TIDUFC9 May   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Codec Design
      2. 2.2.2 Class-D Amplifier
        1. 2.2.2.1 Audio Filter Design
      3. 2.2.3 Power Design
      4. 2.2.4 EMC, EMI Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 TAC5312-Q1
      2. 2.3.2 TAS5441-Q1
      3. 2.3.3 LMR43620-Q1
      4. 2.3.4 TPS7A52-Q1
      5. 2.3.5 TPD2E007
  9. 3Hardware, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Board Connection
      2. 3.1.2 Configuring the Board
    2. 3.2 Software Requirements
      1. 3.2.1 Firmware for Bench Tests
    3. 3.3 Test Setup
    4. 3.4 Test Results
      1. 3.4.1 Audio Performance
      2. 3.4.2 Power Tests
      3. 3.4.3 EMI, EMC Test Results
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 Bill of Materials
      3. 4.1.3 PCB Layout Recommendations
        1. 4.1.3.1 Layout Prints
      4. 4.1.4 Altium Project
      5. 4.1.5 Gerber Files
      6. 4.1.6 Assembly Drawings
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author

3.4.2 Power Tests

Class-D amplifiers are designed for efficiency at higher output powers. The switching losses and device current consumption remain about the same regardless of output power which results in low efficiency at low output power and higher efficiency as the output power increases. Figure 3-5 shows the efficiency versus output power for the TIDA-060048.

TIDA-060048 Efficiency versus Output Power, 4Ω Load, PVDD = 14.4VFigure 3-5 Efficiency versus Output Power, 4Ω Load, PVDD = 14.4V

At lower-input voltage levels, the output signal can clip at higher output powers. This affects the THD+N. Figure 3-6 shows the maximum output power versus the input voltage to achieve 1% or 10% THD+N. At over 10V, 8W of output power is achievable at less than 1% THD+N.

TIDA-060048 Maximum Output Power versus Input Voltage, 4Ω LoadFigure 3-6 Maximum Output Power versus Input Voltage, 4Ω Load