V - Cours - Ãcole Polytechnique de Montréal
V - Cours - Ãcole Polytechnique de Montréal
V - Cours - Ãcole Polytechnique de Montréal
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Régulateur <strong>de</strong> tension (dio<strong>de</strong> Zener)<br />
Exemple d’un régulateur <strong>de</strong> tension<br />
Caractéristiques <strong>de</strong> la dio<strong>de</strong> : 6.8V-5mA avec I ZK<br />
=0.2 mA et r Z<br />
=20 Ω.<br />
a) Calcul <strong>de</strong> V o sans la charge<br />
1- Calcul <strong>de</strong> V , on a : 6.8 = V + 20×<br />
0.005<br />
Z 0<br />
Z0 Z0<br />
⇒ V = 6.8 − 0.1 = 6.7V<br />
2- Calcul <strong>de</strong> V sans charge : V = V<br />
I<br />
Z<br />
0 0 Z 0 Z Z<br />
V −V<br />
10 − 6.7<br />
R+ r 500 + 20<br />
+<br />
Z 0<br />
= = =<br />
On a : V = V + r I<br />
0<br />
Z<br />
0 Z0<br />
Z Z<br />
⇒ V = 6.7 + 20× 6.35 = 6.83V<br />
6.35mA<br />
Microelectronic Circuits – Fifth Edition<br />
Copyright © 2004 by Oxford University Press, Inc.<br />
ELE2302 – Chap. 2 : Dio<strong>de</strong>s - Applications 8<br />
© A. Khouas, 2005<br />
+<br />
r I