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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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 bypass cap C2 is optional as well, but if you don’t include it the satasheet supply rejection is rather poor, so anything other than a battery supply may cause some hum. Construction of any of these amps is non-critical, and Veroboard or similar is the way that most people would build one. For best thermal performance, the heatsink s should be soldered directly to the pins, and ideally will also dxtasheet a good thermal bond with the top of the IC package.

Distortion is acceptable at around 0.

LMN Datasheet(PDF) – TI store

The circuit is shown for reference only, and is l,384n from the datasheet but has been redrawn. Uses include simple phonograph amplifiers, intercoms, line drivers, teaching machine outputs, alarms, ultrasonic drivers, TV sound systems, AM-FM radio and sound projector systems.

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. Input stage distortion will not occur until the input signal peak exceeds mV or so, and daasheet far more than necessary given the gain of the IC.

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.

See SNAA for circuit details. The quiescent output voltage is set internally to be half the supply voltage, and by default the gain is 20 26dB. In order to hold system cost to a. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of. 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.


Probably the lm384b interesting thing to look at is the input stages. The minimum useful voltage is around 6V, and 12V lm34n the maximum suggested for the LM That’s one of the reasons that llm384n higher voltage ICs LM and LM have a higher gain than the LM – it’s simply to ensure lm3384n output swing before the input stage causes distortion.

Maximum output power into an 8 ohm load is around mW for acceptable distortion. The suggested heatsink designs are shown below. The heatsink on the left is a commercial design which may be difficult to getmade by ‘Staver’ and is suggested for the LM – a higher voltage version of the LM That means that the maximum input voltage will be around mV RMS sinewave at the onset of clipping.

datasheer Commercial use is prohibited ln384n express written authorisation from Rod Elliott. The supply voltage needs to be no more than 12V and datsaheet load impedance should not be less than 8 ohms. The IC is useful for headphones, intercoms, portable radios etc. These are certainly not hi-fi 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.

The LM can allegedly provide up to 5W, but don’t count on it. All trademarks are the property of their respective owners. The only thing that even approaches being critical is the bypass cap.

LM or LM can use a supply voltage of 10V up to 22V or 26V respectively, but don’t even think about it if you don’t include heatsinks. Production processing does not. The 8-pin version of the LM is capable of around datashret, but that’s under ideal conditions.

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. It’s important to understand that the LM is not an opamp, and none of the traditional opamp circuits can be applied. They are able to work with a signal that goes below zero volts Gnd because a PNP transistor is used. While it looks very similar to the LM circuit shown above, note that the pin numbers are different.

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The output is short-circuit proof with internal thermal limiting. None are anything special, and they are fairly low power the LM is only rated for mW into 8 ohms. It’s theoretically possible if you use a high supply voltage and a 16 or 32 ohm load, but that’s not recommended because device dissipation will be well in excess of that which the device can handle safely.

The LM is also available in a pin package, which has greater dissipation and can provide more power. 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.

5-W Audio Power Amplifier

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.

While you may see it rated for up to 1W output, this is a little adventurous to put it mildly. However, that varies with supply voltage and load impedance so you’ll need to assess the circuit under your operating conditions. These are allegedly available, but I couldn’t find anything even remotely similar from my normal suppliers. A unique input stage allows ground referenced input signals.

All pin numbers refer to the pin LM and the LM I don’t think I even need to say that this IC isn’t suitable for a subwoofer. In order to hold system cost to a minimum, gain is internally fixed at 34 dB. It should be easy enough to fabricate a suitable heatsink if you have some sheet copper available. It usually won’t need to be anything special, but it will usually have to be cheap and easy to build. Products conform to specifications per the terms of the Texas.