As a result zener diode circuits are often used in power supplies when regulated outputs are needed. The zener diode has a welldefined reversebreakdown voltage, at which it. And our comprehensive selection of electrical parameter, package and configuration. First, we must replace the zener diode with an appropriate model. The forward characteristics of zener diode are similar to that of normal pn.
A zener diode is a silicon semiconductor device that permits current to flow in either a forward or reverse direction. Chapitre 3 diodes speciales technologue pro, cours. The zener diode is a form of semiconductor diode that is widely used in electronics circuits as a voltage reference. For this reason, they are also referred to as voltageregulator diodes. Carefully replacing the zener diode with this model, we find that we are left with an ideal diode circuit. A zener diode is a type of diode that allows current to flow in the conventional manner from its anode to its cathode i. When a zener diode is reversed biased, theres a different voltage drop.
Pdf zener diode pdf zener diode pdf zener diode download. Zener diodes are often used to regulate power supply voltage, that is, produce a voltage level that is constant even when the supplys voltage varies. Zener diode operation and applications ece tutorials. Pdf zener diode today we will discuss about a special diode known as zener diode.
In order to understand zener diode operation let us first recall the vi characteristic of a. The diode consists of a special, heavily doped pn junction, designed to conduct in the reverse direction when a certain specified voltage is reached. In a dc circuit, zener diode can be used as a voltage regulator or to provide voltage reference. V z0 is the voltage at which the straightline approximation of the iv characteristic intersects the horizontal axis. The zener diode working principles and its various applications. Telecharger gratuitement cours en pdf sur les diodes diodes zener, diodes schottky, diodes varicaps,formation sur 7 pages pour debutants. Zener diodes are silicon diodes specifically constructed to operate in what is known as the breakdown region. A zener diode is like an ordinary diode only that it has been doped to have a sharp a breakdown voltage. A zener diode is constructed for operation in the reverse breakdown region. The very steep portion in the reverse biased iv characteristic curve is. This section consists of both the expected and measured experiment results of the zener and regulator power supplies.
When a zener diode of zener voltage vz is connected in reverse direction parallel to the load, it maintains a constant voltage across the load equal to vz and hence stabilizes the output voltage. Exercices corriges slideshare utilise les cookies pour ameliorer les fonctionnalites et les performances, et egalement pour vous montrer des publicites pertinentes. On utilise alors cette diode en polarisation inverse. Scribd is the worlds largest social reading and publishing site. The zener diode maintains a stable output voltage irrespective of the input voltage provided the maximum zener current is not exceeded. E ective v ripple mv peak v ripple mv calculated 12. Jun 17, 2015 a zener diode is like a normal silicon diode, where a forward biased diode will pass current with a 1 volt drop. As a rough rule of thumb, this can be around 5 to 10 ma for a typical leaded 400 mw device. Les diodes zener sont appreciees pour leur tension vz stable. The symbol of zener diode is shown in the figure below. Redresseur monophase simple alternance cours en pdf.
The vi characteristics of a zener diode is as shown in the figure below. Zener diodes are in stock with sameday shipping at mouser electronics from industry leading manufacturers. Zener diodes compact protection for high density circuits you can use our zener diodes to provide regulation functions in most of your electronic applications. A zener diode is a special type of device designed to operate in the zener breakdown region. While offering a cheaper alternative to ic solutions, zeners give you customized, effective protection in small scale, high density circuit designs. This article will help to explain the characteristics which make up zener diodes, specifically how the voltage across a zener diode varies with the current flowing through it. Mouser is an authorized distributor for many zener diode manufacturers including central semiconductor, diodes inc, microsemi, nexperia, on semiconductor. Ce cours traitera essentiellement les points suivants. The zener diode working principles and its various. Diodes zener single discrete semiconductor products. When connected in forward bias, the zener diode behaves exactly like the normal silicone diode. Les inducteurs 4 des didacticiels en pdf sur des inductances, inductance, inductance mutuelle et des astuces pour les connecter ensemble.
The zener diode or voltage reference diode is an electronic component that provides a stable and defined voltage. On peut utiliser des diodes zener pour reguler une tension avec une resistance. A heavily doped semiconductor diode which is designed to operate in reverse direction is known as the zener diode. The main use of zener diode lies in the fact that the voltage across a zener diode remains constant for a larger change in current. The iv characteristics curve of a zener diode, shown below, is the curve which shows the current. The maximum voltage rating specifies how much reverse voltage a diode can withstand before breakdown occurs. Assuming that the zener will either be in breakdown or reverse bias, a good choice would be the zener cvd model. Pdf diodes et diodes zener cours informatique en pdf. For large levels of power the shunt regulators are usually found as it is very ineffective, but they are very efficient for low power level. Typically there is also a minimum current required for the operation of the diode. Discrete semiconductor products diodes zener single are in stock at digikey. Zener diodes acts like normal pn junction diodes under forward biased condition.
Pdf cours et exercice dapplication avec correction sur. The zener diode controls the voltages appearing around load letting a part of current to run through the diode and dodge the load to sustain the voltage around it. In the reverse bias condition the zener diode is an open circuit and there is only a small leakage current in the microampere range. The zener voltage will only be generated over a specific current range. Schema equivalent a une diode zener polarisee en inverse. The current, izm, of a zener diode is the maximum current that can flow through a zener diode at its rated voltage, vz. Pdf diode zener cours et exercices corriges en pdf eng. Pour une bonne maitrise des fonctionnalites du diode zener, telechargez gratuitement ce cours avec exercices sous format pdf et apprenez les bases pour. Cours sur le redressement simple alternance en pdf. Z ener diode as the name suggests is a two terminal device with two terminals being anode p and cathode n.
And the zener voltage will vary slightly over this. In other words, the diode which is specially designed for optimising the breakdown region is known as the zener diode. Telecharger des cours et exercices corriges delectronique en pdf,formation pour tout les niveaux dans les divers themes. Formation sur les diodes et les transistors, cours en pdf sur 32 pages a telecharger gratuitement. Zener diode voltage regulators 2 the forward bias region of a zener diode is identical to that of a regular diode. As the breakdown voltage is approached the current will begin to avalanche. When forward biased voltage is applied to the zener diode it allows large amount of electric current and blocks only a. Pdf introduction sur les diodes cours informatique en pdf. Applications of zener diodes voltage regulator, meter. Zener diodes are generally employed in multimeters to protect the meter movement against the damage from the accidental overloads. When the voltage across the terminals is reversed and the potential reaches the zener voltage or knee, the junction will break down and current will flow in the.
1415 513 1184 328 197 1375 1337 334 11 1528 1418 1168 347 1188 482 605 642 298 627 147 1486 1152 362 1174 622 696 1363 1504 1492 994 882 1077 518 1023 503 1582 1173 1173 1326 1403 1332 1088 657