What is the output of LM317 regulator?
The 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%.
What can I use in place of LM317?
The Lm317 needs a minimum of 10mA load, i would use a 100ohm 10W load resistor, and use the MJE3055 transistor.
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.
Does LM317 need heatsink?
Linear regulators inherently waste power; the power dissipated is the current passed multiplied by the voltage difference between input and output. A LM317 commonly requires a heat sink to prevent the operating temperature from rising too high.
What does LM mean in electronics?
The LM series originated with integrated circuits made by National Semiconductor. The prefix LM stands for linear monolithic, referring to the analog components integrated onto a single piece of silicon.
Is LM317 a transistor?
The LM317 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 32 V. By using a heat-sinked pass transistor such as a 2N3055 (Q1) we can produce several amps of current far above the 1.5 amps of the LM317.
How do I know if my LM317 is working?
in order to test it without removing it you can measure the voltage between the output and the adjust pins. If it is less than 1.2V or more than 1.3V then it is not functioning properly. Be carefull because it can shut down if it has overheated or if the output current exceeds its max of 1.5A.
What is the voltage output of the LM317 power supply?
For example LM317 circuit Variable DC Power Supply 1.2V to 30V 1AFirst projects Linear power supply Regulator selector 1.5V,3V,4.5V,5V,6V,9V at 1.5A It’s easy to selects voltage output. 0-60 volt 30V Dual DC variable power supply using LM317 LM337 It’s high volt and start voltage at zero! good job.
Why should I use LM317?
Most people will use LM317 because of high-efficiency, easy to apply and cheaper. Description. It has an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5 A of load current with an output voltage adjustable over a 1.2V to 37V range.
How to control R7 voltage at the ADJ pin of LM317?
With the help of voltage divider created by the resistor R5 and series resistors R4, R7 voltage at the Adj pin of LM317 is controlled. This helps LM317 regulate the output voltage and keep it constant at the desired level.
What is the use of R4 transistor in LM317?
This helps LM317 regulate the output voltage and keep it constant at the desired level. R4 is a potentiometer (preset if on board) which helps you to adjust the output voltage. The 2N3055 transistor (Q1) along with TIP2955 (Q2) in the schematic allow higher currents to flow at the output which is beyond the capability of LM317 (1.5 Amps).