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TI Class D audio amps have high efficiency

Posted: 14 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:texas instruments? tps3000d? tps3002ds? tpa3001d1? class d amplifier?

The TPA3000D family of Class D audio amplifiers from Texas Instruments Inc. exhibits 250kHz PWM operation and low output FET on-resistance, enabling it to achieve an efficiency of up to 85 percent.

The high efficiency pf the amplifier allows it to drive up to 20W of continuous output power and reduces the heat in the system, eliminating the need for large heatsinks and through-hole packaging. This also helps in reducing the board space and component costs for manufacturers.

The amplifiers were initially designed for use in flat panel displays, but have since found applications in automobile audio systems.

Devices in the family include the TPA3002D2 9W stereo amplifier with dc volume control and pre-outs for headphone drive, and the TPA3001D1 20W mono audio power amplifier. Both operate from a 12V supply and exhibit <1 percent THD+N at half the rated output power level. A-weighted noise floor is 86?Vrms or -81dB across the entire audio frequency band.

The TPA3001D1 comes in a standard PowerPAD surface mount 24-pin TSSOP, while the TPA3003D2 comes in 48-pin QFPs.

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