The LM317 is National Semiconductor's three-terminal adjustable positive regulator IC. The LM317 has an output voltage range of 1.2V to 37V and a maximum load current of 1.5A. It is very simple to use and requires only two external resistors to set the output voltage. In addition, its linear regulation and load regulation are better than standard fixed voltage regulators. The LM317 has built-in protection circuits such as overload protection and safety zone protection. Usually the LM317 does not require an external capacitor unless the input filter capacitor is more than 6 inches (approximately 15 cm) from the LM317 input. Using output capacitors can change the transient response. Using the filter capacitor on the regulation side results in a much higher ripple rejection ratio than the standard three-terminal regulator. The LM317 can have many special uses. For example, suspending the adjustment terminal to a higher voltage can be used to regulate voltages up to several hundred volts as long as the input and output voltage difference does not exceed the limit of the LM317. Of course, avoid shorting the output. It is also possible to connect the trim terminal to a programmable voltage for a programmable power supply output.
Feature introduction
The adjustable output voltage is as low as 1.2V. Guaranteed 1.5A output current. Typical linearity adjustment is 0.01%. Typical load regulation is 0.1%. 80dB ripple rejection ratio. Output short circuit protection. Overcurrent, overheat protection. Adjust the safe working area protection of the tube. Standard three-terminal transistor package.
voltage range
The LM317 is continuously adjustable from 1.25V to 37V.
LM317 working principle: input maximum voltage is more than 30 volts, output voltage 1.5----32V...current 1.5A... However, pay attention to power consumption when using it... pay attention to heat dissipation. The LM317 has three pins. One input, one output, and one voltage regulation. The input pin inputs positive voltage, the output pin is connected to the load, the voltage adjustment pin has one pin connected resistor (about 200) on the output pin, and the other is connected to the adjustable resistor (several K) to ground. Input and output pins Connect the filter capacitor to the ground.
LM317 internal schematic:
LM317 typical application circuit
Shielding Parts,Counterweight Material Lift,Elevator Counterweight Material,Trebuchet Counterweight Materials
Shaanxi Xinlong Metal Electro-mechanical Co., Ltd. , https://www.cnxlalloys.com