TIDUA71A January   2022  – November 2024

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
  8. 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
  9. 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
  10. 4Design and Documentation Support
    1. 4.1 Design Files
    2. 4.2 Support Resources
    3. 4.3 Trademarks
  11. 5About the Author
  12. 6Revision History

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.

TIDA-020033 Audio Output and Boost Voltage Without Class-H OperationFigure 3-1 Audio Output and Boost Voltage Without Class-H Operation
TIDA-020033 Audio Output and Boost Voltage With Class-H OperationFigure 3-2 Audio Output and Boost Voltage With Class-H Operation