LM317DCYR

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LM317DCYR is a monolithic integrated voltage regulator designed for applications such as personal computers, telecommunications and instrumentation. It is a 3-terminal, low power adjustable voltage regulator capable of supplying up to 1.5A output current. LM317DCYR features a wide input voltage range of 2.5V to 37V and a wide output voltage range of 0.8V to 37V. It also features an extremely low dropout voltage, low noise and low quiescent current.

Application Field

LM317DCYR is suitable for any application where an adjustable voltage regulator with a current large enough to meet the demands of a specific application is required. Typical examples include battery-powered devices and portable devices, such as MP3 players and PDAs. Also, LM317DCYR is suitable for automotive applications, where low quiescent current and low output voltage variations are desirable. Moreover, it is also suitable for industrial control systems and fixed voltage applications, especially those requiring improved transient response performance such as microprocessor-based systems.

Working Principle

The LM317DCYR is an adjustable voltage regulator that is based on a feedback system which regulates the output voltage. This is achieved by measuring the output voltage through a feedback line and then adjusting the internal reference voltage accordingly. The output voltage is then determined by a resistor divider which converts the reference voltage to the desired output voltage. The whole regulator is driven by a single input power supply, typically of 7-40V.

The LM317DCYR is equipped with a wide range of protection features that include over-temperature protection, switch-on current limiting and line transient protection. The over-temperature protection will limit the temperature within the device to prevent possible damage. The switch-on current limiting ensures that no excessive currents flow through the device during start-up. The line transient protection provides protection from any sudden surges of current on the input line.

A common application of the LM317DCYR is as a constant current source. The current is set by selecting the appropriate value of the sense resistor. The main advantage of using the LM317DCYR as a constant current source is its versatile ability to select an appropriate value for the current by simply changing the resistor value.

In conclusion, LM317DCYR is an ideal choice for applications requiring an adjustable voltage regulator with low noise and low quiescent current. Thanks to its wide input voltage range and protection features, it is suitable for a variety of application scenarios such as personal computers, communications and automotive. Moreover, thanks to its low dropout voltage and wide output range, it can deliver precise outputs even with very low input voltage variations.

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