Texas Instruments LM3886 Overture Manual

LM3886 Overture
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
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 4Ω at V
n 38W cont. avg. output power into 8Ω at V
n 50W cont. avg. output power into 8Ω at V

Typical Application

*Optional components dependent upon specific design requirements. Refer to the External Components Description section for a component functional
description.
Overture ™ and SPiKe ™ Protection are trademarks of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
™ Audio Power Amplifier Series
™ ) protection cir-
±
= 28V
CC
±
= 28V
CC
±
= 35V
CC
FIGURE 1. Typical Audio Amplifier Application Circuit
DS011833
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
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
01183301
October 2003
| ≤ 12V, thus
| + |V
CC
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