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.

Author: Dazuru Faejin
Country: Uzbekistan
Language: English (Spanish)
Genre: Environment
Published (Last): 27 September 2007
Pages: 451
PDF File Size: 4.50 Mb
ePub File Size: 14.88 Mb
ISBN: 928-1-19632-331-5
Downloads: 85916
Price: Free* [*Free Regsitration Required]
Uploader: Nanris

The only thing that even approaches being critical is the bypass cap. Probably the most interesting thing to look at is the input stages.

HTTP This page has been moved

While a PCB would be handy, the cost of the board would be datzsheet than the cost of the IC and other parts and it’s dataheet worthwhile. They are able to work with a signal that goes below zero volts Gnd because a PNP transistor is used. A copper lead frame is used with the center three. Commercial use is prohibited without express written authorisation from Rod Elliott.

That means that the maximum input voltage will be around mV RMS sinewave at the onset of clipping.

The gain can be changed by adding a capacitor between pins 1 and 8. 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 All pin numbers refer to the pin LM and the LM These range from a Wien bridge oscillator to intercoms and various others.

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 is a power audio amplifier for consumer. 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. The output automatically self-centers to one-half the.

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. 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. 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.


However, the performance is such that I doubt it would meet the required standards for professional use, and I have never seen an LM used in pro gear. 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. I don’t think I even need to say that this IC isn’t suitable for a subwoofer. A unique input stage allows ground referenced input signals.

Home – IC Supply – Link. The output is short-circuit proof with internal thermal limiting. The author Rod Elliott datashee 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 l,384n project.

These are allegedly available, but I couldn’t find anything even remotely similar from my normal suppliers. While you may see it rated for up to 1W output, this is a little adventurous to put it mildly.

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 om384n a sub-standard heatsink. Quiescent Output Voltage is at One Half of the. The preferred method is to make or buy copper heatsinks that can be soldered directly to the pins. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of. The bypass cap C2 is optional as well, but if datashedt don’t include it the power supply rejection is rather poor, so anything other than a battery supply may cause some hum.

The LM is also available in a pin package, which has greater dissipation and can provide more power. It would be worthwhile to give it a very light spray with matte black paint to improve radiation. They can be run without a heatsink, but only for low power output, and care is needed to ensure the IC doesn’t overheat.


5-W Audio Power Amplifier

Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright lm384nn. Of the three types, the LM is the more popular.

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. If these pins are linked by a 10uF capacitor, the gain is 46dB. The output automatically self-centers to one-half the supply voltage. The impedance at both inputs is 50k, set by internal resistors.

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 package outline is standard dual-in-line. The circuit shown is only partially optimised for best performance.

None are anything special, and they are fairly low power the LM is only rated for mW into 8 ohms. 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. However, that varies with supply voltage and load impedance so you’ll need to assess the circuit under your operating conditions.

The suggested heatsink designs are shown below. The quiescent output voltage is set internally to be half the supply voltage, and by default the gain is 20 26dB.

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. The negative input signal doesn’t get adtasheet off as you might expect, because the emitter is still positive. It should be easy enough to fabricate a suitable heatsink if you have some sheet copper available.