Main parameters and applications of voltage regulator diodes

Main parameters and applications of voltage regulator diodes

Zener diode, also known as Zener diode in English. A diode used to stabilize voltage by utilizing the phenomenon of PN junction reverse breakdown state, where the current can change over a large range while the voltage remains basically unchanged.

This diode is a semiconductor device that has a high resistance until the critical reverse breakdown voltage.

At this critical breakdown point, the reverse resistance decreases to a very small value, and in this low resistance region, the current increases while the voltage remains constant. The voltage regulator diode is classified based on the breakdown voltage, and due to this characteristic, the voltage regulator is mainly used as a voltage regulator or voltage reference element.

Zener diode can be connected in series for use at higher voltages, and higher stable voltages can be obtained by connecting them in series.

Principle: It operates in a reverse breakdown state of voltage. When the reverse voltage reaches and exceeds the stable voltage, the reverse current suddenly increases, and the voltage at both ends of the diode remains constant.

Classification:

From high to low voltage stabilization: Low voltage stabilization diode

High voltage regulator diode

From material classification: N-type; P-type

Main parameters:

① Stable voltage VZ: The corresponding reverse working voltage under the specified voltage regulator and reverse working current IZ.

② Stable current

③ Dynamic resistance rZ;

④ Maximum dissipated power

⑤ Maximum stable working current IZmax and minimum stable working current

⑥ The temperature coefficient at, the higher the temperature, the greater the voltage stabilization error

Purpose:

① Clamp protection for drain and source electrodes

Silicon voltage regulator diode voltage regulator circuit

It utilizes the reverse breakdown characteristic of the voltage regulator diode to stabilize the voltage. Due to the steep reverse characteristic, large current changes only cause small voltage changes.