LM3876T/NOPB

Series:	Overture™
Packaging:	Tube
Part Status:	Obsolete
Type:	Class AB
Output Type:	1-Channel (Mono)
Max Output Power x Channels @ Load:	56W x 1 @ 8 Ohm
Voltage - Supply:	20 V ~ 84 V, ±10 V ~ 42 V
Features:	Mute, Short-Circuit and Thermal Protection
Mounting Type:	Through Hole
Operating Temperature:	-20°C ~ 85°C (TA)
Supplier Device Package:	TO-220-11
Package / Case:	TO-220-11 (Formed Leads)
Base Part Number:	LM3876

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LM3876T/NOPB Application Field and Working Principle

The LM3876T/NOPB audio power amplifier from Texas Instruments is an iconic audio chip amplifier. This amplifier offers benefits to designers and users alike. It can be used in several application fields, such as consumer audio or automotive sound system, and its operating principle is quite simple and efficient.

Applications and Benefits

The LM3876T/NOPB is an ideal choice for a wide range of consumer audio applications such as low-power audio amplifiers, subwoofer amplifiers, and headphones, as well as professional audio systems like loud speakers, studio monitors, and recording equipment. This audio amplifier is designed to bring improved sound quality and low distortion, both of which are essential for audio amplifiers. The main benefit of using this audio power amplifier is that its operating temperature range is very wide. This allows the chip to be used in a wide range of applications, even in extreme temperatures. This feature is essential for automotive applications, as it allows the amplifier to operate without overheating under the increased pressure and heat of a car’s environment. In addition, the power of the LM3876T/NOPB is also one of its selling points. It is capable of delivering up to 8W of output power at 8Ω, with only a single supply voltage of 4.5V. This makes it an ideal choice for low-power applications such as headphones and headsets.

Working Principle and Features

The LM3876T/NOPB is a class AB audio amplifier which uses a two-stage structure. The two-stage circuitry of the amplifier is what ensures its low distortion and improved sound quality. The two-stage design uses a two-stage amplifier with a Feedback Operational amplifier (FOA) that acts as a low-voltage pre-amplifier and a Class AB output amplifier. The FOA features internal gain of 11V/V and can be adjusted easily, allowing designers to adjust it for the desired output level and sound. Additionally, the amplifier features a low-noise input stage, low output impedance for improved power efficiency, and an optocoupler that provides protection from external interferences. In terms of power output, the LM3876T/NOPB is capable of delivering up to 8W of output power at 8Ω, with only a single supply voltage of 4.5V. It also comes with a wide frequency response, from 10 kHz to 200 kHz, making it suitable for most audio applications. As for protection, the LM3876T/NOPB features a number of protective features, such as an optocoupler, Under Voltage Lockout (UVLO), and a thermal protection circuit.

Conclusion

The LM3876T/NOPB audio power amplifier from Texas Instruments is an iconic audio chip amplifier that offers improved sound quality and low distortion. Its wide operating temperature range and low power requirements make it an ideal choice for both consumer audio and automotive sound system applications. Its two-stage design and features like optocoupler and thermal protection circuit provide added protection and improved functionality. The amplifier can deliver up to 8W at 8Ω, with only a single supply voltage of 4.5V, making it a great choice for low-power audio applications.

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