Audio amplifier power circuit design using PKS607YN

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Photocoupler

Summary:

working principle

The isolated flyback converter is a 32 V, 2.2 A (70 W) power supply that provides 126 W of peak power (temperature dependent) in a short period of time.

The design uses a voltage multiplier for dual voltage operation (SW1, C4, and C5) at 115/230 VAC input. Diodes D5 and C15 perform AC line voltage sensing, which provides undervoltage (UV) latch protection against output voltage disturbances and fast AC reset.

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

70W continuous output, 130W peak audio amplifier power supply circuit diagram

See the PDF document for details (click on the PDF file to download)