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 31 March How the adjustment pin is connected determines the output voltage as follows. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. 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. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit.

The LM has three pins: 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.

LMK STEEL Datasheet National Semiconductor pdf data sheet FREE from

The LM relates in the same way to the fixed 79xx regulators. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.


From Wikipedia, the free encyclopedia. Linear integrated circuits Voltage regulation. The LM is an adjustable analogue to the popular 78xx fixed regulators.

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 output current is that resulting from dropping the reference voltage across the resistor.

Archived from the original PDF on 31 March In other projects Wikimedia Commons. The LM negative complement to the LM regulates voltages below, rather than above, the reference.


It was designed by Robert “Bob” Pease. Accidenti come scotta questo transistor.

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 designed to compensate for these fluctuations internally, dtasheet such measures unnecessary.

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 “. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. By using this site, you agree eatasheet the Terms of Use and Privacy Policy. Views Read Edit View history.

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LMK STEEL Datasheet pdf – 3-Terminal Adjustable Regulator – National Semiconductor

Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground. The LM is dataseet popular adjustable positive linear voltage regulator.

This page was last edited on 6 Julyat Wikimedia Commons has media related to LM and L3m17k regulator circuits. Failure to do this may cause the circuit to short. This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components.

Linear regulators inherently waste power, the power dissipated is the current passed multiplied dattasheet the voltage difference between input and output. Because some quiescent current flows from the adjustment pin of the device, an error term is added:. Retrieved from ” https: However, the 78xx device’s quiescent current is substantially higher and less stable. Archived from the original PDF on 18 April Archived from the original on 17 December