Quick Answer: What Is The Cause Of Reverse Breakdown Voltage?

What is reverse break down voltage?

Glossary Term: Reverse-Breakdown-Voltage Definition.

Peak Inverse Voltage (PIV) or Peak Reverse Voltage (PRV) refer to the maximum voltage a diode or other device can withstand in the reverse-biased direction before breakdown.

Also may be called Reverse Breakdown Voltage..

How do you calculate reverse bias voltage?

Reverse bias. Under reverse bias, the n side is held at a higher voltage than the p side. If the applied voltage is V, then the total potential difference across the diode becomes Vreverse bias = v0 + V (where v0 is the barrier potential).

Why do we use zener diode?

Zener diodes are used for voltage regulation, as reference elements, surge suppressors, and in switching applications and clipper circuits. The load voltage equals breakdown voltage VZ of the diode. The series resistor limits the current through the diode and drops the excess voltage when the diode is conducting.

What is Zener effect and Avalanche effect?

The Zener effect is distinct from avalanche breakdown. … The avalanche breakdown occurs in lightly doped junctions, which produce a wider depletion region. Temperature increase in the junction increases the contribution of the Zener effect to breakdown, and decreases the contribution of the avalanche effect.

When a high reverse voltage is applied to a PN junction?

If the maximum reverse voltage () is applied to an ordinary PN junction diode, it gets damaged due to the flow of large reverse current (). Such high current causes excessive power dissipation () in a diode and subsequent rise in diode junction temperature to kill it.

What is reverse breakdown region?

breakdown region, (reverse) The portion of the voltage-current characteristic beyond the initiation of breakdown for an increasing magnitude of reverse current.

What happens if the reverse bias is made very high?

What happens if the reverse bias is made very high? … If reverse bias voltage exceeds the permissible limit, reverse leakage current of the device will go dangerously high and may result in irreversible damage of the component. If the device simply opens, the damage may be limited only to the said device.

What is avalanche breakdown and Zener breakdown?

The avalanche breakdown is an occurrence of raising the flow of electric current or electrons in insulating material or semiconductor by giving the high voltage. The depletion region of the Zener is thin whereas the avalanche is thick. The connection of the Zener is not-destroy whereas the avalanche is destroyed.

What is Zener breakdown voltage?

Answered August 20, 2016. The Zener Breakdown is observed in the Zener diodes having Vz less than 5V or between 5 to 8 volts. When a reverse voltage is applied to a Zener diode, it causes a very intense electric field to appear across a narrow depletion region.

What is the breakdown voltage of silicon?

Silicon diodes have a forward voltage of approximately 0.7 volts. Germanium diodes have a forward voltage of approximately 0.3 volts. The maximum reverse-bias voltage that a diode can withstand without “breaking down” is called the Peak Inverse Voltage, or PIV rating.

What is the value of Zener voltage?

Breakdown voltage for commonly available Zener diodes can vary widely from 1.2 V to 200 V. For diodes that are lightly doped the breakdown is dominated by the avalanche effect rather than the Zener effect. Consequently, the breakdown voltage is higher (over 5.6 V) for these devices.

What is the main cause of Zener breakdown?

What is the main cause of Zener breakdown? Zener diode is fabricated by heavily doping p-side and n-side. So, even for a small reverse bias voltage, the electric field of the junction is extremely high. … The electrons emitted account for high current flow, causing a breakdown called zener breakdown.

What happens in reverse bias?

By applying a negative voltage (reverse bias) results in the free charges being pulled away from the junction resulting in the depletion layer width being increased. This has the effect of increasing or decreasing the effective resistance of the junction itself allowing or blocking current flow through the diode.

What happens when PN junction is reverse biased?

If the reverse biased voltage applied on the p-n junction diode is further increased, then even more number of free electrons and holes are pulled away from the p-n junction. This increases the width of depletion region. … Thus, the minority charge carriers carry the electric current in reverse biased p-n junction diode.

Why there is no current in reverse bias condition?

This is because in case of reverse bias, p side has lots of -ve ions & n side has +ve ions vice verss. This increase in the number of ions prevents current flow across the junction by majority carriers. eg. electrons can’t complete the loop as they experience resistance of -ve ions on the p side.

What is the difference between avalanche breakdown and Zener breakdown?

The main difference between Zener breakdown and avalanche breakdown is their mechanism of occurrence. Zener breakdown occurs because of the high electric field whereas, the avalanche breakdown occurs because of the collision of free electrons with atoms. Both these breakdowns can occur simultaneously.

Is avalanche breakdown reversible?

And this phenomenon is called a breakdown, and it is important to know that this is not a destructive process. It is a non-destructive and reversible process, that is, if you ramp the voltage down then the current will decrease and if you increase or reverse bias again and then current will increase again.