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Friday, February 13, 2009

Single Supply 68W Audio Power Amplifier Circuit

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 Instantaneous
Temperature (°Ke) (SPiKe™) protection circuitry,
puts it in a class above discrete and hybrid amplifiers
by providing an inherently, dynamically protected Safe Operating
Area (SOA). SPiKe protection means that these
parts are completely safeguarded at the output against overvoltage,
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%.
- 68W cont. avg. output power into 4Ω at VCC = ±28V
- 38W cont. avg. output power into 8Ω at VCC = ±28V
- 50W cont. avg. output power into 8Ω at VCC = ±35V
- 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 VEE + VCC ≤ 12V, thus
eliminating turn-on and turn-off transients
- 11-lead TO-220 package
- Wide supply range 20V - 94V

LM3886 Datasheet Pdf

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