Lm317 Voltage Regulator Circuit 5v

It was designed by bob pease who also worked for national semiconductor.

Lm317 voltage regulator circuit 5v. When we use a cheap mp3 player which uses only one 1 5v aa battery as its power supply. Lm317 lm338 lm350 voltage regulator circuits the following schematics show typical circuit applications for the lm317 lm338 lm350 voltage regulators. The dropout voltage of the ic regulator is about 1 5 to 2 5 volts dependent on the output current i out. In most of the applications due to irregular loads the output voltage produced has fluctuations in it which can lead to damaging loads.

Resistor network comprising of r1 and r2 connected in association to the pin1 adj is used to set the output voltage. Dual power supply circuit can select voltage levels 3v 5v 6v 9v 12 15v at 1a and 3v 5v 6v 9v 12v 15v at 1a use lm317 positive lm337 negative usb battery replacement this is a usb 5v to 1 5v step down converter circuit. It can supply greater than 1 5 a at the output. The device features a typical line regulation of 0 01 and typical load regulation of 0 1.

Working of lm317 voltage regulator circuit. Input voltage is fed to the pin3 v in of the ic and regulated output voltage is available from pin 2 v out of the ic. This lm317 calculator can be also be used for some other ics like lm338 or lm350. For example if the target output voltage is 10v then the r2 value is calculated as following.

10 1 25x 1 r2 240 r2 1680ω. Lm317 is a positive voltage regulator with an adjustable voltage range from 1 25 v to 37 v. Based on the formula above in order for the lm317 to output 5 volts the value of r2 must be 720ω. This voltage regulator circuit is very simple.

It requires only two external resistors to set the output voltage. Low dropout 5v regulator. The lm337 is the negative complement to the lm317 which regulates voltages below a reference. A classic voltage regulator circuit using lm317 is shown above.

The lm317 is a popular adjustable positive linear voltage regulator it was designed by bob dobkin in 1976 while he worked at national semiconductor. Set this above circuit up and then use a multimeter to check the output voltage by placing it across the 1µf capacitor or across the the resistors. So this is how we calculate the r2 and output voltage for lm317 voltage regulator circuit. The adjustable pin is connected with the two external resistor and connected with the vout pin of the ic.

The capacitor c1 used for the filtering of dc input voltage and further fed to the vin pin of the lm317 voltage regulator ic. We re going to put 12 volts into the voltage regulator and regulate it down to 5v.