Envelope-Tracking Power Supply Reference Design for Audio Power Amplifiers


Design files


This envelope-tracking power reference design maintains helps extend battery life in a portable audio applications, such as Bluetooth® or Wi-Fi speakers. The low-power step-down converter in the design features envelope-tracking capability to an audio power amplifier, maintaining high efficiency across the output voltage range. By adding an audio envelope signal to the FB pin of TI’s TPS61178 device, the output voltage can change in accordance with the envelope of the audio signal thus dynamically adapting the TPA3128D2 power amplifier’s supply and optimizing its power consumption.

  • 5.4V to 8.4V input voltage range
  • 2X20W into a 8-Ω load at Vin=7.2V
  • Programmable power limit
  • Isolate the input battery from the output side when shut down
  • High efficiency and small solution size
Output voltage options PMP15036.1
Vin (Min) (V) 5.4
Vin (Max) (V) 8.4
Vout (Nom) (V) 18
Iout (Max) (A) 1.5
Output Power (W) 27
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Boost- Synchronous
?? View video with transcript Video

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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRSV6.ZIP (1360 K)

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

TIDCDV6.ZIP (1103 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS6117820-V, 10-A fully integrated sync boost with load disconnect

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

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

Data sheet: PDF
Speaker amps

TPA3128D230-W stereo, 60-W mono, 4.5- to 26-V, analog input Class-D audio amplifier w/ low idle current

Data sheet: PDF | HTML

Technical documentation

= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Test report PMP15036 Test Results Sep. 25, 2017

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​