Envelope-Tracking Power Supply Reference Design for Audio Power Amplifiers with TPS61088
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This reference design delivers an envelope-tracking power supply circuit for audio power amplifier (PA) with TPS61088. By adding an audio envelope signal to the FB pin, the TPS61088’s output voltage can change in accordance with the envelope of the audio signal. So the TPS61088 provides a dynamically changing supply voltage to the PA. Thus the PA can always keep high efficiency in the whole output power range.

  • 2.7-4.2V input voltage range
  • 5.5-11.75V output voltage range
  • The output voltage changes linearly with the amplitude of the input audio signal
  • Output voltage rise up from 5.5V to 11.75V within 1ms under a full range step up of the audio signal
  • Higher efficiency compared to that of the traditional fixed supply PA

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Design Files

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(Output Voltage 1)
Vin (Min) (V)2.7
Vin (Max) (V)4.2
Vout (Nom) (V)5.5
Iout (Max) (A)2
Output Power (W)11
Input TypeDC
TopologyBoost- Synchronous

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA4377  Quad Low-Cost, Low Noise, 5.5MHz CMOS Operational Amplifier   Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TPS61088  10-A Fully-Integrated Synchronous Boost Converter  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA4377 Download Download
TPS61088 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 718 10 Sep 2015
Design files (6)
Title Type Size (KB) Date
ZIP 616 08 Dec 2015
ZIP 1536 08 Dec 2015
PDF 726 08 Dec 2015
PDF 128 08 Dec 2015
PDF 122 08 Dec 2015
PDF 353 08 Dec 2015

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