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LM4731

National Semiconductor
Part Number LM4731
Manufacturer National Semiconductor
Description Stereo 25W Audio Power Amplifier
Published Mar 22, 2005
Detailed Description LM4731 Stereo 25W Audio Power Amplifier with Mute and Standby Modes July 2003 LM4731 Stereo 25W Audio Power Amplifier ...
Datasheet PDF File LM4731 PDF File

LM4731
LM4731

Overview
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 Package TO-220 Top Marking (Note 12) 20060375 20060352 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 www.
national.
com LM4731 Typical Application 20060353 FIGURE 1.
Typical Audio Amplifier Application Circuit www.
national.
com 2 LM4731 Absolute Maximum Ratings 2) (Notes 1, Soldering Informati...


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