Lm317t Variable Voltage Regulator

For example the input voltage pin can be fed 12v.

Lm317t variable voltage regulator.

1 2v to 37v voltage regulator lm317t datasheet lm317t circuit lm317t data sheet. 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. 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. Pricing and availability on millions of electronic components from digi key electronics.

The lm317 is a popular adjustable positive linear voltage regulator it was designed by bob dobkin in 1976 while he worked at national semiconductor. Stmicroelectronics alldatasheet datasheet datasheet search site for electronic. 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. Lm317t linear voltage regulator ic 1 output 1 5a to 220ab from stmicroelectronics.

The lm317 regulator terminals are. Variable voltage power supply. In input out output adj adjust. 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.

The output voltage v out is dependent on external resistor values r 1 and r 2 according to the following equation. 2 maximum ratings table 1. It requires two external resistors to adjust the output voltage. But what if need to vary the power supply voltage so here we have variable voltage regulator ic lm317.

Below is the pinout. Vin vin is the pin which receives the incoming voltage which is to be regulated down to a specified voltage. We have 78xx 7805 7806 7812 etc series voltage regulators for positive power supply and 79xx for negative power supply. Order today ships today.

In this tutorial we will show you how to get the variable regulated voltage from the lm317 ic. 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. Absolute maximum ratings symbol parameter value unit vi vo input reference differential voltage 40 v tiopo output currentoperating junction temperature for. The lm317t is a fully adjustable 3 terminal positive voltage regulator capable of supplying 1 5 amps with an output voltage ranging from around 1 25 volts to just over 30 volts.

Absolute maximum ratings are those values. The lm337 is the negative complement to the lm317 which regulates voltages below a reference. The lm317 voltage regulator has 3 pins.