LM4766

Audio Power Amplifier Series Dual 40W Audio Power

Amplifier with Mute

General Description

The LM4766 is a stereo audio amplifier capable of delivering

typically 40W per channel of continuous average output

power into an 8

Ω load with less than 0.1% (THD + N).

The performance of the LM4766, utilizing its Self Peak In-

cuitry, places it in a class above discrete and hybrid amplifi-

ers by providing an inherently, dynamically protected Safe

Operating Area (SOA). SPiKe Protection means that these

parts are safeguarded at the output against overvoltage, un-

dervoltage, overloads, including thermal runaway and in-

stantaneous temperature peaks.

Each amplifier within the LM4766 has an independent

smooth transition fade-in/out mute that minimizes output

pops. The IC’s extremely low noise floor at 2 µV and its ex-

tremely low THD + N value of 0.06% at the rated power

make the LM4766 optimum for high-end stereo TVs or mini-

component systems.

Key Specifications

output power into 8

Ω:

0.1% (max)

output power of 2 x 30W into 8

Ω:

0.009% (typ)

Features

n SPiKe Protection

n Minimal amount of external components necessary

n Quiet fade-in/out mute mode

n Non-Isolated 15-lead TO-220 package

Applications

n High-end stereo TVs

n Component stereo

n Compact stereo

Typical Application

Note: Numbers in parentheses represent pinout for amplifier B.

Connection Diagram

DS100928-1

FIGURE 1. Typical Audio Amplifier Application Circuit

Plastic Package

DS100928-2

Top View

Non-Isolated Package

Order Number LM4766T

See NS Package Number TA15A

September 1998

© 1999 National Semiconductor Corporation

DS100928

www.national.com