LM4781 Datasheet | National Semiconductor

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 - 20k Hz. The LM4781 is fully protected utilizing National’s Self Peak Instantaneous Temperature (˚Ke) (SPi Ke TM) protection circuitry. SPi Ke provides a dynamically optimized Safe Operating Area (SOA). SPi Ke protection pletely 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, 1k Hz into 8Ω 35W (typ) j THD+N at 3 x 20W into 8Ω (20Hz - 20k Hz) 0.2% (typ) j THD+N at 3 x 20W into 6Ω (20Hz - 20k Hz) 0.3% (typ) j THD+N at 3 x 20W into 4Ω (20Hz - 20k Hz) 0.5% (typ) j Mute Attenuation j PSRR j Slew Rate 110d B (typ) 85d B (min) 9V/µs (typ) Features n n n n n SPi Ke Protection Low external ponent count Quiet fade-in/out mute mode Wide supply range: 20V - 70V Signal-to-Noise Ratio ≥ 93d B (ref. to PO = 1W) Applications n n n n Audio Audio Audio Audio amplifier amplifier amplifier amplifier for for for for ponent stereo pact stereo self-powered speakers high-end and HD TVs Typical Application 200673B5 FIGURE 1. Typical Audio Amplifier Application Circuit SPi Ke™ Protection and Overture™ are trademarks of National Semiconductor Corporation. © 2003 National Semiconductor Corporation DS200673 .national. Connection Diagrams Plastic Package (Note 14) 200673B2 Top View Order Number LM4781TA See NS Package Number TA27A TO-220 Top Marking 200673A6 Top View U - Wafer Fab Code Z - Assembly Plant Code XY - Date Code TT...