# Why a Zener diode is used as a voltage regulator?

## Why a Zener diode is used as a voltage regulator?

Ans. When the Zener diode is given reverse bias feedback, there is a small leakage current until it attains the breakdown voltage or a constant voltage. At this point, the current begins flowing seamlessly without any change in voltage. Therefore, the constant voltage helps Zener Diode as Voltage Regulator.

What is voltage regulator in op amp?

The op amp is used as a voltage comparator: On the non-inverting input is the reference voltage VREF (so called because it remains steady when the input voltage changes), while on the inverting input is the voltage that will be generated at the output. Figure 1: Linear voltage regulator with op amp.

### What is the function of Zener diode in op amp?

When correctly reserve biased, the Zener diode keeps the voltage across its leads close to the Zener breakdown voltage. The op-amp is used as a linear voltage amplifier.

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What is the circuit diagram of a Zener diode voltage regulator?

The circuit diagram of a voltage regulator using a Zener diode is shown: The value of the series resistor is written as RS = (VL − VZ)IL. Current through the diode increases when the voltage across the diode tends to increase which results in the voltage drop across the resistor.

## How does a Zener diode work in reverse bias?

How does a Zener Diode work in reverse bias? A Zener diode operates just like a normal diode when it is forward-biased. However, when connected in reverse biased mode, a small leakage current flows through the diode. As the reverse voltage increases to the predetermined breakdown voltage (Vz), current starts flowing through the diode.

What happens when a Zener diode exceeds knee voltage?

Zener diode is connected parallel to the load to make it reverse bias and once the Zener diode exceeds knee voltage, the voltage across the load will become constant. When the input voltage is higher than the Zener breakage voltage, the voltage across the resistor drops resulting in a short circuit.