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Envelope tracking power supply reference design for audio power amplifiers

PMP15036

Overview

This envelope tracking power supply reference design helps extend battery life in portable audio applications such as Bluetooth® or Wi-Fi speakers. The low-power buck converter in this design features envelope tracking for audio power amplifiers, maintaining high efficiency over the output voltage range. By adding an audio envelope signal to the FB pin of TI's TPS61178 device, the output voltage can change according to the envelope of the audio signal, thereby dynamically adapting to the power supply of the TPA3128D2 power amplifier and optimizing its power consumption.

characteristic

● Input voltage range 5.4V to 8.4V
● When the input voltage is 7.2V, it provides 2X20W power to an 8Ω load.
● Programmable power limit
● Isolate the input battery from the output side during shutdown
● High efficiency, small solution size

Backlog Impt notice changes Backlog Impt notice changes end

Blockdiagram

Design Files

Documentation

PMP15036 Test Results

Related Devices

Devices	Class	introduce	Datasheet
OPA4377	semiconductor;Analog mixed-signal IC	OPA4377 Low-Cost, Low Noise, 5.5MHz CMOS Operational Amplifier	Download
TPA3128D2	semiconductor;Analog mixed-signal IC	TPA3128D2 2-Ch 30-W Differential Analog Input Class-D Amplifier With Low Idle Power Dissipation	Download
TPS61178	semiconductor;Power management	TPS61178 20-V Fully Integrated Sync Boost with Load Disconnect	Download

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Update:2024-11-14 23:47:53

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