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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How the adjustment pin is connected determines the output voltage as follows. 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.

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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. Archived from the original on 17 December Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.

In other projects Wikimedia Commons. Because some quiescent current flows from the adjustment pin of the device, an error term is added:. The LM is datashset to compensate for these fluctuations internally, making such measures unnecessary. Views Read Edit View history.


LMK STEEL Datasheet National Semiconductor pdf data sheet FREE from

It was designed by Robert “Bob” Pease. The output current is that resulting from dropping the reference voltage across the resistor.

From Wikipedia, the free encyclopedia. By using this site, you agree to the Terms of Use and Privacy Policy. Archived from the original PDF on 31 March This page was last edited on 6 Julyat However, the 78xx device’s quiescent current is substantially higher and less stable. Archived from the original PDF on 18 April 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.

This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. The LM relates in the same way to the fixed 79xx regulators. The LM is an adjustable analogue to the popular 78xx fixed regulators.

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 “.


Linear integrated circuits Voltage regulation. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. The LM has three pins: 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. Wikimedia Commons has media related to LM and Voltage regulator circuits.

Retrieved from ” https: The LM negative complement dagasheet the LM regulates voltages below, rather than above, the reference. 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.


Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Failure to do this may cause the circuit to short. Retrieved 31 March The LM is a popular adjustable positive linear voltage regulator.

Accidenti come scotta questo transistor.