TAS2780 Digital Input Mono Class-D Audio Amplifier Texas Instruments TAS2780 Digital Input Mono Class-D Audio Amplifier is optimized to drive high peak power into small loudspeakers efficiently. The Class-D amplifier delivers 25W of continuous power into a 4Ω load with less than 1% THD+N at a supply voltage of 18V. The device's broad voltage input range and high output power are ideal for battery or line-powered systems.