Lm317 Adjustable Voltage And Current Regulator Circuit

Resistor 240ohm capacitor 1uf and 0 1uf potentiometer 10k battery 9v circuit diagram lm317 voltage regulator ic.

Lm317 adjustable voltage and current regulator circuit.

It can supply greater than 1 5 a at the output. The circuit shown above is of a 5a constant current constant voltage regulator using lm317. The control of the output voltage remained the same. The voltage control properties of the lm317 was normal.

The above test circuit supplied 1 amp while 95 of current passed through q1. 10 1 25x 1 r2 240 r2 1680ω. It can give the output current 20a or 400watts and can adjust the voltage of 4 to 20v or apply to 0 to 30v easily. We know lm317 is a popular adjustable positive voltage regulator with capability of delivering 1 5a output current to the load over an output voltage range of 1 25 v to 37 v.

In most of the applications due to irregular loads the output voltage produced has fluctuations in it which can lead to damaging loads. This may be a better choice for you. 1 i have a lm317 combined with a mj2955 pnp pass transistor. The only issue is i used a 18 0 18 transformer 500ma rated i intentionally used less current one r3 changed to 2 ohm and r1 to 220 ohm and managed to get only 0 100 ma of current regulation.

Such a circuit is a very inevitable gadget on the work bench of an electronic enthusiast. It s an adjustable three terminal voltage regulator ic with a high output current value of 1 5a. Lm317 is a positive voltage regulator with an adjustable voltage range from 1 25 v to 37 v. This current regulator calculator will work for all adjustable integrated circuit regulators with a reference voltage v ref of 1 25.

In addition to lm317 lm310 a single operational amplifier is also used in the circuit. It is good quality excellent performance and durable with pcb. Simple variable lm317 voltage regulator circuit using few easily available components has been designed and tested in this article as follows. Lm317 voltage regulator ic.

The lm317 ic helps in current limiting thermal overload protection and safe operating area. It has an adjustable 3 terminal positive voltage regulator designed to supply more than 1 5 a of load current with an output voltage adjustable over a 1 2v to 37v range. Lm317 has only three terminals and gives variable regulated output. This lm317 calculator can be also be used for some other ics like lm338 or lm350.

So this is how we calculate the r2 and output voltage for lm317 voltage regulator circuit. I just placed the voltage regulator before the current regulator circuit. By 0 5 amps the device is getting hot. For example if the target output voltage is 10v then the r2 value is calculated as following.

For more information about these voltage regulators see the lm317 lm338 lm350 voltage regulator calculator information and circuits page. As rated at an excess of 1 5 amps.