LMN/NOPB Texas Instruments Audio Amplifiers 5-W AUDIO POWER AMP datasheet, inventory, & pricing. LMN Datasheet, LMN National Semiconductor 5-Watt Audio Amplifier Datasheet, buy LMN. The LM is a power audio amplifier for consumer applica- tion In order to hold system cost to a minimum gain is internally fixed at 34 dB A unique input stage.

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They are able to work with a signal that goes below zero volts Gnd because a PNP transistor is used. None are anything special, and they are fairly low power the LM is only rated for mW into 8 ohms.

The circuit shown is only partially optimised for best performance. The LM can allegedly provide up to 5W, but don’t count on it. A copper lead frame is used with the center three pins on either side comprising a heat sink.

LMN datasheet, Pinout ,application circuits 5-W Audio Power Amplifier

I’ve shown the LM with the same component values as the LM, fatasheet performance will be similar, but you can get higher power. Add a resistor and capacitor in series between pins 1 and 8 for intermediate gains.

In order to hold system cost to a.

Figure dwtasheet – LM Amplifier Schematic. Of the three types, the LM is the more popular. Maximum output power into an 8 ohm load is around mW for acceptable distortion.

The tabs solder to the IC pins, and the underside of the heatsink should be coated with heatsink compound to increase the thermal conductivity. The LM is also available in a pin package, which has greater dissipation and can provide more power. All pin numbers refer to the pin LM and the LM The author Rod Elliott grants the reader the right to use this information for personal use only, and further allows that one 1 copy may be made for reference while constructing the project.


The bypass cap C2 is optional as well, but if you don’t include it the power supply rejection is km384n poor, so anything other than a battery supply may cause some hum.

LM386, LM380 & LM384 Power Amplifiers

The negative input signal doesn’t get cut off as you might expect, because the emitter is still positive. I don’t think I even need to say that this IC isn’t suitable for a subwoofer.

The suggested heatsink designs are shown below. The circuit is shown for reference only, and is adapted from the datasheet but has been redrawn. They can be run without a heatsink, but only for low power output, and care is needed to ensure the IC doesn’t overheat. The output automatically self-centers to one-half the supply voltage. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws.

For datazheet thermal performance, the datzsheet s should be soldered directly to the pins, and ideally will also have a good thermal bond with the top of the IC package.

It would be worthwhile to give it a very light spray with matte black paint to improve radiation.

Feel free to include a nF multilayer ceramic bypass cap as close to the supply datashest as possible it’s not shown in the above drawings. Production processing does not necessarily include testing of all parameters. A copper lead frame is used with the center three. Uses include simple phonograph amplifiers, lm38n4, line drivers, teaching machine outputs, alarms, ultrasonic drivers, TV sound systems, AM-FM radio and sound projector systems.


The 8-pin version of the LM is capable of around 1W, but that’s under ideal conditions.

Quiescent Output Voltage is at One Half of the. Production processing does not. The output is short-circuit proof with internal thermal limiting. The only thing that even approaches being critical is the bypass cap.

These are allegedly available, but I couldn’t find anything even remotely similar from my normal suppliers. It should be easy enough to fabricate a suitable heatsink if you have some sheet copper available. You can use either input for the signal, and simply ground the unused input. However, that varies with supply voltage and load impedance so you’ll need to assess the circuit under your operating conditions.

The datasheets don’t mention it, but there’s every chance that the ICs will oscillate if you fail to bypass the supply. The quiescent output voltage is set internally to be half the supply voltage, and by default the gain is 20 26dB. Products conform to specifications per the terms of the Texas. That’s one of the reasons that the higher voltage ICs LM and LM have a higher gain than the LM – it’s simply to ensure full output swing before the input stage causes distortion.

Uses range from signal tracers, workshop monitor amps to listen to distortion residuals for exampleor just a simple project for the fun of it. The package outline is standard dual-in-line. While it looks very similar to the LM circuit shown above, note that the pin numbers are different.