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diodesDescription complète
Details on Diode circuits
refertar diode
Descripción completa
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Full description
Full description
Zener Zener Diod Diode e & its its Appl Applic icati ations ons
Zener Diode This is a diode designed with adequate power dissipation capabilities to operate in the breakdown region. When both sides are heavily doped, the depletion layer is very thin (100 ). Even 4 V may give a field of 107 V/m, causing breakdown. Whatever may be the breakdown phenomenon, it is called zener diode .
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Equivalent Circuits
R z
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v
By controlling the thickness of the depletion layer, Zener Diode can be made to have breakdown at a specified Zener Voltage.
v
Generally Zener Voltage ranges from 0 volts to 200 volts. As long as the current through the diode is limited by the external resistance in the circuit within permissible values, it does not burn out.
v
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Zener Diode Applications 1. Voltage Stabilizer or Regulator. 2. Peak Clipper. 3. Switching Operation. 4. Reference Element. 5. Meter Protection.
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Voltage Regulator
It has the ability to maintain a constant output even when either the input voltage or load varies. //
A voltage regulator provides a constant voltage from a source whose voltage may vary appreciably.
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Example
Zener Diode
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Zener Diode
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This voltage (82.5 V) is more than V Z (= 60 V). Hence, diode is ON . Replace the diode by its equivalent.
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Zener Diode
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Zener Diode
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Zener Diode
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Zener Diode
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This is more than V Z . Hence diode is ON . We now calculate the minimum value of zener current.
