LM4781

LM4781 Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute August 2003 LM4781 Overture™ Audio Power Amplifier Series 3 Channel 35W Audio Power Amplifier with Mute General Description The LM4781 is a three channel audio amplifier capable of typically delivering 35W per channel of continuous average output power into an 8Ω load with less than 0.5% THD+N from 20Hz - 20kHz. The LM4781 is fully protected utilizing National’s Self Peak Instantaneous Temperature (˚Ke) (SPiKeTM) protection circuitry. SPiKe provides a dynamically optimized Safe Operating Area (SOA). SPiKe protection completely safeguards the LM4781’s outputs against over-voltage, under-voltage, overloads, shorts to the supplies or GND, thermal runaway and instantaneous temperature peaks. The advanced protection features of the LM4781 places it in a class above discrete and hybrid amplifiers. Each amplifier of the LM4781 has an independent smooth transition fade-in/out mute. The LM4781 can easily be configured for bridge or parallel operation for higher power and bi-amp solutions. Key Specifications j Output Power/Channel with 0.5% THD+N, 1kHz into 8Ω 35W (typ) j THD+N at 3 x 20W into 8Ω (20Hz - 20kHz) 0.2% (typ) j THD+N at 3 x 20W into 6Ω (20Hz - 20kHz) 0.3% (typ) j THD+N at 3 x 20W into 4Ω (20Hz - 20kHz) 0.5% (typ) j Mute Attenuation j PSRR j Slew Rate 110dB (typ) 85dB (min) 9V/µs (typ) Features n n n n n SPiKe Protection Low external component count Quiet fade-in/out mute mod...