TPA2008D2

TPA2008D2 www.ti.com SLOS413C – JULY 2003 – REVISED MAY 2004 3-W STEREO CLASS-D AUDIO POWER AMPLIFIER WITH DC VOLUME CONTROL Efficiency − % THD+N − Total Harmonic Distortion + Noise − % FEATURES 3 W Per Channel into 3-Ω Speakers (THD+N = 10%) – < 0.045% THD at 1.5 W, 1 kHz, 3-Ω Load DC Volume Control With 2-dB Steps From -38 dB to 20 dB Filter Free Modulation Scheme Operates Without a Large and Expensive LC Output Filter Extremely Efficient Third Generation 5-V Class-D Technology – Low Supply Current, 7 mA – Low Shutdown Control, 1 µA – Low Noise Floor, -80 dBV – Maximum Efficiency into 3 Ω, 78% – Maximum Efficiency into 8 Ω, 88% – PSRR, -70 dB Integrated Depop Circuitry Operating Temperature Range, -40°C to 85°C Space-Saving, Surface Mount PowerPAD™ Package APPLICATIONS LCD Projectors LCD Monitors Powered Speakers Battery Operated and Space Constrained Systems 100 90 80 70 60 50 40 30 20 10 0 0 EFFICIENCY vs OUTPUT POWER 8 Ω Speaker 4 Ω Speaker 3 Ω Speaker VDD = 5 V No Filter 0.5 1 1.5 2 2.5 3 3.5 PO − Output Power − W DESCRIPTION The TPA2008D2 is a third generation 5-V class-D amplifier from Texas Instruments. Improvements to previous generation devices include: dc volume control, lower supply current, lower noise floor, higher efficiency, smaller packaging, and fewer external components. Most notably, a new filter-free class-D modulation technique allows the TPA2008D2 to directly drive the speakers, without needing a low-pass output filte...