LM3886
Overture
™
Audio Power Amplifier Series
High-Performance 68W Audio Power Amplifier w/Mute
General Description
The LM3886 is a high-performance audio power amplifier
capable of delivering 68W of continuous average power to a
4
Ω
load and 38W into 8
Ω
with 0.1% THD+N from
20Hz–20kHz.
The performance of the LM3886, utilizing its Self Peak In-
stantaneous Temperature (˚Ke) (
SPiKe
™
) protection cir-
cuitry, puts it in a class above discrete and hybrid amplifiers
by providing an inherently, dynamically protected Safe Op-
erating Area (SOA).
SPiKe
protection means that these
parts are completely safeguarded at the output against ov-
ervoltage, undervoltage, overloads, including shorts to the
supplies, thermal runaway, and instantaneous temperature
peaks.
The LM3886 maintains an excellent signal-to-noise ratio of
greater than 92dB with a typical low noise floor of 2.0µV. It
exhibits extremely low THD+N values of 0.03% at the rated
output into the rated load over the audio spectrum, and
provides excellent linearity with an IMD (SMPTE) typical
rating of 0.004%.
Features
n
68W cont. avg. output power into 4
Ω
at V
CC
=
±
28V
n
38W cont. avg. output power into 8
Ω
at V
CC
=
±
28V
n
50W cont. avg. output power into 8
Ω
at V
CC
=
±
35V
n
135W instantaneous peak output power capability
n
Signal-to-Noise Ratio
≥
92dB
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
EE
| + |V
CC
|
≤
12V, thus
eliminating turn-on and turn-off transients
n
11-lead TO-220 package
n
Wide supply range 20V - 94V
Applications
n
Component stereo
n
Compact stereo
n
Self-powered speakers
n
Surround-sound amplifiers
n
High-end stereo TVs
Typical Application
Overture
™
and
SPiKe
™
Protection are trademarks of National Semiconductor Corporation.
01183301
*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
October 2003
LM3886
Overture
Audio
Power
Amplifier
Series
High-Performance
68W
Audio
Power
Amplifier
w/Mute
© 2003 National Semiconductor Corporation
DS011833
www.national.com