Texas Instruments TPA3221 100W Stereo/200W Mono Class-D Amplifiers
Texas Instruments TPA3221 100W Stereo/200W Mono HD Analog-Input Class-D Amplifiers have three operating modes, standby, idle and full-power, which enables efficient operation. Providing low distortion across the audio band, the closed-loop feedback has a bandwidth up to 100kHz, delivering excellent sound quality. Other high-efficiency features are an output power of up to 2 x 105W into 4Ω load or 1 x 208W into 2Ω load and operating within either AD or low idle-current HEAD (High Efficient AD mode) modulation.
Due to the single-ended or differential analog-input interface, the device supports four selectable gains of 18dB, 24dB, 30dB, and 34dB. The TPA3221 additionally delivers >90% efficiency, low idle power (<0.25W), and ultra-low standby power (<0.1W). This is made possible using 70mΩ MOSFETs, an optimized gate drive scheme, and low-power operating modes.
The TPA3221 simplifies the design by including a built-in LDO for easy integration in single-power-supply systems and integrating essential protection features. These features include undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, over-temperature warning, and shutdown, as well as DC speaker protection.
Features
- Wide 7V to 30V supply voltage operation
- Stereo (2 x BTL) and mono (1 x PBTL) operation
- Output power at 10% THD+N
- 105W Stereo into 4Ω in BTL configuration
- 112W Stereo into 3Ω in BTL configuration
- 208W Mono into 2Ω in PBTL configuration
- Output power at 1% THD+N
- 88W Stereo into 4Ω in BTL configuration
- 100W Stereo into 3Ω in BTL configuration
- 170W Mono into 2Ω in PBTL configuration
- 5V Gate drive or built-in LDO for optional single-supply operation
- Integrated protection: undervoltage, overvoltage, cycle-by-cycle current limit, short circuit, clipping detection, over-temperature warning and shutdown, and DC speaker protection
- 90% Efficient class-D operation (4Ω)
- Closed-loop feedback design
- Signal bandwidth up to 100kHz for high-frequency content from HD sources
- 0.02% THD+N at 1W into 4Ω
- 60dB PSRR (BTL, No input signal)
- <75µV Output noise (A-weighted)
- >108dB SNR (A-weighted)
- AD or HEAD Modulation schemes
- Low-power operating modes
- Standby modes: mute and <1mA 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
- 18dB, 24dB, 30dB, 34dB Selectable gains
- Pin-compatible family of devices with voltage and power-level options
Simplified Schematic
Paskelbta: 2017-12-07
| Atnaujinta: 2022-07-15