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V - Cours - École 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 />

c) Calcul <strong>de</strong> ΔV o pour R L =2kΩ<br />

Le courant dans la charge est :<br />

6.8<br />

IL<br />

= 3.4mA<br />

2<br />

Donc ΔI = − I =−3.4mA<br />

On a : Δ V = r ΔI<br />

0<br />

Z<br />

0<br />

Z<br />

⇒Δ V = 20 × ( − 3.4) = 68mV<br />

L<br />

Z<br />

Microelectronic Circuits – Fifth Edition<br />

Copyright © 2004 by Oxford University Press, Inc.<br />

ELE2302 – Chap. 2 : Dio<strong>de</strong>s - Applications 10<br />

© A. Khouas, 2005

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