TPA3221 Class-D Amplifier

Texas Instruments' TPA3221 is a 100 W stereo and 200 W mono HD analog-input Class-D amplifier

Image of Texas Instruments' TPA3221 Class-D AmplifierTexas 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.

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

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
TPA3221DDV datasheet linkHIGH POWER AMPLIFIERTPA3221DDVHIGH POWER AMPLIFIER0TPA3221DDV product page link
TPA3221DDVR datasheet linkTPA3221DDVRTPA3221DDVRTPA3221DDVR0TPA3221DDVR product page link
Published: 2018-02-01