1 = (1+ β ) ⋅ IB1 ⇒ IB1 =

IB 2 0.01416 = = 0.1402µA 1+ β 1+ 100

⇒ IC1 = β ⋅ IB1 = 100 ⋅ 0.0001402 = 14.02µA



2

Diseinu eta Simulazio Elektronikoa 20 − 7 ⋅ ( IC1 + ⋅IC 2 ) − VCE 2 −13⋅ IE 2 − (−20) = 0 20 − 7 ⋅ (0.01402 + ⋅1.416) − VCE 2 −13⋅ ( IB 2 + IC 2 ) − (−20) = 0 VCE 2 = 11.4v > 0.2v = VCE 2,SAT VCE1 = VC1 − VE1 = 9.98 − (−0.7) = 10.7v > 0.2v = VCE 2,SAT VC1 = 20 − 7 ⋅ ( IC1 + ⋅IC 2 ) = 9.98v

€ SEINALE TXIKIKO ANALISIA

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