Envelope-Tracking Power Supply Reference Design for Audio Power Amplifiers with TPS61088


Design files


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
Output voltage options PMP9774.1
Vin (Min) (V) 2.7
Vin (Max) (V) 4.2
Vout (Nom) (V) 5.5
Iout (Max) (A) 2
Output Power (W) 11
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- Synchronous
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDRJ76.PDF (353 K)

Detailed schematic diagram for design layout and components

TIDRJ77.PDF (122 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRJ78.PDF (128 K)

Detailed overview of design layout for component placement

TIDRJ80.ZIP (1536 K)

Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRJ79.PDF (726 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS6108810-A Fully-Integrated Synchronous Boost Converter

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA4377Quad low-cost, low-noise, 5.5-MHz CMOS operational amplifier

Data sheet: PDF

Technical documentation

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Type Title Date
Test report Envelope-Tracking Power Supply for Audio Power Amplifiers TPS61088 Design Guide Sep. 10, 2015

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