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

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 RMSOutput voltage controlled by pulse width modulated (PWM) signalRapid ~1 millisecond: but controlled response to command to change Vout4-switch buck-boost for 95% efficiency: or better: at heavy loading