Basic Electrical and Electronics Engineering: Unit III: Analog Electronics
Zener Diode
Construction, Symbol, Circuit diagram, Biasing, Applications
A zener diode is also called a voltage reference, voltage regulator (or) break down diode.
ZENER
DIODE
A
zener diode is also called a voltage reference, voltage regulator (or) break
down diode.
The
zener diode is a silicon PN junction device which differs from a rectifier
diode, in the sense, that it is operated in the reverse break down region.
The
break down voltage of a zener-diode is set by controlling the doping level. The
reverse break down of a PN junction may occur either due to avalanche (or)
zener effect. At reverse voltage less than 6 volts, zener effect predominates,
whereas above 6 volts avalanche effect is predominant.
Zener
break down occurs due to breaking of covalent bonds by the strong electric
field set up in the depletion region by the reverse voltage. It produces an
extremely large number of electrons and holes which constitute the reverse
saturation current. Whose value is limited only by the external resistance in
the circuit. Avalanche break-down occurs at higher reverse voltages when
thermally- generated electrons acquire sufficient energy to produce more
carriers by collision.
Zener
voltage:
Zener
diode are available having zener voltages of 2.4 volts to 200 volts.
Zener
Biasing:
For
proper working of a zener diode in any circuit, it essential that it must be
reverse biased and have voltage across it greater than Vz.
Application
of zener diode:
(i)
Voltage regulator
(ii)
Used as peak clippers
(iii)
For meter protection against damage from accidental application of excessive
voltage.
Basic Electrical and Electronics Engineering: Unit III: Analog Electronics : Tag: : Construction, Symbol, Circuit diagram, Biasing, Applications - Zener Diode
Basic Electrical and Electronics Engineering: Unit III: Analog Electronics
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