Zener diode as voltage regulator: What conditions are required and why?

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Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. When connected in parallel mcdvoice with a variable voltage source so that it is reverse biased, aZener diode conducts when the voltage reaches thediode's reverse breakdown voltage.

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When connected in parallel with a variable voltage source so that it is reverse biased, a zener diode conducts when the voltage reaches the diode's reverse breakdown voltage. mcdvoice

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well said, The Zener diode specially made to have a reverse voltage breakdown at a specific voltage. Its characteristics are otherwise very similar to common diodes. In breakdown, the voltage across the Zener diode is close to constant over a wide range of currents thus making it useful as a shunt voltage regulator

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A Zener diode working in the breakdown region can serve as a voltage regulator. It maintains a constant output voltage even when input voltage Vi or load current IL varies. ... It conducts and draws relatively large current through the series resistance Ri

A Zener diode can act as a voltage regulator when it is operated in its reverse breakdown mode. When a Zener diode is reverse biased, it experiences a phenomenon called the Zener breakdown, which allows it to maintain a constant voltage across its terminals even when the input voltage varies. This makes the Zener diode useful as a voltage regulator.

To act as a voltage regulator, a Zener diode is connected in parallel with the load that needs to be regulated, and the diode is biased in reverse using a resistor. The Zener diode maintains a constant voltage across its terminals, which is then applied to the load. As the input voltage increases, the excess voltage is dropped across the resistor, and the voltage across the load remains constant.

The Zener diode can act as a regulator as long as the current through the diode and the load does not exceed the maximum current rating of the diode. Also, the Zener voltage of the diode should be chosen appropriately to match the voltage requirement of the load.

In summary, a Zener diode acts as a regulator when it is operated in its reverse breakdown mode, and it is used to maintain a constant voltage across a load by dropping any excess voltage across a resistor.