Power Supply Lm317 Adjustable Voltage And Current Regulator Circuit

To be precise the upper lm317 forms the current regulator stage while the lower acts like a voltage controller stage.

Power supply lm317 adjustable voltage and current regulator circuit.

Lets make a high current power supply with lm317 voltage regulator which can supply upto 5 amp lm317 is one of the oldest most used and wonderful linear voltage regulators. This circuit looks like in my first variable dc power supply but this high current higher than 3 amp. Lm317 voltage regulator ic. 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. The input supply source is connected across the vin and ground of the upper current regulator circuit the output from this stage goes to the input of the lower lm317 variable voltage regulator stage. High power dc regulator 4 20 volts 20 amps by lm338. So have a few components.

This is the simple solution. In most of the applications due to irregular loads the output voltage produced has fluctuations in it which can lead to damaging loads. I personally love this ic yes it s not a transistor a lot not because it server it purpose well but because it s cheap easy and never disappoints you while making a regulated dc power supply. The rectified voltage at capacitor c1 is around 42 30v 30 volt sqr2 30v 1 41 42 30.

I have several surplus laptop power supplies often rated at 19v at several amps. Youtube video current boost lm317 adj. The lm317 is an adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1 5 a over an output voltage range of 1 2 v to 37 volts. If you add two diode series with the output to reduce voltage start with 0 volts.

The lm317 is an inexpensive solution to simple variable power supplies. It can supply greater than 1 5 a at the output. The lm317 ic helps in current limiting thermal overload protection and safe operating area. So we need to use all the capacitors which are rated at 50v in the circuit.

It can apply voltage output 1 25v to 35v. The lm317 has a low current rating that limits its use. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Although the voltage regulator lm317 protects the circuit from overheating and overload the fuses f1 and f2 are used to protect the power supply circuit.

From all principles above we have circuits applications as shown in figure 4 if you want to add the ic lm338 enabling them to be higher current.