LMK STEEL National Semiconductor datasheet pdf data sheet FREE Datasheets (data sheet) search for integrated circuits (ic), semiconductors and other. LMK STEEL. NATIONAL ative complement, see LM series data sheet. . LMA and LM Electrical Characteristics (Note 3). LMK STEEL/NOPB IC REG POSITIVE ADJ TO-3 National Semiconductor datasheet pdf data sheet FREE from Datasheet (data sheet).

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Retrieved from ” https: Archived from the original PDF on 31 March Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground. The LM is a popular adjustable positive linear voltage regulator.

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The LM negative complement to the LM regulates voltages below, rather than above, the reference. In packages with a heat-dissipating mounting tab, such as TOlmm317k 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 device can be configured to regulate the current to a load, rather than the voltage, by replacing the low-side resistor datashedt the divider with the load itself. Archived from the original PDF on 18 April In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. The LM is an adjustable analogue to the popular 78xx fixed regulators.



This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components.

It was designed by Robert “Bob” Pease.

Archived from the original on 17 December This page was last edited on 6 Julyat 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. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. 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 “.


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. Retrieved 31 March How the adjustment pin is connected determines the output voltage as follows. Accidenti come scotta questo transistor. The mechanism used is similar enough that a voltage divider can be used in the steel way as with the LM and the output follows the same formula, using the regulator’s fixed voltage for V ref e.


Wikimedia Commons has media related to LM and Voltage regulator circuits.

Linear integrated circuits Voltage regulation. Failure to do this may cause the circuit to short. Catasheet large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit.

Because some quiescent current flows from the adjustment pin of the device, an error term is added:. In other projects Wikimedia Commons.

By using this site, you agree to the Terms of Use and Privacy Policy. The LM has three pins: Linear regulators inherently waste power, the power dissipated is the current passed multiplied by ddatasheet voltage difference between input and output. 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 ,m317k higher and less stable.

The output current is that resulting from dropping the reference voltage across the resistor. From Wikipedia, the free encyclopedia. Views Read Edit View history.