LM is guaranteed over a 0 C to a70 C temperature . Reproduction of TI information in TI data books or data sheets is permissible only if reproduction is. LM datasheet, LM circuit, LM data sheet: TI – OPERATIONAL AMPLIFIERS/BUFFERS,alldatasheet, datasheet, Datasheet search site for Electronic. Part Number: LM, Maunfacturer: National Semiconductor, Part Family: LM, File type: PDF, Document: Datasheet – semiconductor.

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From Wikipedia, the free encyclopedia. Because of this, the error term in the formula cannot be ignored and datasheeh value of the low-side resistor becomes more critical. Linear integrated circuits Voltage regulation. For large voltage differences, the energy lost as heat can ultimately dafasheet greater than that provided to the circuit. 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 “.

Wikimedia Commons has media related to LM and Voltage regulator circuits. Failure to do this may cause the circuit to short. Archived from the original PDF on 31 March Because some quiescent current flows from the adjustment pin of the device, an error term is added:. Retrieved from ” https: 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.


If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1.

National Semiconductor – datasheet pdf

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.

Archived from the original PDF on 18 April The output current is that resulting from dropping the reference voltage across the resistor.

Accidenti come scotta questo transistor. In other projects Wikimedia Commons. It was designed by Robert “Bob” Pease. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.

The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. The LM negative complement to the LM regulates voltages below, rather than above, the reference.

How the adjustment pin is connected dztasheet the output voltage as follows. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high.

LM312-155.52M Datasheet

Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. This is the trade-off for using linear regulators which are a lm321 way to provide a stable voltage with few additional components.


The LM has three pins: By using this site, you agree to the Terms of Use and Privacy Policy. The LM is an adjustable analogue to the popular 78xx fixed regulators.

The LM is a popular adjustable positive linear voltage regulator. This page was last edited on 6 Julyat 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 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. Archived from the original on 17 December The LM relates in the same way to the fixed 79xx regulators. Views Read Edit View history. Retrieved 31 March However, the 78xx device’s quiescent current is substantially higher and less stable.