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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5-W Audio Power Amplifier

The heatsink on the right can be fabricated from sheet copper, and I added two ‘spigots’ that can be inserted into the PCB to stabilise the heatsink against vibration. The output automatically self-centers to one-half the supply voltage. Production processing does not necessarily include testing datasjeet all parameters.

The only thing that even approaches being critical is the bypass cap.

The gain can be changed by adding a capacitor between lm384b 1 and 8. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of. 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, The circuit shown is only partially optimised for best performance.

C5 is a supply bypass cap, and it should be as close to the supply pins as possible. Add a dztasheet and capacitor in series between pins 1 and 8 for intermediate gains.

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That means that the maximum input voltage will be around mV RMS sinewave at the onset of clipping. The output is short-circuit proof with internal thermal limiting.

I don’t think I even need to say that this IC isn’t suitable for a subwoofer. The datasheets don’t mention it, but there’s every chance that the ICs will oscillate if you fail to bypass the supply.

The LM can allegedly provide up to 5W, but don’t count on it. For best thermal performance, the heatsink s should be soldered directly to the pins, and ideally will also have a good thermal bond with the top of the IC package. The output is short-circuit proof with internal thermal.


The load impedance needed is higher than any small speakers you can get, and you simply don’t build an amp using an LM if you need more than a few milliwatts. It would be worthwhile to give it a very light spray with matte black paint to improve radiation.

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. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws.

Datashwet 1 – LM Amplifier Schematic.

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 Zobel network at the output is needed to ensure stability when leads are attached, but even if the speaker is only a few millimetres away, don’t leave it out or the amp may oscillate. The output automatically self-centers to one-half the. These are allegedly available, but I couldn’t find anything even remotely similar from my normal suppliers.

These are certainly not lm384j by any stretch of the imagination, but they are fine for a utility amplifier where a bit of distortion is unlikely to be a deal-breaker. Products conform to specifications per the terms of the Texas.

The 8-pin datahseet is shown first. Texas Instruments semiconductor products and disclaimers thereto appears at the end of lm384h data sheet.

Feel free to include a nF multilayer ceramic bypass cap as close to the supply pins as possible it’s not shown in the above drawings. While a PCB would be handy, the cost of the board would be greater than the cost of the IC and other parts and it’s not worthwhile. 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.


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

The 8-pin version of the LM is capable of around 1W, but that’s under ideal conditions. All pin numbers refer to the pin LM and the LM They can be run without a heatsink, but only for low power output, and care is needed to ensure the IC doesn’t overheat.

Despite the fact that many of its functions appear to be almost identical to the LM, the two are quite different and even the 8-pin versions of each have different pinouts and are not interchangeable.

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.

This makes the device easy satasheet use in standard p-c layout. Distortion is acceptable at around 0. The IC is useful for headphones, intercoms, portable radios etc. 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 preferred method is to make or buy copper heatsinks that can be soldered directly to the pins.

The impedance at both inputs is 50k, set by internal resistors. 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.

You can use either input l384n the signal, and simply ground the unused input. The LM is available in two packages – 8-pin and pin. The input capacitor is optional – you can connect the source or pot wiper directly to the input pin if you prefer.

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