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 VRMS 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.