TPA3223 Mono HD Analog-Input, Class-D Amplifier Texas Instruments TPA3223 Mono HD Analog-Input, Class-D Amplifier provides an efficient operation at full power, idle, and standby. The TPA3223 has closed-loop feedback allowing low distortion across the audio band and delivering excellent sound quality. The TPA3223 operates in AD modulation and drives up to 2 x 200W into 4Ω load or 1 x 400W into 2Ω load.