TIDUA71 January   2022

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TAS6584-Q1
      2. 2.3.2 LM5123-Q1
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Results
      1. 3.2.1 Class-H Tracking Waveform Example
      2. 3.2.2 Thermal Performance
  9. 4Design and Documentation Support
    1. 4.1 Design Files
    2. 4.2 Support Resources
    3. 4.3 Trademarks
  10. 5About the Author

3.2.1 Class-H Tracking Waveform Example

Figure 3-1 and Figure 3-2 show examples of the output of the LM5123-Q1 with and without the envelope tracking software running in the TAS6584-Q1. When disabled, the output of the boost is set to a constant 42 V to allow for a maximum output power of about 120 W into an 8-Ω load. When enabled, the output voltage will follow the envelope of the audio waveform and can vary anywhere from 15 V to 42 V.

GUID-20211215-SS0I-BF1Q-WD7J-ZKFWQCVZDR3C-low.pngFigure 3-1 Audio Output and Boost Voltage Without Class-H Operation
GUID-20211215-SS0I-5VVF-D37X-NN7LTVD2WGHC-low.pngFigure 3-2 Audio Output and Boost Voltage With Class-H Operation