LM4766 Overture
™
Audio Power Amplifier Series
Dual 40W Audio Power Amplifier with Mute
September 1998
LM4766
Overture
™
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 8Ω load with less than 0.1% (THD + N).
The performance of the LM4766, utilizing its Self Peak In-
stantaneous Temperature (˚Ke) (SPiKe
™
) Protection Cir-
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
j
j
THD+N at 1 kHz at 2 x 30W continuous average
output power into 8Ω:
THD+N at 1 kHz at continuous average
output power of 2 x 30W into 8Ω:
0.009% (typ)
0.1% (max)
Features
n
n
n
n
SPiKe Protection
Minimal amount of external components necessary
Quiet fade-in/out mute mode
Non-Isolated 15-lead TO-220 package
Applications
n
High-end stereo TVs
n
Component stereo
n
Compact stereo
Typical Application
Connection Diagram
Plastic Package
DS100928-2
Top View
Non-Isolated Package
Order Number LM4766T
See NS Package Number TA15A
DS100928-1
FIGURE 1. Typical Audio Amplifier Application Circuit
Note:
Numbers in parentheses represent pinout for amplifier B.
*
Optional component dependent upon specific design requirements.
SPiKe
™
Protection and
Overture
™
are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS100928
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
