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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Figure 1 – LM Amplifier Schematic.
The package outline is standard dual-in-line. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws. The LM is also available in a pin package, which has greater dissipation and can provide more power. The datasheets don’t mention it, but there’s every chance that the ICs will oscillate if you fail to bypass the supply.
LMN/NOPB – Texas Instruments – PCB Footprint & Symbol Download
Production processing does not. The LM is a power audio amplifier for consumer. The 8-pin version of the LM is capable of around 1W, but that’s under ideal conditions. Products conform to specifications per the terms of the Texas. Production processing does not necessarily include testing of all parameters. The LM is similar, but uses 50k resistors at the inputs, and has two series resistors ohms and 1.
It usually won’t need to be datasheeh special, but it will usually have to be cheap and easy to build. Note that you cannot use aluminium because it can’t be soldered, but you may be able to use small copper tabs that are rivetted to an aluminium heatsink with heatsink compound between the two metals.
Two are needed, one for each side of the IC. Distortion is acceptable at around 0.
All pin numbers refer to daasheet pin LM and the LM The heatsink on the left is a commercial design which may be difficult to getmade by ‘Staver’ and is suggested for the LM – a xatasheet voltage version of the LM A unique input stage allows ground referenced input signals. Those shown in Figure 4 will normally be acceptable, or you can fabricate something yourself that makes good thermal contact with pins 3, 4, 5 and 10, 11, I’ve shown the LM with the same component values as the LM, and performance will be similar, but you can get higher power.
The input capacitor is optional – you can connect the source or pot wiper directly to the input pin if you prefer. I don’t think I even need to say that this IC isn’t suitable for a subwoofer. The bypass cap C2 is optional as well, but if you don’t include it the power supply rejection is rather poor, so anything other than a battery supply may cause some hum.
For best thermal performance, the heatsink s should be soldered directly to datasbeet pins, and ideally will also have a good thermal bond with the top of the IC package. While you may see it rated for up to 1W output, this is a little adventurous to put it mildly.
It’s worth mentioning that the above circuit can be simulated and will give the expected results, but you need to replace the upper NPN output transistor Q7 with a Darlington pair or you will not get symmetrical clipping.
The supply voltage needs to be no more than 12V and the load impedance should not be less than 8 ohms.
The 8-pin version is only suitable for low power similar to the LMbut the pin version can be fitted with small heatsink ‘flags’ that allow it to provide up to 2. If you want to know more, have a look at the datasheets.
LM386, LM380 & LM384 Power Amplifiers
The heatsink on the right can be fabricated from sheet copper, and I added two ‘spigots’ that can be datasneet into the PCB to stabilise the heatsink against vibration. These are certainly not hi-fi by any datasheet of the imagination, but they are fine for a utility amplifier where a bit of distortion is unlikely to be a deal-breaker. It is possible to use a ground-plane on a PCB as a heatsink, but it’s not very effective and you need a lot of area to get what is still a sub-standard heatsink.
Uses range from signal tracers, workshop monitor amps to listen to distortion residuals for exampleor just a simple project for the fun of it.
LM from Texas Instruments
There’s no doubt that a small amp with similar performance can be made using an opamp and a couple of transistors, but the total cost and component count will be a great deal higher than will be the case with one of these ICs. That means that the maximum input voltage will be around mV RMS sinewave at the onset of clipping.
The suggested heatsink designs are shown below. Add a resistor and capacitor in series between pins 1 and 8 for intermediate gains.
5-W Audio Power Amplifier
The circuit shown is only partially optimised for best performance. You can use either input for the signal, and simply dtaasheet the unused input. See SNAA for circuit details. Uses include simple phonograph amplifiers, intercoms, line drivers, teaching machine outputs, alarms, ultrasonic drivers, TV sound systems, AM-FM radio and sound projector systems. Commercial use is prohibited without express written authorisation from Rod Elliott.