Monday, March 25, 2013

Dual 20 Watt Audio Power Amplifier

Overture Audio Power Amplifier Series Dual 20-Watt Audio Power Amplifier with Mute and Standby Modes

The LM1876 is a stereo audio amplifier capable of delivering typically 20W per channel of continuous average output power into a 4 or 8 load with less than 0.1% THD+N.

Each amplifier has an independent smooth transition fade-in/out mute and a power conserving standby mode which can be controlled by external logic.

The performance of the LM1876, utilizing its Self Peak Instantaneous Temperature (°Ke) (SPiKe™) protection circuitry, places 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 safeguarded at the output against overvoltage, undervoltage, overloads, including thermal runaway and instantaneous temperature peaks.

Circuit Diagram

Dual 20-Watt Audio Power Amplifier Dual 20-Watt Audio Power Amplifier Circuit Diagram

Key Specification
THD+N at 1kHz at 2 x 15W continuous average
output power into 4 or 8: 0.1% (max)
THD+N at 1kHz at continuous average
output power of 2 x 20W into 8: 0.009% (typ)
Standby current: 4.2mA (typ)


  • High-end stereo TVs
  • Component stereo
  • Compact stereo


  • SPiKe protection
  • Minimal amount of external components necessary
  • Quiet fade-in/out mute mode
  • Standby-mode
  • Isolated 15-lead TO-220 package
  • Non-Isolated 15-lead TO-220 package
  • Wide supply range 20V - 64V

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