Texas Instruments' TPA3221 is a high-power Class-D amplifier that enables efficient operation at full-power, idle, and standby. The device features closed-loop feedback with a bandwidth up to 100 kHz, which provides low distortion across the audio band and delivers excellent sound quality. The device operates with either AD or low idle-current HEAD (high efficient AD mode) modulation, and can drive up to 2 x 105 W into 4 Ω load or 1 x 208 W into 2 Ω load.

The TPA3221 features a single-ended or differential analog-input interface that supports up to 2 V_RMS with four selectable gains: 18 dB, 24 dB, 30 dB, and 34 dB. The TPA3221 also achieves >90% efficiency, low idle power (<0.25 W) and ultra-low standby power (<0.1 W). This is made possible through the use of 70 mΩ MOSFETs, an optimized gate drive scheme and low-power operating modes. TPA3221 includes a built-in LDO for easy integration in single-power-supply systems. To further simplify the design, the device integrates essential protection features including undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, overtemperature warning and shutdown, as well as DC speaker protection.

Features
Wide 7 V to 30 V supply voltage operation Stereo (2 x BTL) and mono (1 x PBTL) operation Output power at 10% THD+N 105 W stereo into 4 Ω in BTL configuration 112 W stereo into 3 Ω in BTL configuration 208 W mono into 2 Ω in PBTL configuration Output power at 1% THD+N 88 W stereo into 4 Ω in BTL configuration 100 W stereo into 3 Ω in BTL configuration 170 W mono into 2 Ω in PBTL configuration 5 V gate drive or built-in LDO for optional single-supply operation Integrated protection: undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, overtemperature warning and shutdown, and DC speaker protection 90% efficient Class-D operation (4 Ω) Pin-compatible family of devices with voltage and power-level options		Closed-loop feedback design Signal bandwidth up to 100 kHz for high-frequency content from HD sources 0.02% THD+N at 1 W into 4 Ω 60 dB PSRR (BTL, no input signal) <75 µV output noise (A-weighted) >108 dB SNR (A-weighted) AD or HEAD modulation schemes Low-power operating modes Standby modes: mute and <1 mA shutdown Low idle-current HEAD modulation scheme Single-channel BTL operation Multiple input options to simplify pre-amp design Differential or single-ended analog inputs Selectable gains: 18 dB, 24 dB, 30 dB, 34 dB
Applications
Wireless and powered speakers Soundbars Subwoofers		Bookshelf stereo systems Professional and public address (PA) speakers

TPA3221 Class-D Amplifier

	Image	Manufacturer Part Number	Description		View Details
		TPA3221DDV	HIGH POWER AMPLIFIER
		TPA3221DDVR	TPA3221DDVR

Evaluation Board

	Image	Manufacturer Part Number	Description		View Details
		TPA3221EVM	EVAL BOARD FOR TPA3221