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LM4682 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4682 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 21 page  LM4682 10 Watt Stereo CLASS D Audio Power Amplifier with Stereo Headphone Amplifier and DC Volume Control General Description The LM4682 is a fully integrated single supply, high effi- ciency audio power amplifier solution. The LM4682 utilizes a proprietary balanced pulse-width modulation technique that lowers output noise and THD and improves PSRR when compared to conventional pulse width modulators. The LM4682 also features a stereo headphone amplifier that delivers 60mW into a 32 Ω headset with less than 0.5% THD. The LM4682’s DC volume control has a +30dB to –48dB range when speakers are driven and a range of +13dB to –65dB when headphones are connected. All amplifiers are protected by thermal shutdown. Additionally, all amplifiers incorporate output current limiting function to protect their outputs from short circuit. The LM4682 features a low-power consumption shutdown mode. And its efficiency reaches 85% for a 10W output power with an 8 Ω load. External heatsink is not required when playing music. The IC features click and pop reduction circuitry that minimizes audible popping during device turn-on and turn-off. The LM4682 is available in a 48-lead LLP package, ideal for portable and desktop computer ap- plications. Key Specifications n P O at THD+N = 10%, VDD = 14V 10W (typ) n THD+N at 1kHz at 6W into 8 Ω (Power Amp) 0.2% (typ) n Efficiency at 7W into 8 Ω 84% (typ) n Total quiescent power supply current 52mA (typ) n Total shutdown power supply current 0.1mA (typ) n THD+N 1kHz, 20mW, 32 Ω (Headphone) 0.02% (typ) n Single supply range 8.5V to 15V Features n Pulse-width modulator. n DC Volume Control n Stereo headphone amplifier. n “Click and pop” suppression circuitry. n Micropower shutdown mode. n 48 lead LLP package (No heatsink required). Applications n Flat Panel Displays n Televisions n Multimedia Monitors Boomer® is a registered trademark of National Semiconductor Corporation. March 2006 © 2006 National Semiconductor Corporation DS201196 www.national.com |
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