LM317K DATASHEET PDFLM317K 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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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. Failure to do this may cause the circuit to short. The LM negative complement to the LM regulates voltages below, rather than above, the reference.

The output current is that resulting from dropping the reference voltage across the resistor. 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 designed to compensate for these fluctuations internally, making such measures unnecessary.

Retrieved from ” https: 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. Linear integrated circuits Voltage regulation. Archived from the original PDF on 31 March 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 “.

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Lm317k Data Sheet

This page was last edited on 6 Julyat 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.

The LM relates in the same way to the fixed 79xx regulators. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. Archived from the original on 17 December The LM is a popular adjustable positive linear voltage regulator.

Accidenti come scotta questo transistor.

LM Datasheet and Product Info | Analog Devices

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. From Wikipedia, the free encyclopedia. By using this site, you agree to the Terms of Use and Privacy Policy.

This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. Views Read Edit View history. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. However, the 78xx device’s quiescent current is substantially higher and less stable. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high.

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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.

Because some quiescent current flows from the adjustment pin of the device, an error term is added:. It was designed by Robert “Bob” Pease.

The LM has three pins: Wikimedia Commons has media related to LM and Dstasheet regulator circuits. How the adjustment pin is connected determines the output voltage as follows.

The LM is an adjustable analogue to the popular 78xx fixed regulators. Retrieved 31 March For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit.