LM2876

High-Performance 40W Audio Power Amplifier w/Mute

General Description

The LM2876 is a high-performance audio power amplifier

capable of delivering 40W of continuous average power to

an 8

Ω load with 0.1% (THD + N) from 20 Hz–20 kHz.

The performance of the LM2876, utilizing its Self Peak In-

cuitry, puts it in a class above discrete and hybrid amplifiers

by providing an inherently, dynamically protected Safe Oper-

ating Area (SOA). SPiKe Protection means that these parts

are completely safeguarded at the output against overvolt-

age, undervoltage, overloads, including shorts to the sup-

plies, thermal runaway, and instantaneous temperature

peaks.

The LM2876 maintains an excellent Signal-to-Noise Ratio of

greater than 95 dB(min) with a typical low noise floor of

2.0 µV. It exhibits extremely low (THD + N) values of 0.06%

at the rated output into the rated load over the audio spec-

trum, and provides excellent linearity with an IMD (SMPTE)

typical rating of 0.004%.

Features

n 40W continuous average output power into 8

Ω

n 75W instantaneous peak output power capability

n Signal-to-Noise Ratio

≥ 95 dB(min)

n An input mute function

n Output protection from a short to ground or to the

supplies via internal current limiting circuitry

n Output over-voltage protection against transients from

inductive loads

n Supply under-voltage protection, not allowing internal

biasing to occur when |V

eliminating turn-on and turn-off transients

n 11-lead TO-220 package

Applications

n Component stereo

n Compact stereo

n Self-powered speakers

n Surround-sound amplifiers

n High-end stereo TVs

Typical Application

DS011775-1

* Optional components dependent upon specific design requirements. Refer to the External Components Description section for a component functional

description.

FIGURE 1. Typical Audio Amplifier Application Circuit

August 1995

© 1999 National Semiconductor Corporation

DS011775

www.national.com