How do I change the output voltage on a LM317?

How do I change the output voltage on a LM317?

To adjust output, we swap out resistor R2 value for a different resistance. This creates adjustable voltages. VOUT- VOUT is the pin which outputs the regulated voltage. For example, the LM317 may receive 12V as the input and output a constant 10V as output.

What are the terminals of IC LM317?

The three terminals are input pin, output pin, and adjustment pin. The LM317 circuit is shown in the below figure is a typical configuration of the LM317 voltage regulator circuit diagram including the decoupling capacitors.

What is the maximum input voltage for a LM317?

Texas Instruments’ LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output-voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%.

How to test a LM317?

The best and most effective testing technique to test this IC is out of the PCB. For the pin out of this IC please refer to the exactly IC datasheet what you have to test. In this document, I will use the LM317T regulator and the pin out is usually the same with other LM317 family.

How to make 3V DC regulator using LM317?

The output voltage is determined by rotating a selector switch S2 a level voltage 1.5,3,4.5,5,6,9 volts respectively.

  • C5 (10uF) control impedance and reduce a transient at the output of IC1
  • C3 (10uF)- help to reduce the ripple before it is amplified when the output voltage rises up.
  • C4 (0.1uF) reduces the ripple at the output.
  • What is voltage regulator and how does it work?

    Linear Voltage and Switching Regulator Explained. A linear regulator uses an active pass device called bipolar junction transistor (BJT) or MOSFET) run by a high-gain differential amplifier.

  • Switching Regulator Topologies.
  • Linear Regulators vs.
  • Switching Regulator Output Method Explained.
  • Additional Features for Voltage Regulator IC.