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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LM from Texas Instruments

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 dxtasheet handle safely. Products conform to specifications per the terms of the Texas Instruments standard warranty.

Input stage distortion will not occur until the input signal peak exceeds mV or so, and that’s far more than necessary given the gain of the IC. The output is short-circuit proof with internal thermal limiting. The output automatically self-centers to one-half the. If you do omit C1, you will almost certainly hear some ‘scratching’ noises from the pot as it’s rotated because there’s a small DC offset at the inputs. The dtaasheet 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 While it looks very similar to the LM circuit shown above, note that the pin numbers are different.

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, See SNAA for circuit details.

I don’t think I even need to say that this IC isn’t suitable for a subwoofer. The suggested heatsink designs are shown below. You can use either input for the signal, and simply ground the unused input.


Reproduction or re-publication by any means whatsoever, whether electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws. A unique input stage allows ground referenced input signals. There’s no doubt that a small amp with similar performance can be made using an opamp and a dattasheet 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 circuit shown is datashfet partially optimised for best performance.

datasjeet The datasheeg useful voltage is around 6V, and 12V is the maximum suggested for the LM Production processing does not necessarily include testing of all parameters. The gain can be changed by adding lm348n capacitor between pins 1 and 8.

The only thing that even approaches being critical is the bypass cap. The 8-pin version is shown first. In order to ln384n system cost to a. They can be run without a heatsink, but only for low power output, and care is needed to ensure the IC doesn’t overheat. Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

These provide quite a bit of info, and lots of application circuits. 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. This makes the device easy to use in standard p-c layout.

These range from a Wien bridge oscillator to intercoms and various others. Distortion is acceptable at around 0.

Figure 1 – LM Amplifier Schematic. Construction of any of these amps is non-critical, and Veroboard or similar is the way that most people would build one.

LM386, LM380 & LM384 Power Amplifiers

A copper lead frame is used with the center three pins on either side comprising a heat sink. 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.


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 most interesting thing to look at is the input stages. The tabs solder to the IC pins, and the underside of the heatsink should be coated with heatsink compound to increase the thermal conductivity. The LM is similar, but uses 50k resistors at the inputs, and has two series resistors ohms and 1.

5-W Audio Power Amplifier

The circuit is shown for reference only, and is adapted from the datasheet but has been redrawn. 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. If these pins are linked by a 10uF capacitor, the gain is 46dB. The LM is available in two packages – 8-pin and pin.

The power supply can be anything you have handy, including a battery. While you may see it rated for up to 1W output, this is a little adventurous to put it mildly.

None are anything special, and they are fairly low power the LM is only rated for mW into 8 ohms. All pin numbers refer to the pin LM and the LM Quiescent Output Voltage is at One Daatasheet of the. 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.

Add a resistor and capacitor in series between pins 1 and 8 for intermediate gains. Every so often, you’ll find a need for a low power amplifier.