The lm317 calculator is a helpful online tool that can simplify the voltage regulator design process. It is a one of the most widely used voltage regulator that has been used in many different electronic circuits for a long time. It is an adjustable three terminal positive voltage regulator. This online tool can quickly and accurately calculate the values for the two external resistors required to set the fixed output voltage of the lm317 IC.
Most popular LM317 is a 3-terminal adjustable voltage regulator IC which is having multiple variants like LM317T LM317-N LM317A LM317HV with same basic functionality with hardly any difference limited to operating temperate and maximum input voltage.
LM317 CALCULATOR TOOL
To use the above lm317 resistor calculator online tool, simply input the desired output voltage to be regulated, and the value of resistor R1. The calculator tool will then display the required values of the R2 external resistor.
^Input values for Vo must range from 1.2 to 37V. Always check for Standard available value of resistor, or you can use customized resistor. Default value of resistor R1 here is 1KΩ. Choose the resistors with tolerance of 0.5%, 1% or 2%
The lm317 calculator tool is an online tool that facilitate users to input the output voltage to be regulated with the help of lm317 and provides the suitable external resistor values according to the formula mentioned in the datasheet. The internal reference voltage of the lm317 is designed at 1.25 volts, with the current supplying capability of 1.5 Amp or more. Vi must range between 4.25 and 40 Volts for smooth operation.
A designer or engineer can calculate resistor values with this tool quickly at ease, without the need to calculate complex formulae or manual calculations.
The formula for regulated output voltage is:
Vo = 1.25 x (1 + R2/R1)
R2 and R1 are feedback resistor or shunt resistors. The feedback resistor or shunt resistor are there to provide reference voltage (Vref) to the regulator at which the output voltage is to regulate.
Also visit TL431 Calculator tool here
Using the lm317 Resistor Calculator Online Tool
For example, suppose you want to use a lm317 to regulate the output voltage of a power supply to 9V. The internal reference voltage of the lm317 is 1.25V. Using the lm317 calculator tool, you would input 9V to regulated voltage. Choose R1 value say (1kohm). The voltage regulator calculator tool would then display the required values of the R2 resistors (say 6.2 kilo-ohm).
One of the main advantages of using a lm317 is that it is having current limiting, thermal overload protection, and save operating area protection features.
Additionally, the tool can help prevent errors in calculations that can lead to circuit malfunctions or damage to components. By inputting the desired output voltage and the internal reference voltage of the lm317, the tool can ensure that the resistor values are calculated correctly. A voltage regulator calculator can be a valuable tool in your design journey as LM317 has a lot of applications not limiting to power supply solutions, Battery charger, Power-bank solutions, Motor-controls, signal generators.