Power Supply Lm317 Adjustable Voltage And Current 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.

Power supply lm317 adjustable voltage and current regulator circuit.

It s an adjustable three terminal voltage regulator ic with a high output current value of 1 5a. 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. This circuit looks like in my first variable dc power supply but this high current higher than 3 amp. 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.

It can apply voltage output 1 25v to 35v. If you add two diode series with the output to reduce voltage start with 0 volts. It can supply greater than 1 5 a at the output. Lm317 voltage regulator ic.

For a transformer that can supply at least 30 amperes and voltage secondary coil should not be less than 18 volts. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. To be precise the upper lm317 forms the current regulator stage while the lower acts like a voltage controller stage. 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.

Youtube video current boost lm317 adj. The rectified voltage at capacitor c1 is around 42 30v 30 volt sqr2 30v 1 41 42 30. This is the simple solution. 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.

I have several surplus laptop power supplies often rated at 19v at several amps. So have a few components. The lm350 voltage regulator is 3a dc adjustable power supply high performance. So we need to use all the capacitors which are rated at 50v in the circuit.

Lm317 is a positive voltage regulator with an adjustable voltage range from 1 25 v to 37 v. The lm317 ic helps in current limiting thermal overload protection and safe operating area. 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. 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.

The lm317 is an inexpensive solution to simple variable power supplies.