LM317LCD

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

PMIC - Voltage Regulators - Linear: the LM317LCD Application Field and Working Principle

A LM317LCD integrated circuit (IC) is one of the most important and versatile monolithic integrated circuits used in regulating the output voltage over a wide range of current levels. Primarily used in situations in which variable output voltage is needed, the LM317LCD is popularly utilized in switching power converters, light emitting diodes (LEDs), and small audio systems. Its ability to operate in both fixed and adjustable voltage applications makes it popular in the print circuits board (PCB) designs of many projects.

Application Fields Key

Thanks to its design, the LM317LCD is capable of delivering a regulated output current with very low ripple, over a range of output voltage and current. One of the most common uses for it is in the field of switch-mode power supply, where it can be utilized to produce a steady voltage flow and avoid oscillations. It is also used to regulate the output from an charger unit, and other DC/DC converters.

The LM317LCD’s wide range and adjustable current limit makes it suitable for items such as sunlights, air-conditioners, lighting systems, and even electric razors. Its extremely low noise output, shifting voltage, multi-stage short-circuit protection, and thermal stability make it a popular choice in consumer electronics, as well as in medical, industrial, and military applications.

The LM317LCD Working Principle

The LM317LCD can be constructed with or without output current limit. When it features an output current limit, it consists of an input impedance, a stable reference, and a series amplifier circuit, as well as an output impedance and an output voltage amplifier. The input impedance is a resistor which, along with the regulator IC, acts as an attenuator, allowing an input signal to pass through it into the amplifier and, eventually, get output from the IC. The feedback from the voltage regulator IC is directed towards the amplifier, which is connected to the reference voltage, and this reference voltage is used to tune the output voltage to match the input voltage.

The regulator also features a Thermistorm Control System which, when triggered, turns on the control transistor. This allows the regulated voltage to be provided directly to the output devices, with the differential input-output coming from the voltage regulator IC. The output of the regulator can then be adjusted with the help of a tuning capacitor, if necessary, depending on the type of application.

Given its wide range of functionalities and benefits, the LM317LCD has become one of the most and versatile regulators in the world. Its design and performance make it the perfect component for a variety of DC/DC converters, LED controllers, electric razors, and other consumer electronics.

The specific data is subject to PDF, and the above content is for reference