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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This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components.
If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1.
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. 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 “.
Failure to do this may cause the circuit to short.
Operational Amplifiers – National Semiconductor
Accidenti come scotta questo transistor. This page was last edited on 6 Julyat The LM is designed to compensate for these fluctuations internally, making such measures unnecessary.
Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.
The LM negative complement to the LM regulates voltages below, rather than above, the reference. The LM is a popular adjustable positive linear voltage regulator. However, the 78xx device’s quiescent current is substantially higher and less stable.
Archived from the original PDF on 18 April For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. Linear integrated circuits Voltage regulation.
In use an LM commonly requires a dattasheet sink to prevent the operating temperature rising too high. The LM relates in the same way to the fixed 79xx regulators. How the adjustment pin is connected determines the output voltage datashwet follows.
Retrieved from ” https: ,m312 Commons has media related to LM and Voltage regulator circuits.
It was designed by Robert “Bob” Pease. Archived from the original PDF on 31 March In other projects Wikimedia Commons.
The LM is an adjustable analogue to the popular 78xx fixed regulators. Views Read Edit View history. The LM has three pins: The output current is that resulting from dropping the reference voltage across the resistor.
Archived from the original on 17 December Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. Retrieved 31 March 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.
National Semiconductor – datasheet pdf
Because some quiescent current flows from the adjustment pin of the device, an error term is added:. 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 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.