LM3886
Overture
Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier
w/Mute
October 2003
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
4Ω load and 38W into 8Ω 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%.
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135W instantaneous peak output power capability
Signal-to-Noise Ratio
≥
92dB
An input mute function
Output protection from a short to ground or to the
supplies via internal current limiting circuitry
Output over-voltage protection against transients from
inductive loads
Supply under-voltage protection, not allowing internal
biasing to occur when |V
EE
| + |V
CC
|
≤
12V, thus
eliminating turn-on and turn-off transients
11-lead TO-220 package
Wide supply range 20V - 94V
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Applications
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Component stereo
Compact stereo
Self-powered speakers
Surround-sound amplifiers
High-end stereo TVs
Features
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68W cont. avg. output power into 4Ω at V
CC
=
±
28V
n
38W cont. avg. output power into 8Ω at V
CC
=
±
28V
n
50W cont. avg. output power into 8Ω at V
CC
=
±
35V
Typical Application
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
Overture
™
and
SPiKe
™
Protection are trademarks of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS011833
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
