What is LM317 module?
What is LM317 module?
The LM317 DC-DC Adjustable Voltage Regulator Power Supply Module is an adjustable 3-terminal positive voltage regulator. It is capable of delivering more than 1.5 Amp current over an output voltage range of 1.25 to 37 Volts. The LM317 requires only 2 resistors to set the output voltage.
What is inside LM317?
The LM317 voltage regulator circuit internally consists of thermal overload protection and short circuit current limiting constant with temperature. It is available in two packages as 3-Lead Transistor Package and surface mount D2PAK-3. Stocking many fixed voltages can be eliminated.
How does an adjustable voltage regulator work?
An adjustable voltage regulator is a regulator that can be adjusted to output any voltage from the range that the voltage regulator is designed to output. Here you see we connect two resistors to the voltage regulator. These resistors determine the voltage that the voltage regulator adjusts to and outputs.
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%.
How do you calculate the output voltage of LM317?
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.
What is the drop out voltage of a LM317?
When used as a voltage regulator, the LM317 will drop a minimum of 1.7v across itself (Vin-Vout >=1.7v); this is known as the “dropout voltage”.
What is the dropout voltage of LM317?
How does a LM317 circuit work?
LM317 Circuit. This is how a LM317 regulator would look when connected to a circuit so that it supplies a constant DC voltage output. In this circuit, we add a DC voltage supply to the V IN pin of the regulator. This is the pin which, again, receives incoming voltage which the chip will then regulate down.
What is LM317 3-terminal adjustable voltage regulator?
In Depth Guide: LM317 3-Terminal Adjustable voltage Regulator LM317 is a positive-voltage regulator with an adjustable voltage range from 1.25 V to 37 V. It can supply greater than 1.5 A at the output. In most of the applications, due to irregular loads, the output voltage produced has fluctuations in it which can lead to damaging loads.
What is the working of LM 317?
LM 317 works on a very simple 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.
What are the applications of LM317 ICS?
Battery charger circuits, reverse polarity circuits, variable power supply, motor control circuits are designed using LM317 IC. By using two LM317 IC’s, you can regulate both the positive and negative swings of a sinusoidal AC input.
