LM317 ADJUSTABLE VOLTAGE REGULATOR

Description

LM317 Voltage Regulator

It is a type of positive-linear-voltage regulators used for voltage regulation,  which is invented by Robert C. Dobkin and Robert J. Widlar while they worked at the National Semiconductor in 1970. It is a three-terminal-adjustable-voltage regulator and is easy to use because to set the output voltage it requires only two external resistors in the LM317 voltage regulator circuit. It is majorly used for local and on-card regulation. If we connect A FIXED RESISTOR  between the output and adjustment of the LM317 regulator, then the LM317 circuit can be used as a precision current regulator.

FEATURES

• It is capable of providing an excess current of 1.5A, hence it is conceptually considered as an operational amplifier with an output voltage ranging from 1.2V to 37V.
• The LM317 voltage regulator circuit internally consists of thermal overload protection and short circuit current limiting constant with temperature.
• It is available in two packages as 3-Lead Transistor Package and surface mount D2PAK-3.
• Stocking many fixed voltages can be eliminated.