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The LM is an adjustable analogue to the popular 78xx fixed regulators.

Lm317k Data Sheet

By using this site, you agree to the Terms of Use and Privacy Policy. The alternative is to use a switching voltage regulator which is usually more efficient but has datashdet larger footprint and requires a larger number of associated components. The device can be configured to regulate the current to a load, rather than the voltage, by replacing the low-side resistor of the divider with the load itself.

The LM has three pins: How the adjustment pin is connected determines the output voltage as follows. Retrieved from ” https: The output current is that resulting from dropping the reference voltage across the resistor.

Accidenti come scotta questo transistor. Archived from the original PDF on 31 March It was lmm317k by Robert “Bob” Pease. This page was last edited on 6 Julyat Like the LM, each of the 78xx regulators is designed to adjust datadheet output voltage until it is some fixed voltage above the adjustment pin which in this case is labelled ” ground “.


In use an LM commonly requires a heat sink to prevent the operating xatasheet rising too high. The mechanism used is similar enough that a voltage divider can be used in the same way as with the LM and the output follows the same formula, using the regulator’s fixed voltage for V ref e.

The LM is a popular adjustable positive linear voltage regulator.

Failure to do this may cause the circuit to short. This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. Linear integrated circuits Voltage regulation. However, the 78xx device’s quiescent llm317k is substantially higher and less stable.

LM Datasheet and Product Info | Analog Devices

Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Retrieved 31 March Wikimedia Commons has media related to LM lm317 Voltage regulator circuits.


Archived from the original on 17 December In other projects Wikimedia Commons. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground. The LM relates in the same way to the fixed 79xx regulators.

LMK Datasheet(PDF) – STMicroelectronics

Views Read Edit View history. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary.

In packages with a heat-dissipating mounting tab, such as TOthe tab datasheeg connected internally to the output pin which may make it necessary to electrically isolate the tab or the heat sink from other parts of the application circuit. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit.

If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. Archived from the original PDF on 18 April The LM negative complement to the LM regulates voltages below, rather than above, the reference.

Because some quiescent current flows from the adjustment pin of the device, an error term is added:. From Wikipedia, the datasheey encyclopedia.