Zener diodes are widely used as voltage references and as shunt regulators to regulate the voltage across small circuits. 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.
How does a shunt regulator work?
Answer: A shunt regulator detects output voltage variation via external resistors by using an error amplifier and controls a transistor connected in parallel to the load to keep the output voltage constant.
What is basic shunt regulator?
The shunt regulator or shunt voltage regulator is a form of voltage regulator where the regulating element shunts the current to ground. The shunt regulator operates by maintaining a constant voltage across its terminals and it takes up the surplus current to maintain the voltage across the load.
Why Zener diode is used in 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.
When to use a Zener diode shunt regulator?
For most small scale electronics, the power consumption is (is or at least could be with better design) very low. For those times when you don’t need a lot of power, just a precise voltage level, the simplest means of regulating the supply voltage is by using a Zener diode.
How does a shunt regulator maintain the current?
The shunt regulator or shunt voltage regulator is a form of regulator where the regulating element shunts the current to ground. By maintaining a constant voltage across its terminals it takes up the surplus current to maintain the voltage across the load.
Can a shunt be used in a high current situation?
Shunt voltage regulators are not particularly effective or efficient in high current situations,. The simple Zener diode voltage regulator, when used as a low current voltage reference is widely used, and its inefficiency can be tolerated in view of the low current.
What are the features of the LM431 shunt regulator?
1 Features 3 Description The LM431 is a 3-terminal adjustable shunt regulator 1• Average Temperature Coefficient 50 ppm/°C with ensured temperature stability over the entire • Temperature Compensated for Operation Over temperature range of operation. The output voltage