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. 3.3.1.1 PWM Steps
        2. 3.3.1.2 Lookahead Time
        3. 3.3.1.3 Margin
        4. 3.3.1.4 Inflation Factor
      2. 3.3.2 Battery Life
      3. 3.3.3 Thermal Performance
  6. 4References

3.3.2 Battery Life

Figure 3-13 shows the battery life measured using a system comprised of the TAS2781 audio amplifier and the TPS61089 boost converter. The boost input is powered using a battery and boost output powers the PVDDH rail of the TAS2781 such that the voltage can vary between 5 V to 12 V. For this test, a music track is played on a loop and the battery voltage is recorded. Battery life is measured for class-H and class-G operation in PWR_MODE0 of the TAS2781 (Y-Bridge is disabled). In absence of an external boost controller, the Y-Bridge algorithm can be used to improve efficiency and battery life. Refer to the Power Supply Modes section of the TAS278x data sheet for details. In class-H as well as class-G, the PVDDH supply of TAS278x tracks the audio stream. In the use case of no control operation, the TAS278x operates on constant PVDDH supply.

Table 3-4 Battery Life Test Conditions
Test Condition Description
Battery 4.5 V, 1500 mAh fully-charged
(common AA batteries in 3S configuration)
AVDD and IOVDD Power Supply 1.8 V
PVDDL Power Supply 5 V
Power Supply Mode PWR_MODE0
Refer to the Power Supply Modes section of TAS278x data sheet for details
Speaker Load 8 Ω + 15 µH
Music Track Famous Artist- Popular Song

Figure 3-13 Battery Life: Class-H, Class-G, and No Control