SLOA326 October   2022 TAS2781


  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Hybrid-Pro Boost Controller
  5. 3Hardware, Software, and Test Results
    1. 3.1 Hardware Connections
      1. 3.1.1 Schematic Connections
      2. 3.1.2 Equations
    2. 3.2 Software Settings
      1. 3.2.1 Steps To Enable Class-H Using PPC3
      2. 3.2.2 Class-H Configuration Settings
    3. 3.3 Hybrid-Pro Feature Performance Results
      1. 3.3.1 Class-H Operation
        1. PWM Steps
        2. Lookahead Time
        3. Margin
        4. Inflation Factor
      2. 3.3.2 Battery Life
      3. 3.3.3 Thermal Performance
  6. 4References


The TAS2781 and TAS2783 devices are mono, digital input class-D audio amplifiers optimized for efficiently driving high peak power into small loudspeakers with integrated voltage and current sense. An on-chip digital-signal processor (DSP) supports Texas Instruments' SmartAmp speaker protection algorithm. The TAS2781 operates using time division multiplex (TDM), I2S, and I2C (or serial peripheral interface (SPI)) interfaces. The TAS2783 provides a flexible SoundWire 1.2 compatible peripheral interface for control and data, an I2C peripheral interface, and an I2S interface for digital audio data communication. The TAS2781 and TAS2783 have an extensive set of features that include the following:

  • Integrated DSP for audio processing
  • 23-V supply for class-D output stage
  • Y-bridge multilevel supply architecture
  • Hybrid-Pro external boost control algorithm
  • Ultrasonic output support up to 40 kHz

This document provides guidelines for using the Hybrid-Pro feature in the TAS2781 and TAS2783 by giving an overview of the internal algorithm, external interface architecture, PurePath™ Console 3 (PPC3) software, and performance results. The high-efficiency class-D operation with Hybrid-Pro provides approximately 50% longer battery life, essential for portable speaker applications, compared to fixed-supply voltage designs.