Lm7805 431 regulator lm7805 to92 package application notes on lm7805 431 marking lm7805 05 1r1 marking vs 431 datasheet lm7805 text. This post includes explanation of operation of zener diode and vi characteristics of zener diode. For example, diodes are used to regulate voltage zener diodes, to protect circuits. A diode is a twoterminal electronic component that conducts current primarily in one direction. Zener diode working with circuit diagram and applications. Basic electronics notes on vi characteristics of zener. For zener diodes, silicon is preferred to ge because of its high temperature and current capability. This video lecture explains the vi characteristics of the zener diode. Observation of characteristics of a zener diode debangshu mukherjee bs. Electrical characteristics tamb 25 c, unless otherwise specified part number zener voltage range 1 test current reverse leakage dynamic resistance f 1 khz surge current 3 regulator 2. A graph of current through vs the voltage across the device is called the characteristic of zener diode. A semiconductor diodes currentvoltage characteristic can be tailored by selecting.
Basics currentvoltage characteristic of a zener diode with a breakdown voltage of 17 volt. The circuit symbol of zener diode is as shown in the figure. The symbol of zener diode is similar to the normal pn junction diode, but with bend edges on the vertical bar. But due to higher doping concentration, higher current flows through the zener diode. Here you will learn, how the zener diode is used in reverse. Stmicroelectronics nv and its subsidiaries st reserve the. Currentvoltage characteristic of a zener diode with a breakdown voltage of 3. Vi characteristics of zener diode vi characteristics of. In reverse bias, a negligible constant current flow through the zener diode but the current becomes abruptly large at certain voltage.
The active portion of a zener diode is a semiconductor pn junction. When a forward voltage is applied, current flows through it. Zener diode definition a zener diode is a type of diode that permits current to flow in the forward direction like a normal diode, but also in the reverse direction if the voltage is larger than the breakdown voltage known as zener knee voltage or zener voltage. Electronics world 1968 08 fingerprint microphone scribd. The vi characteristic of zener diode indicates that characteristic of zener diode in forward bias is same as pn junction diode.
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