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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Archived from the original on 17 December Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output dstasheet ground. How the adjustment pin is connected determines the output voltage as follows.

LMK Datasheet(PDF) – STMicroelectronics

The LM relates in the same way to the fixed 79xx regulators. Archived from the original PDF on 31 March The LM is a popular adjustable positive linear voltage regulator. However, the 78xx device’s quiescent current is substantially higher and less stable. Linear integrated circuits Voltage regulation.

The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. The alternative is to use a switching voltage regulator which is usually more efficient but has a larger footprint dataxheet requires a larger number of associated components.

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By using this site, you agree to the Terms of Use and Privacy Policy. The LM has three pins: Because some quiescent current flows from the adjustment pin of the device, an error term is added:.

Failure to do this may cause the circuit to short. 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.

Lm317k Data Sheet

The output current is that resulting from dropping the reference voltage across the resistor. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. It was designed by Robert “Bob” Pease.

Accidenti come scotta questo transistor. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.

Like the LM, each of the 78xx regulators is designed to adjust the output voltage until it is km317k fixed voltage above the adjustment pin which in this case is labelled ” ground “. The LM is an adjustable analogue to the popular 78xx fixed regulators.

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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. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of lm3177k.

In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. Retrieved 31 March Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Wikimedia Commons has media related to LM and Voltage regulator circuits. Archived from the original PDF on 18 April Views Read Edit View history. The LM negative complement to the LM regulates voltages below, rather than above, the reference.

This page was last edited on 6 Julyat Retrieved from ” https: 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.

From Wikipedia, the free encyclopedia.