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 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.
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- 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
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- 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
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| Applications |
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- Wireless and powered speakers
- Soundbars
- Subwoofers
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- Bookshelf stereo systems
- Professional and public address (PA) speakers
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