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

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Schematic/Block Diagram

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(Output Voltage 1)
Vin (Min) (V)10
Vin (Max) (V)16
Vout (Nom) (V)35
Iout (Max) (A)8.6
Output Power (W)301
Input TypeDC
TopologyBuck Boost- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5176  55V wide VIN synchronous 4-switch buck-boost controller  Buck-boost & inverting regulators  Sample & Buy View Design Kits & Evaluation Modules
SN74LV1T04  Single Power Supply INVERTER Gate logic level shifter  Voltage level translators  Sample & Buy View Design Kits & Evaluation Modules
TL432  Adjustable precision shunt regulator (reverse pinout)  Voltage references  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5176 Download Download
SN74LV1T04 Download Download
Download Download
TL432 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 4461 28 Jun 2019
Design files (6)
Title Type Size (KB) Date
ZIP 638 28 Jun 2019
ZIP 947 28 Jun 2019
PDF 1952 28 Jun 2019
PDF 215 28 Jun 2019
PDF 101 28 Jun 2019
PDF 408 28 Jun 2019

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