SLOA326 October 2022 TAS2781
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.
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 |