Lm317 Adjustable Voltage Regulator Schematic

This lm317 calculator can be also be used for some other ics like lm338 or lm350.

Lm317 adjustable voltage regulator schematic.

Adjust voltage in steps 3v 6v 9v 12v. For example if the target output voltage is 10v then the r2 value is calculated as following. And in fine 1 25v to 20v. 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.

By 0 5 amps the device is getting hot. It requires only two external resistors to set the output voltage. 10 1 25x 1 r2 240 r2 1680ω. This lm317 circuit is capable to provide variable dc power supply with an output of 1a and can be adjusted up to 30v.

It can supply greater than 1 5 a at the output. High quality 3a adjustable voltage regulator. The lm317 circuit is shown in the below figure is a t y pical configuration of the lm317 voltage regulator circuit diagram including the decoupling capacitors. With automatic charging and full charged indicator using tl431.

The lm337 is the negative complement to the lm317 which regulates voltages below a reference. The control of the output voltage remained the same. Working of lm317 voltage regulator circuit. In most of the applications due to irregular loads the output voltage produced has fluctuations in it which can lead to damaging loads.

The device features a typical line regulation of 0 01 and typical load regulation of 0 1. The capacitor c1 used for the filtering of dc input voltage and further fed to the vin pin of the lm317 voltage regulator ic. The above test circuit supplied 1 amp while 95 of current passed through q1. Typical positive voltage regulator circuit using lm317.

4 lead acid battery charger circuits see 4 lm317 lead acid battery charger circuits for 6v 12v and 24v battery. It was designed by bob pease who also worked for national semiconductor. The voltage control properties of the lm317 was normal. Lm317 is a positive voltage regulator with an adjustable voltage range from 1 25 v to 37 v.

A classic voltage regulator circuit using lm317 is shown above. As rated at an excess of 1 5 amps. Resistor network comprising of r1 and r2 connected in association to the. The lm317 is a popular adjustable positive linear voltage regulator it was designed by bob dobkin in 1976 while he worked at national semiconductor.

1 i have a lm317 combined with a mj2955 pnp pass transistor. This voltage regulator circuit is very simple. So this is how we calculate the r2 and output voltage for lm317 voltage regulator circuit. The device features a typical line regulation of 0 01 and typical load regulation of 0 1.

It requires only two external resistors to set the output voltage. The lm317 device is an adjustable three terminal positive voltage regulator capable of supplying more than 1 5 a over an output voltage range of 1 25 v to 37 v.