Flyback power supply circuit design for ultra-low no-load and standby power consumption

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Summary:

The power supply is a general-purpose input flyback power supply with an output of 20W and a TOP256MN device. Typical applications include PC standby power and other designs that require ultra-low no-load and standby power.

design feature

• No-load power consumption is very low (less than 150 mW) over the entire input voltage range
• high efficiency
• Efficiency is greater than 84% at different input voltages and loads
• Easily meet CEC/Energy Star 2.0
• 81% and EU CoC
• Achieve 83% average efficiency requirements
• 77% efficiency at 0.25 A load
• Easily meet the 2 W input power limit of Energy Star 5.0
• 81% efficiency at 0.60 A load
• Easily meet Energy Star 5.0's 4 W input power limit
• Integrated safety and reliability:
• Precise, auto-recovery and hysteretic shutdown with hysteresis to keep PCB temperature within safe conditions under all conditions
• Enters the auto-restart protection state when the output short circuit and the feedback loop open loop

Universal input, 20 W output PC standby power circuit

See the uploading documentation for details (click to download)