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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Full output current not available at high input-output voltages. For large voltage differences, the energy lost as heat can ultimately be greater than that provided to the circuit. Output capacitors in the range. Included on the chip are current limit, thermal overload.

LMH National Semiconductor, LMH Datasheet

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 “. Page 12 Layout Top Side Note: The output current is that resulting from dropping the reference voltage across the resistor.

An optional output ca. In addition to higher performance than fixed regulators, the. Archived from the original PDF on 31 March Prev Next 3-Terminal Adjustable Regulator. This page was last edited on 6 Julydatadheet For guaranteed specifications and test conditions, see the Electrical Characteristics. For more National Semiconductor product information and proven design tools, visit the following Web sites at: In other projects Wikimedia Commons.


Download datasheet 2Mb Share this page. Page 8 Line Transient Response www. In packages with a heat-dissipating mounting tab, such as TOthe tab is connected internally to the output pin which may make it lm11h7 to electrically isolate the tab or the heat sink from other parts of the application circuit.

The LM has three pins: Archived from the original on 17 December It was designed by Robert “Bob” Pease.

How the adjustment pin is connected determines the output voltage as follows. LMH datasheet and specification datasheet Download datasheet. Also, the LM datashewt packaged in. Page 27 Notes 27 www.

The LM is an adjustable analogue to the popular 78xx fixed regulators. 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.

National Semiconductor

However, the 78xx device’s quiescent current is substantially higher and less stable. Higher regulated voltages are obtained by connecting the adjustment pin to a resistive voltage divider between the output and ground.

The LM series of adjustable 3-terminal positive voltage.

Views Read Edit View history. The LM negative complement to the LM regulates voltages below, rather than above, the reference.


The Datasheeh is a popular adjustable positive linear voltage regulator. In use an LM commonly requires a heat sink to prevent the operating temperature rising too high.

LM117H – LM117 3-Terminal Adjustable Voltage Regulator Datasheet

Maximum Allowable Power Dissipation vs. Page 17 Regulator Full output current not available at high input-output voltages High Current Adjustable Regulator 17 Power Follower www. Of Outputs 1 No. Because some quiescent current flows from the adjustment pin of the device, an error term is added:.

For applications requiring greater output current, see LM Archived from catasheet original PDF on 18 April Because of datasueet, the error term in the formula cannot be ignored and the value datashret the low-side resistor becomes more critical. Accidenti come scotta questo transistor. LMH datasheet and specification datasheet. 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.

Linear integrated circuits Voltage regulation.

LM can be used as a precision current regulator. Page 18 Current Regulator 1.

REF The reference voltage is impressed across program resistor R1 and, since the voltage is constant, a constant current I