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Dispozitive electronice

Tema 4

Tipuri speciale dediode

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Dioda Zener – Simboluri şi caracteristică

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Dioda Zener – mărimi caracteristice

UZ – tensiunea Zener 

- minimă

- tipică

- maximă

IZ – curentul de măsurăUFmax – tensiunea directă

maximă

IFmax – curentul direct maxim

r Z – rezistenţa Zener 

αT – coeficientul detemperatură al tensiunii

(mV/ºC)

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Dioda Zener – Modele aproximative

20 40

820

1030

 Z 

 Z 

U V 

 R

U V 

r 

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Dreapta de sarcină

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18

10270

1

8,5

 Z 

S 

 Z 

U V 

U V  R

 R k 

r 

12

10

270

2

8, 5

 Z 

S 

 Z 

U V 

U V 

 R

 R k 

r 

2r 

U V 

Aplicaţie

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Circuite de limitare

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Dioda luminiscentă (LED)

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Culoare Tensiune

Infraroşu 1.6 V

Roşu 1.8 V to 2.1 V

Orange 2.2 V

Galben 2.4 V

Verde 2.6 V

 Albastru 3.0 V to 3.5 V

 Alb 3.0 V to 3.5 V

Ultraviolet 3.5 V

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Fotodioda

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Optocuplorul

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Dioda varicap

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