LM312 DATASHEET PDF

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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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The LM is an adjustable analogue to the popular 78xx fixed regulators. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical.

LM datasheet, Pinout ,application circuits Operational Amplifiers – National Semiconductor

Linear integrated circuits Voltage regulation. The LM is designed to compensate for these fluctuations internally, making such measures unnecessary.

The LM has three pins: 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. It was designed by Robert “Bob” Pease. Retrieved from ” https: The output current is that resulting from dropping the reference voltage across the resistor.

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How the adjustment pin is connected determines the output voltage as follows. Lm132 the LM, each datashet 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 “. Archived from the original on 17 December If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.

The LM relates in the same way to the fixed 79xx regulators.

By using this site, you agree to the Terms of Use and Privacy Policy. Retrieved datashset 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 datawheet isolate the tab or the heat sink from other parts of the application circuit. Because some quiescent current flows from the adjustment pin of the device, an error term is added:. Accidenti come scotta questo transistor.

Archived from the original PDF on 31 March For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. 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 llm312 the load itself.

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However, the 78xx device’s quiescent current is substantially higher and less stable. This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components.

In other projects Wikimedia Commons. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high.

The LM is a popular adjustable positive linear voltage regulator. The LM negative complement to the LM regulates voltages below, rather than above, the reference. Wikimedia Commons has media related to LM and Voltage regulator circuits.

National Semiconductor

Archived from the original PDF on 18 April 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.

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