A normal pn junction diode does not operate in breakdown region because the. In this video, the basics of zener diode is explained and how the zener diode can be used as a voltage regulator in the various circuit is explained with solved examples. This manual was prepared to acquaint the engineer, the equipment designer and. Currentvoltage characteristic of a zener diode with a breakdown voltage of 17 volt. The reverse breakdown region is the vi characteristic of zener diode above zener breakdown voltage. For most applications the zener diode is operated well into. After certain reverse voltage across the junction, the minority carriers get sufficient kinetic energy due to the strong electric field.
When high reverse voltage is applied to the pn junction diode, the free. Zener diode operation the zener diode operates just like the normal diode when in the forwardbias mode, and has a turnon voltage of between 0. A zener diode is a type of diode that permits current to flow in the forward direction like a normal. In this physics video in hindi for class 12 we explained, with diagram, how zener diode is used as voltage regulator. A zener diode is a type of diode that allows current to flow in the conventional manner from its anode to its cathode i. Zener diode operation and applications ece tutorials. This manual was prepared to acquaint the engineer, the equipment designer. The forward characteristics of zener diode are similar to that of normal pn junction diode. The symbol of zener diode is shown in the figure below. The nominal operation voltage of a zener diode is also known as the breakdown voltage of the zener diode, depending on the application for which the diode is to be used, this is often the most important criteria for zener diode selection. However, when connected in the reverse mode, which is usual in most of its applications, a small leakage current may flow.
Zener diode is popularly used as shunt regulator or voltage regulator. Zener diode theory introduction the zener diode is a semiconductor device unique in its mode of operation and completely unreplaceable by any other electronic device. As we have gone through the first part of the article we know what is zener diode and what is the basic principle of operation. The zener diode structure is optimised to ensure the required performance this entails some differences to the structure of an ordinary diode. Zener diode working with circuit diagram and applications. It provides, among other useful functions, a constant voltage reference. From the iv characteristics curve above, we can see that the zener diode has a region in its reverse bias characteristics of almost a constant negative voltage regardless of the value of the current flowing through the diode. The zener diode is used in its reverse bias or reverse breakdown mode, i. Zener diode definition, vi characteristics, and breakdown in zener. In this interactive and animated object, learners examine the operation of a semiconductor diode when it is forward and reverse biased. Click here to visit the playlist on this chapter s.
The zener diode utilises the same basic structure as an ordinary diode, but the concept of operation of the reverse breakdown effects are not normally wanted or used for normal diode operation. A zener diode is a pn junction semiconductor device that is designed to operate in. The zener diode working principles and its various. Here the question arises where this type of diodes can be useful. The vi characteristics of a zener diode is as shown in the figure below. Hbd854 zener theory and design considerations handbook. The function of a voltage regulator is to provide a constant output voltage to a load connected in parallel with it in spite of the ripples in the supply voltage or. Zener diode as voltage regulator tutorial electronicstutorials. This represents the maximum amount of power the zener current can dissipate. Chanzon 1w zener diode assorted kit 30 values x 10pc 3v 3. 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 reverse direction a desired characteristic.
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