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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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. The Datashheet can allegedly provide up to 5W, but don’t count on it. There’s no doubt that a small amp with similar performance can be made using an lj384n 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.

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.

While it looks very similar to the LM circuit shown above, note that the pin numbers are different. The output automatically self-centers to one-half the. These provide quite a bit of info, and lots of application circuits. However, the performance is datashheet that I doubt it would meet the required standards for professional use, and I have never seen an LM used in dxtasheet gear.

None are anything special, and they are fairly low power the LM is only rated for mW into 8 ohms. The input capacitor is optional – you can connect the source or pot wiper directly to the input pin if you prefer. The 8-pin version is shown first. Uses range from signal tracers, workshop monitor amps to listen to distortion residuals for exampleor just a simple project for the fun of it.


Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of.

5-W Audio Power Amplifier

Quiescent Output Voltage is at One Half of the. 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. Construction of any of these amps is non-critical, and Veroboard or similar is the way that most people would build one.

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. 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 circuit is shown for reference only, and is adapted from the datasheet but has been redrawn. Of the three types, the LM is the more popular.

The LM is available in two packages – 8-pin and pin. In order to hold system cost to a minimum, gain is internally fixed at 34 dB.

The quiescent output voltage is set internally to be half the supply voltage, and by default the gain is 20 26dB. The output is short-circuit proof with internal thermal limiting. 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. Two are needed, one for each side of the IC. The minimum useful voltage is around 6V, and 12V is the maximum suggested for the LM It usually won’t need to be anything special, but it will usually have to be cheap and easy to build.

See SNAA for circuit details.

The suggested heatsink designs are shown below. The preferred method is to make or buy copper heatsinks that can be soldered directly to the pins. Add a resistor and capacitor in series between pins 1 and 8 for intermediate gains. I don’t think I even need to say that this IC isn’t suitable vatasheet a subwoofer.


LMN/NOPB – Texas Instruments – PCB Footprint & Symbol Download

These are allegedly available, but I couldn’t find anything even remotely similar from my normal suppliers. That means that the maximum input voltage will be around mV RMS sinewave at the onset of clipping. The impedance at both inputs is 50k, set by internal resistors. However, that varies with supply voltage and load impedance so you’ll need to assess the circuit under your operating conditions.

The gain can be changed by adding a capacitor llm384n pins 1 and 8. I’ve shown the LM with the same component values as the LM, and performance will be similar, but you can get higher power.

LM from Texas Instruments

Production processing does not necessarily include testing of all parameters. All trademarks are the property of their respective owners. Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws. They are able to work with a signal that goes below zero volts Gnd because a PNP transistor is used. Products conform to specifications per the terms of the Texas.

Production datasheer does not. The supply voltage needs to be no more than 12V and the load impedance should not be less than 8 ohms. 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.

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. A copper lead frame is used with the center three pins on either side comprising a heat sink. You can use either input for the signal, and simply ground the unused input.