LM4731

LM4731 Stereo 25W Audio Power Amplifier with Mute and Standby Modes July 2003 LM4731 Stereo 25W Audio Power Amplifier with Mute and Standby Modes General 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 - 20kHz. 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 1kHz with 2 x 1W into 8Ω j Mute Attenuation j PSRR with fRIPPLE = 120Hz, 25W (typ) 0.02% (typ) 85dB (typ) 50dB (typ) 18V/µs (typ) 4.8mA (typ) VRIPPLE = 1VRMS j Slew Rate j Standby Current (+/-22V) Features n Minimal amount of external components 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 component stereo compact stereo PC satellite speaker systems self powered speakers Connection Diagrams Plastic Pa...