LM3886
Overture
Audio Power Amplifier Series High-Performance 68W Audio Power Amplifier
w/Mute
May 1999
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
20 Hz–20 kHz.
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 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 LM3886 maintains an excellent Signal-to-Noise Ratio of
greater than 92 dB with a typical low noise floor of 2.0 µV. 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 rat-
ing of 0.004%.
38W cont. avg. output power into 8Ω at V
CC
=
±
28V
50W cont. avg. output power into 8Ω at V
CC
=
±
35V
135W instantaneous peak output power capability
Signal-to-Noise Ratio
≥
92 dB
An input mute function
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
n
n
n
n
n
Applications
n
n
n
n
n
Component stereo
Compact stereo
Self-powered speakers
Surround-sound amplifiers
High-end stereo TVs
Features
n
68W cont. avg. output power into 4Ω at V
CC
=
±
28V
Typical Application
DS011833-1
*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
Overture
™
and
SPiKe
™
Protection are trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS011833
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
