LM4731 Datasheet | National Semiconductor

Description The LM4731 is a stereo audio amplifier capable of delivering typically 25W per channel of continuous average output power into a 4Ω or 8Ω load with less than 10% THD+N from 20Hz - 20k Hz. Each amplifier has an independent smooth transition fadein/out mute and a power conserving standby mode which can be controlled by external logic. The LM4731 has short circuit protection and a thermal shut down feature that is activated when the die temperature exceeds 150˚C. The LM4731 also has a under voltage lock out feature for click and pop free power off and on. The LM4731 has a wide operating supply range from +/-10V - +/-28V allowing for lower cost unregulated power supplies to be used. Key Specifications j Output Power into 4Ω or 8Ω, 10% THD+N j THD+N at 1k Hz with 2 x 1W into 8Ω j Mute Attenuation j PSRR with f RIPPLE = 120Hz, 25W (typ) 0.02% (typ) 85d B (typ) 50d B (typ) 18V/µs (typ) 4.8m A (typ) VRIPPLE = 1VRMS j Slew Rate j Standby Current (+/-22V) Features n Minimal amount of external ponents necessary n Quiet fade-in/out mute mode n Low current Standby-mode Applications n n n n n Audio Audio Audio Audio Audio amplifier amplifier amplifier amplifier amplifier for for for for for high-end stereo TVs ponent stereo pact stereo PC satellite speaker systems self powered speakers Connection Diagrams Plastic Package TO-220 Top Marking (Note 12) Top View Non-Isolated Package Order Number LM4731TA See NS Package Number TA15A Top View U - Wafer Fab Code Z - Assembly Plant Code XY - Date Code TT - Die Traceability LM4731TA - LM4731TA © 2003 National Semiconductor Corporation DS200603 .national. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit .national. Absolute Maximum Ratings 2) (Notes 1, Soldering Information T Package (10 sec.) Storage Temperature Thermal Resistance θJA (TA) θJC (TA) 43˚C/W 1.5˚C/W 260˚C - 40˚C to +150˚C If Military/Aerospace specified devices are required,...