Circuit design of 70W audio amplifier power supply
Summary:
The isolated flyback converter is a 32V, 2.2A (70W) power supply that provides 126 W of peak power (temperature dependent) in a short period of time.
design feature
- Can output high peak power without causing amplifier distortion
- Working in a dual input voltage range, a single design is suitable for global use
- high efficiency:
- 88% efficiency at 70 W output power
- Meet the CEC 2008 average efficiency of 86%, the requirement is 85%
- Low no-load power consumption, less than 350 mW at 115/ 230 VAC AC input
- Provides open-loop and output short-circuit latch protection with fast AC reset
- Compliant with CISPR-22/EN55022 B conducted EMI limits, EMI margin greater than 10 dBμV
- Integrated safety and reliability:
- Internal current limit
- Precise, auto-recovery and hysteretic shutdown with hysteresis to keep PCB temperature within safe conditions under all conditions
- Automatic restart function protects power supply when voltage drops slowly
Circuit diagram of 70W audio amplifier power supply
See the uploading documentation for details (click to download)
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Jiangsu Vantek Power Machinery Co., Ltd , https://www.vantekpower.com