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Audio power amplifiers for digital TVs boast efficiency

Dallas — Texas Instruments Inc.'s stereo, Class-D, audio power amplifiers are said to feature an easy-to-use layout and low electromagnetic interference to speed the design cycle of medium- and large-screen digital televisions.

The TPA3100D2 stereo amplifier drives up to 20 watts per channel of continuous stereo output power with no external heat sink and is typically used in 27-inch and larger DTVs. The TPA3101D2 is a pin-for-pin version with 10 W per channel output power that targets DTVs smaller than 27 inches. Both devices can drive a nominal load down to 4 ohms.

TI's TPA3100D2 is 92 percent efficient when driving 8-ohm speakers, eliminating the need for an external heat sink, the company said. The TPA310xD2 devices feature wide supply voltage operation from 10 volts to 26 V, simplifying power supply requirements and making operation from the LCD backlight voltage possible. Thermal and short circuit protection with an auto recovery option ensures reliability and robust operation, the company said.

TI's amplifiers are pin-for-pin compatible, allowing TV designers using the TPA3101D2 to upgrade their systems to the 20-W output power of the TPA3100D2. In addition, reference layouts have been tested and passed the EMI requirements of Federal Communications Commission (FCC) Part 15 Class B and Conformité Européenne (CE) CISPR 22 regulations.

TI's TPA3100DS and TPA3101D2 amplifiers also feature pop and click-minimizing circuitry, low total harmonic distortion and excellent signal-to-noise ratio, said Gary Reichmuth, manager of TI's analog audio power amplifiers.

Samples and EVMs are available for 24-hour delivery. The TPA3100D2 and TPA3101D2 Class-D audio power amplifiers are available now in a 7 x 7-mm, 48-pin QFN package. The device will also be available soon in a 48-pin TQFP. Suggested resale pricing in quantities of 1,000 is $3.50 for the TPA3100D2 and $3.10 for the TPA3101D2. Click here for the TPA3100D2 data sheet. Click here for the TPA3101D2 data sheet.

Texas Instruments Inc. , 1-800-262-5643, www.TI.com.

Click here for a wealth of digital TV-related information at the Digital TV DesignLine.

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