Contents
How is a Zener diode input protection circuit?
Let’s see how the above circuit acts as a Zener Diode Input Protection circuit and protects the output from voltage more than 6.8V. The above circuit is simulated using cadence pspice. During the 6V input voltage across the V1, the output remains constant at 5.999V (Which is 6.0V). In the above simulation, the input voltage is 6.8V.
Where is the MOSFET located in a Zener circuit?
It’s intentionally installed “backward” (with the not-shown body diode cathode toward the right side of the circuit). When voltage of the correct polarity is applied, the mosfet is on and M1 is more or less invisible to the circuit.
What is the maximum current of a Zener resistor?
Resistor selection. It’s knee current, breakdown current, or minimum current is 0.25 mA. The maximum current is calculated by dividing the power rating by the Zener voltage: I=P/V = 3W/12V = 0.25A. In this case, the datasheet specifies 250 mA as the maximum current, so the calculation wasn’t necessary.
Can a series regulator circuit be identical to a Zener circuit?
The regulation of this series regulator circuit will never be identical to the regulation of the zener circuit, because the emitter follower simply cannot possess zero output impedance. And the voltage drop through the stage has to rise marginally in response to increasing output current.
What should the Zener voltage be for PSpice?
For the above example in Pspice, the Zener voltage is 6.8V. There will be some situations where the targeted Zener diode voltage is not available. In such cases, a close value of the Zener diode can be chosen. For example, for overvoltage protection up to 7V, a 6.8V Zener diode is a close value.
Which is the best diode for over voltage protection?
A very common and cost-effective solution is to use a Zener Diode Over Voltage Protection Circuit. Zener Diodes – Basics Zener diodes are mostly the first choice to protect the circuit from an overvoltage condition. A Zener diode follows the same principle of the diode, which is blocking the flow of current in the reverse direction.
Which is the best resistor for OVP protection?
Standard value 100R resistor can be chosen. OVP protection using Zener diodes is the easiest and simple process to protect devices from overvoltage. In this technique, the voltage remains regulated and the cost of this circuit is very less when compared with other methods.