Gambar dan simbol dioda zener
The principle of zener diode is the zener breakdown. When a diode is heavily doped, it’s depletion region will be narrow. When a high reverse voltage is applied across the junction, there will be very strong electric field at the junction. And the electron hole pair generation takes place. Thus heavy current flows. This is known as Zener break down.
So a zener diode, in a forward biased condition acts as a normal diode. In reverse biased mode, after the break down of junction current through diode increases sharply. But the voltage across it remains constant
Funsi dioda Zener
Zener function is to stabilize the voltage. At the time connected in parallel with a source voltage swings are installed so that the ration-back, a zener diode will act like a short circuit (short-circuit) voltage when the voltage reaches the diode damage. The result, the voltage will be limited to a number that has been known previously.