LM LMA LM 3-Amp Adjustable Regulators. General Description. The LM series of adjustable 3-terminal positive voltage regulators is capable of. APPLICATION HINTS. In operation, the LM develops a nominal V reference voltage, V(ref), between the output and adjustment terminal. The reference. The LM is an adjustable 3-terminal positive voltage regulator capable of supplying in excess of A over an output voltage range of V to.

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We use only 2 resistors to control the output voltage. The LM is best for you. Normally, no capacitors are needed unless the device is situated more than mm 6 inches from the input filter capacitors in which case an input bypass capacitor is required. Over and Under voltage protection of electrical dataseet July 11, Simple Crystal oscillator Circuit using 74LS04 November daasheet, Transistor stereo bass booster September 15, We can set the output voltage with only two external resistors.

Also, its pin output connects the heatsink surface. Learn how your comment data is processed. You can buy at mouser. Solid tantalum capacitors can be used on the voltage output to improve the ripple rejection of the voltage regulator.

Many electronics circuits and projects for learning datasheef simple ways.

National Semiconductor

We can use the LM on a wide variety of applications. With connecting a fixed resistor between the adjust and output.


The adjustment terminal of the regulator can be bypassed to achieve very high ripple rejection. The LM voltage regulators can provide up to 1. We have many ways to make it. Please update your bookmarks.

Even small capacitors can have a low enough internal series resistance to be able to deliver 20A spikes when shorted. As in the LM pinout above. Although the surge is very short in duration, there is enough energy to damage parts of the regulator IC. You don’t want to use too high an input voltage as the excess will need to be dissipated as heat through the regulator.

Since it has high current over 3A, we must mount the LM on the large heatsink. Leave a Reply Cancel reply. In addition, it uses internal current limiting, thermal shutdown, and safe mode. To determine the output voltage, enter values for the program R 1 and set R 2 resistors and hit the “Calculate” button. Because you like many circuits to make on your working.

An optional output capacitor can be added to improve transient response. Which it looks like a popular LM If you want to try it. However, other values such as or ohms can also be used for R 1. The dropout voltage of the IC regulator is about 1.

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The LM may be boring for you. Basic to use LM We love it because easy to use. Last update 6 January It looks much like the popular LM Because it is the adjustable three terminal positive voltage regulator. See the voltage regulator datasheets above for specific details regarding the dropout voltage and heatsink requirements. Created 28 July This site uses Akismet to reduce spam. But It can supply the output current over 3. No protection diodes are required for output voltages of less than 25V or greater than 10 uF capacitance.

A precision current regulator. If you are looking for 3A adjustable power supply.

LM Datasheet Motorola pdf data sheet FREE from

Where greater output current is required, the LM series regulators are suitable up to datashet and the LM series voltage regulators for up to 5A of output. When external capacitors are used with a voltage regulator it may be necessary to use protection diodes to prevent the capacitors from discharging datxsheet low current points into the voltage regulator. Plan to be about 3V about the desired output voltage. A programmable output regulator. This is an LM Datasheet.

You see LM circuit below. For example A simple adjustable switching regulator.