# How do you use the LM317 formula?

## How do you use the LM317 formula?

Using the formula for the output voltage, VOUT= 1.25V (1 + R2/R1). Being that R1=240Ω, our equation is now 5V= 1.25V (1 + R2/240Ω), so R2=720Ω. So with R2 being a value of 720Ω, the LM317 will output 5V if fed an input voltage greater than 5 volts.

## How does LM317 voltage regulator work?

LM317 Working Principle It is a variable voltage regulator i.e. supports different output voltage levels for a constant applied input voltage supply. A variable resistor is connected at its Adjustment (Adj) terminal in order to control the level of the output voltage according to the requirements of the circuit.

How do you calculate the range of output voltage in LM317?

Let R1 = 240 Ω and R2 = 1200 Ω .

1. Enter the values of R1 = 240 Ω and R2 = 1200 Ω .
2. The LM317 output voltage calculator will display the output voltage V = 7.5 V .
3. You can also use this LM317 calculator to calculate the value of R1 (or R2 ) by supplying the values of V and R2 (or R1 ).

### What is the maximum limit of output current of the IC 317?

The LM317T is an adjustable 3-terminal positive voltage regulator capable of supplying different DC voltage outputs other than the fixed voltage power supply of +5 or +12 volts, or as a variable output voltage from a few volts up to some maximum value all with currents of about 1.5 amperes.

### What is then the LM317 IC is all about?

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 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage.

What is the hardware name of the IC 317?

The Fiery IC-317 features the new Fiery NX Pro hardware. The NX Pro includes Fiery QuickTouchTM software on the touchscreen display, which gives faster views of job status information and access to server management.

## How do you make a variable power supply circuit?

This transformer step downs the 220V supply to 24V which is then rectified through a bridge rectifier. The bridge rectifier gives a continuous pulsating DC signal. Then capacitors are used to filter the pulsating signal into a smooth non-pulsating DC. Finally, the voltage is regulated using a regulator IC.

## Does LM317 limit current?

For a constant current supply we just need to add in a series resistor to drop 1.25 V at the required current. The LM317 can handle currents up to 1.5 A but be careful to so some power dissipation calculations and heatsink adequately if the power goes over a watt or two. (See ‘Temperature rise’ below.)