Lm317t Variable Voltage Regulator

The output voltage of the lm317t variable adjustable voltage regulator is determined by the ratio of two resistors r1 and r2 which basically forms a voltage divider circuit across the output terminal of the lm317t voltage regulator.

Lm317t variable voltage regulator.

For example the input voltage pin can be fed 12v. We have 78xx 7805 7806 7812 etc series voltage regulators for positive power supply and 79xx for negative power supply. Vin vin is the pin which receives the incoming voltage which is to be regulated down to a specified voltage. It was designed by bob pease who also worked for national semiconductor.

Absolute maximum ratings are those values. The lm317 is a 3 terminal positive voltage regulator with a 1 25 to 37 volts output voltage range. But what if need to vary the power supply voltage so here we have variable voltage regulator ic lm317. The output voltage v out is dependent on external resistor values r 1 and r 2 according to the following equation.

It requires two external resistors to adjust the output voltage. The lm317 voltage regulator has 3 pins. By using the ratio of two resistances one of a fixed value and the other variable or both fixed we can set the output voltage to the. Internally limited a lm217 25 to 150 c lm317 0 to 125 lm317b 40 to 125 pd power dissipation internally limited tstg storage temperature 65 to 150 c note.

Lm317 is an adjustable voltage regulator which takes an input voltage of 3 40v dc and provides a fixed output voltage of 1 25v to 37v dc. Absolute maximum ratings symbol parameter value unit vi vo input reference differential voltage 40 v tiopo output currentoperating junction temperature for. Below is the pinout. 1 2v to 37v voltage regulator lm317t datasheet lm317t circuit lm317t data sheet.

In this tutorial we will show you how to get the variable regulated voltage from the lm317 ic. Pricing and availability on millions of electronic components from digi key electronics. Looking from the front of the voltage regulator the first pin on the left is the adjustable pin the middle is vout and the last pin on the right is vin. The lm317 regulator terminals are.

Variable voltage power supply. 2 maximum ratings table 1. In input out output adj adjust. Stmicroelectronics alldatasheet datasheet datasheet search site for electronic.

The lm317 is a popular adjustable positive linear voltage regulator it was designed by bob dobkin in 1976 while he worked at national semiconductor. Lm317t linear voltage regulator ic 1 output 1 5a to 220ab from stmicroelectronics. Lm317 variable voltage regulator circuit lm117 lm217 lm317 variable voltage regulator characteristics.