Zener Diode And TVS Diodes

Zener diode and TVS diodes

Zener Diod

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

Category B

From high voltage to low voltage: low voltage regulator diode (<40V);

High voltage regulator diode (>200V)

From material classification: N-type; P-type

C. Main parameters

① Stable voltage VZ: The corresponding reverse operating voltage at the specified voltage regulator and reverse operating current IZ.

② Stable current IE

③ Dynamic resistance rZ;

④ Maximum dissipation power PZM

⑤ Maximum stable working current IZmax and minimum stable working current IZmin

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

D. Purpose

① Clamp protection for drain and source electrodes

Silicon zener diode zener circuit

It uses 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.