SLAAEU7 February   2025 TAS5805M

 

  1.   1
  2.   Abstract
  3. 1Power Architecture of a Class-D Digital Audio Amplifier and Its Loss Breakdown
  4. 2Improving Audio Amplifier Efficiency with Class-H Mode
    1. 2.1 How Class-H Mode Improves Efficiency
    2. 2.2 TI's Digital Class-H Innovation
  5. 3Improving Efficiency With External GVDD and AVDD and Considerations
    1. 3.1 Testing Power Saving from External GVDD and AVDD and Testing the Impact on Audio Metrics
    2. 3.2 Considerations for External GVDD and AVDD:
      1. 3.2.1 Voltage Range of External GVDD and AVDD:
      2. 3.2.2 Sequence Requirements for External GVDD and AVDD:
  6. 4Summary
  7. 5References

3 Improving Efficiency With External GVDD and AVDD and Considerations

The internal power architecture of the TAS5825P is shown in Figure 3-1 below. GVDD and AVDD are 5V power rails that supply the audio amplifier's internal analog and drive circuitry. They are derived from PVDD after an LDO step-down. When the PVDD voltage is high (for example, PVDD = 26V), a simple calculation shows that the efficiency of this supply is low to about 19.2%.

TAS5825P Internal Power ArchitectureFigure 3-1 TAS5825P Internal Power Architecture

So, if an external high-efficiency DC/DC converter is used to supply GVDD and AVDD, there will be a significant increase in efficiency and a reduction in the audio amplifier's power consumption. TI's TAS5825, TAS5827, TAS5828, and TAS5830 audio amplifiers all support the option of external GVDD and AVDD.