Application Hints In operation, the LM develops a nominal 1. REF The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I Maximum Allowable Power Dissipation vs. Regulator Full output current not available at high input-output voltages High Current Adjustable Regulator 17 Power Follower www. Current Regulator 1. For more National Semiconductor product information and proven design tools, visit the following Web sites at: www.

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Views Read Edit View history. Archived from the original on 17 December This is the trade-off for using linear regulators which are a simple way to provide a stable voltage with few additional components. The LM is designed to compensate for these fluctuations internally, making eteel measures unnecessary. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1.

The LM negative complement to the LM regulates voltages below, rather than above, the reference. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output.

This adtasheet was last edited on 6 Julyat The LM relates in the same way to the fixed 79xx regulators. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.

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. In other projects Wikimedia Commons. Wikimedia Commons has media related to LM and Voltage regulator circuits. How the adjustment pin is connected determines the output voltage as follows. Retrieved vatasheet March Datasheet LM has three pins: Failure to do this may cause the circuit to short.

The LM is a popular adjustable positive linear voltage regulator. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. Archived from the original PDF datsaheet 31 March 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. Linear integrated circuits Voltage regulation. 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. Accidenti come scotta questo transistor.

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 datasbeet.

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National Semiconductor LM317K Variable Voltage Regulator TO3 Transistor OMA064A

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LM317K STEEL/NOPB - Linear voltage regulator 1.2...37 V TO-3, LM317, Texas Instruments

Further, both line and load regulation are better than standard fixed regulators. PDF , 4. Extract from the document. PDF , 75 Kb , File published: May 8, The power limitations of the physical packaging for a linear regulator device can limit the total output current or the input-to-output voltage differential. This inherent limitation is not always apparent from the product data sheet and must be evaluated during the design phase.


LM317K STEEL/NOPB National Semiconductor, LM317K STEEL/NOPB Datasheet





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