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Basic Electronics


           Well Come

  This presentation on zener diode

                                  19092
                            Khan.Xubair
Outlines
 Introduction of Zener Diode

 Construction of Zener Diode

 Working of Zener Diode

 Application of Zener Diode
 Numerical of Zener Diode
Introduction
The zener diode is a silicon pn junction devices that differs from rectifier
diodes because it is designed for operation in the reverse-breakdown
region. The breakdown voltage of a zener diode is set by carefully
controlling the level during manufacture. The basic function of zener
diode is to maintain a specific voltage across it’s terminals within given
limits of line or load change. Typically it is used for providing a stable
reference voltage for use in power supplies and other equipment.
Construction of Zener
Zener diodes are designed to operate in reverse breakdown. Two types of reverse
breakdown in a zener diode are avalanche and zener. The avalanche break down
occurs in both rectifier and zener diodes at a sufficiently high reverse voltage. Zener
breakdown occurs in a zener diode at low reverse voltages.
A zener diode is heavily doped to reduced the breakdown voltage.
This causes a very thin depletion region.
 The zener diodes breakdown characteristics are determined by the
doping process
Zeners are commercially available with voltage breakdowns of 1.8 V
to 200 V.
Working of Zener
A zener diode is much like a normal diode. The exception being is that it
is placed in the circuit in reverse bias and operates in reverse breakdown.
This typical characteristic curve illustrates the operating range for a zener.
Note that it’s forward characteristics are just like a normal diode.
Breakdown Characteristics
Figure shows the reverse portion of a zener diode’s characteristic
curve. As the reverse voltage (VR) is increased, the reverse current (IR)
remains extremely small up to the “knee” of the curve. The reverse
current is also called the zener current, IZ. At this point, the breakdown
effect begins; the internal zener resistance, also called zener impedance
(ZZ), begins to decrease as reverse current increases rapidly.
Zener diode Data Sheet Information




                          VZ: zener voltage
                          IZT: zener test current
                          ZZT: zener Impedance
                           IZK: zener knee
                          current IZM: maximum
                          zener           current
Ideal Model & Ideal Characteristic Curve of Zener Diode
Practical Model & Ideal Characteristic Curve of Zener Diode
Zener Diode Applications –
Zener Regulation with a Varying Input
Voltage
Zener Limiting
Zener diodes can used in ac applications to limit voltage swings to
desired levels.




 VZ: zener voltage
 Vd: Diode voltage
  Vd = 0.7
Numerical of Zener Diode
The end…….



     Thank You…..

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Special purpose diode

  • 1. Basic Electronics Well Come This presentation on zener diode 19092 Khan.Xubair
  • 2. Outlines  Introduction of Zener Diode  Construction of Zener Diode  Working of Zener Diode  Application of Zener Diode  Numerical of Zener Diode
  • 3. Introduction The zener diode is a silicon pn junction devices that differs from rectifier diodes because it is designed for operation in the reverse-breakdown region. The breakdown voltage of a zener diode is set by carefully controlling the level during manufacture. The basic function of zener diode is to maintain a specific voltage across it’s terminals within given limits of line or load change. Typically it is used for providing a stable reference voltage for use in power supplies and other equipment.
  • 4. Construction of Zener Zener diodes are designed to operate in reverse breakdown. Two types of reverse breakdown in a zener diode are avalanche and zener. The avalanche break down occurs in both rectifier and zener diodes at a sufficiently high reverse voltage. Zener breakdown occurs in a zener diode at low reverse voltages. A zener diode is heavily doped to reduced the breakdown voltage. This causes a very thin depletion region. The zener diodes breakdown characteristics are determined by the doping process Zeners are commercially available with voltage breakdowns of 1.8 V to 200 V.
  • 5. Working of Zener A zener diode is much like a normal diode. The exception being is that it is placed in the circuit in reverse bias and operates in reverse breakdown. This typical characteristic curve illustrates the operating range for a zener. Note that it’s forward characteristics are just like a normal diode.
  • 6. Breakdown Characteristics Figure shows the reverse portion of a zener diode’s characteristic curve. As the reverse voltage (VR) is increased, the reverse current (IR) remains extremely small up to the “knee” of the curve. The reverse current is also called the zener current, IZ. At this point, the breakdown effect begins; the internal zener resistance, also called zener impedance (ZZ), begins to decrease as reverse current increases rapidly.
  • 7. Zener diode Data Sheet Information VZ: zener voltage IZT: zener test current ZZT: zener Impedance IZK: zener knee current IZM: maximum zener current
  • 8. Ideal Model & Ideal Characteristic Curve of Zener Diode
  • 9. Practical Model & Ideal Characteristic Curve of Zener Diode
  • 10. Zener Diode Applications – Zener Regulation with a Varying Input Voltage
  • 11. Zener Limiting Zener diodes can used in ac applications to limit voltage swings to desired levels. VZ: zener voltage Vd: Diode voltage Vd = 0.7
  • 13. The end……. Thank You…..

Editor's Notes

  1. Fig. 3-9 Simple zener diode reg. circuit & label zener terminals
  2. Fig 3-3
  3. Fig 3-2 b zener curve
  4. Fig 3-16a,b,&c