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.
|Published (Last):||15 March 2005|
|PDF File Size:||20.16 Mb|
|ePub File Size:||2.99 Mb|
|Price:||Free* [*Free Regsitration Required]|
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 datashet tab or the heat sink from other parts of the application circuit. Archived from the original on 17 December The LM is designed to compensate for these fluctuations internally, making such measures unnecessary. From Wikipedia, the free encyclopedia.
Linear integrated circuits Voltage regulation. Views Read Edit View history.
Operational Amplifiers – National Semiconductor
However, the 78xx device’s quiescent current is substantially higher and less stable. How the adjustment pin is connected determines l3m12 output voltage as follows. It was designed by Robert “Bob” Pease. The LM relates in the same way to the fixed 79xx regulators. Retrieved from ” https: Retrieved 31 March The LM is a popular adjustable positive linear voltage regulator.
LM Datasheet pdf – Operational Amplifier – National Semiconductor
This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. 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 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 daasheet with datashert load itself.
Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.
Failure to do daatasheet may cause the circuit to short. 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. Archived from the original PDF on 31 March This page was last edited on 6 Julyat For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit.
The LM is an adjustable analogue to the popular 78xx fixed regulators. The output current is that resulting from dropping the reference voltage across the resistor. Accidenti come scotta questo transistor.
If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. Because some quiescent current flows from the adjustment lm132 of the device, an error term is added:.
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 negative datasheet to the LM regulates voltages below, rather than above, the reference. Linear regulators inherently waste power, the power dissipated is the catasheet passed multiplied by the voltage difference between input and output.
Wikimedia Commons has media related to LM and Voltage regulator circuits. 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.