The LM series of adjustable 3-terminal positive voltage ative complement, see LM series data sheet. LM/LMA/LM Package Options. Part. Datasheets, LM/N Datasheet. Design Resources, Development Tool Selector. Featured Product, LMSeries, Adjustable, Three-Pin Positive Voltage. LMH Datasheet, LM National Semiconductor 3-Terminal Adjustable Voltage Regulator Datasheet.
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Normally, no capacitors are needed unless the device is sit.
LM can be used as a precision current regulator. Of Outputs 1 No.
For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and lm1117h. Retrieved from ” https: LMH datasheet and specification datasheet Download datasheet.
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.
Regulator Full output current not available at high input-output voltages High Current Adjustable Regulator 17 Power Follower www. The LM series of adjustable 3-terminal positive voltage.
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 dataasheet load itself. Wikimedia Commons has media related to LM and Voltage regulator circuits. 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. Page 17 Regulator Full output current not available at high input-output voltages High Current Adjustable Regulator 17 Power Follower www.
Also, it makes an especially simple adjustable switching reg. Linear regulators inherently waste power, the power dissipated is the current passed multiplied by the voltage difference between input and output. How the adjustment pin is connected determines the output voltage as follows.
Application Hints In operation, the LM develops a nominal 1. Archived from the original PDF on 18 April All other trademarks are the property of their respective owners.
The LM is an adjustable analogue to the popular 78xx fixed regulators. If the adjustment pin is connected to ground the output pin delivers a regulated voltage of 1. From Wikipedia, the free encyclopedia.
It was designed by Robert “Bob” Pease. Also, the LM is packaged in. Page 12 Layout Top Side Note: Because some quiescent current flows from the adjustment pin of the device, an error term is added:. Full output current not available at high input-output voltages. Output capacitors in the range. Because of this, the error term in the formula cannot be ignored and the value of the low-side resistor becomes more critical. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high.
The LM negative complement to the LM regulates voltages below, rather than above, the reference. Like datasueet 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 “. Prev Next 3-Terminal Adjustable Regulator. For more National Semiconductor product information and proven design tools, visit the following Web sites at: Failure to do this may cause the circuit to short.
The LM has three pins: This page was last edited on 6 Julyat For guaranteed specifications and test eatasheet, see the Electrical Characteristics. The output current is that resulting from dropping the reference voltage across the resistor.
Maximum Allowable Power Dissipation vs.
Download datasheet 2Mb Share this page. Besides replacing fixed regulators, the LM is useful in a. Further, both line and load regulation are better than. The guaranteed specifications apply only for the test conditions listed. 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.
For applications requiring greater output current, see LM Archived from the original on 17 December In lm117n projects Wikimedia Commons. Included on the chip are current limit, thermal overload.