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LM4781 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4781 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 25 page  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 8 Ω load with less than 0.5% THD+N from 20Hz - 20kHz. The LM4781 is fully protected utilizing National’s Self Peak Instantaneous Temperature (˚Ke) (SPiKe TM) protection cir- cuitry. SPiKe provides a dynamically optimized Safe Operat- ing Area (SOA). SPiKe protection completely safeguards the LM4781’s outputs against over-voltage, under-voltage, over- loads, 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 8 Ω 35W (typ) j THD+N at 3 x 20W into 8 Ω (20Hz - 20kHz) 0.2% (typ) j THD+N at 3 x 20W into 6 Ω (20Hz - 20kHz) 0.3% (typ) j THD+N at 3 x 20W into 4 Ω (20Hz - 20kHz) 0.5% (typ) j Mute Attenuation 110dB (typ) j PSRR 85dB (min) j Slew Rate 9V/µs (typ) Features n SPiKe Protection n Low external component count n Quiet fade-in/out mute mode n Wide supply range: 20V - 70V n Signal-to-Noise Ratio ≥ 93dB (ref. to P O = 1W) Applications n Audio amplifier for component stereo n Audio amplifier for compact stereo n Audio amplifier for self-powered speakers n Audio amplifier for high-end and HD TVs Typical Application SPiKe™ Protection and Overture™ are trademarks of National Semiconductor Corporation. 200673B5 FIGURE 1. Typical Audio Amplifier Application Circuit August 2003 © 2003 National Semiconductor Corporation DS200673 www.national.com |
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