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LM317K DATASHEET PDF

LMK STMicroelectronics Linear Voltage Regulators V Adj Positive datasheet, inventory, & pricing. LMK datasheet, LMK pdf, LMK data sheet, datasheet, data sheet, pdf, SemeLAB, A Adjustable Positive Voltage Regulator. STMicroelectronics LMK: 51 available from 3 distributors. Explore Integrated Circuits (ICs) on Octopart: the fastest source for datasheets, pricing, specs and.

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LMK Datasheet(PDF) – STMicroelectronics

How the adjustment pin is connected determines the output voltage as follows. The alternative is to use a switching voltage regulator which is usually more efficient but has a larger footprint and requires a larger number of associated components.

The LM has three pins: In other projects Wikimedia Commons.

It was designed by Robert “Bob” Pease. This page was last edited on 6 Julyat darasheet Retrieved 31 March This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. The output current is that resulting from dropping the reference voltage across the resistor. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary.

The LM relates in the same way to the fixed 79xx regulators. However, the 78xx device’s quiescent current is substantially higher and less stable. Wikimedia Commons has media related to LM and Voltage regulator circuits.

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Lm317k Data Sheet

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. Archived from the original on 17 December From Wikipedia, the free encyclopedia.

Like the LM, each of the 78xx regulators is designed to adjust the output voltage until it is some fixed voltage above the adjustment pin which in this case is labelled ” ground “. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.

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 Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Accidenti come scotta questo transistor.

In packages with a heat-dissipating mounting tab, such as TOthe tab is 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.

LM Datasheet and Product Info | Analog Devices

Archived from the original PDF on 31 March Because some quiescent current flows from the adjustment pin of the device, an error term is added:. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. For lm317j voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. By using this site, you agree to the Terms of Use and Privacy Policy. The LM is an adjustable analogue to the popular 78xx fixed regulators.

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Failure to do this may cause the circuit to short. Views Read Edit View history. The LM negative complement to the LM regulates voltages below, rather than above, the reference. Linear integrated circuits Voltage regulation.

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 is a popular adjustable positive linear voltage regulator.

Retrieved from ” https: Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.