Variable voltage power converter 5-35-V 300-W peak reference design for automotive audio amplifiers


Design files


This reference design provides a variable output power for audio amplifiers from 5 V to 35 V controllable by a Pulse Width Modulator signal. The output power capability of 75 W RMS and 300 W peak is suitable for high power automotive audio amplifiers. Conversion is 4-switch Buck-Boost for greater than 95% conversion efficiency. Output can be slewed over the 5 V to 35 V range with ~1 millisecond response time to maximize efficiency of the audio amplifier using this power. This design includes schematic, Bill of Materials, layout files and a test report.

  • Variable DC power for audio amplifiers 5-35 V out 300-W peak, 75-W RMS
  • Output voltage controlled by pulse width modulated (PWM) signal
  • Rapid ~1 millisecond, but controlled response to command to change Vout
  • 4-switch buck-boost for 95% efficiency, or better, at heavy loading
Output voltage options PMP21697.1
Vin (Min) (V) 10
Vin (Max) (V) 16
Vout (Nom) (V) 35
Iout (Max) (A) 8.6
Output Power (W) 301
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Buck 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.

TIDT119.PDF (4532 K)

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

TIDRK85.PDF (408 K)

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


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


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

TIDRLK7.PDF (1952 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
Test report Variable Voltage Power Converter 5-35 V 300 W Peak Reference Design Jun. 28, 2019

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