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Texas Instruments TPA3128D2/TPA3129D2 Class-D Amplifiers

Texas Instruments TPA3128D2/TPA3129D2 Class-D Amplifiers have low idle power loss. This feature helps to extend the battery life of BLUETOOTH®/Wireless speakers and other battery-powered audio systems. The high efficiency of the TPA3128D2 device allows it to do 2 × 30W without an external heat sink on a dual-layer PCB. The high efficiency of the TPA3129D2 device enables it to do 2 × 15W without an external heat sink on a dual-layer PCB. Each device includes an efficiency boost Mode, which can dynamically reduce the current ripple of the external LC filter and the idle current. The Texas Instruments TPA3128D2/TPA3129D2 advanced oscillator/PLL circuit employs a multiple switching frequency option. This option allows the device to avoid AM interferences, achieved with either a master or slave option, making it possible to synchronize multiple devices.

Features

  • Supports multiple output configurations
    • 2×30W into an 8Ω BTL load at 24V (TPA3128D2)
    • 2×15W into an 8Ω BTL load at 15V (TPA3129D2)
  • 4.5V to 26V wide voltage range 
  • Efficient Class-D operation
    • Very low idle current (< 23mA for recommended LC filter configurations)
    • Greater than 90% power efficiency combined with low idle loss dramatically eliminates the need for a heat sink
    • Adaptive modulation schemes based on output power
    • Smart amplifier drivers to reduce the requirement for RC snubbers
  • Multiple switching frequencies
    • AM avoidance
    • Master and Slave synchronization
    • 300KHz to 1.2MHz switching frequency
  • Feedback power-stage architecture with high PSRR reduces PSU requirements
  • Programmable power limit
  • Parallel BTL mode and mono-channel mode support
  • Supports both single and dual power supply modes
  • Integrated self-protection circuits including overvoltage, undervoltage, overtemperature, DC-detect, and short circuit with error reporting
  • Thermally enhanced packages
  • DAP (32-pin HTSSOP pad down for TPA3128D2 and TPA3129D2)

Applications

  • Bluetooth/wireless speakers
  • Soundbars
  • Mini-micro component, docks
  • LCD-LED TVs
  • Home theaters

Simplified Application Circuit

Application Circuit Diagram - Texas Instruments TPA3128D2/TPA3129D2 Class-D Amplifiers
Published: 2017-08-07 | Updated: 2022-06-17