Circuit design of universal input, 0.98W output flyback power supply

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Summary:

Universal input with a LNK562DN design, 0.98 W output flyback power supply. The power supply output is 7 V, 0.14 A (1W) with loose constant voltage/constant current (CV/CC) characteristics. This power supply replaces two electrolytic capacitors in series with a low value metal film capacitor of 630 V rated voltage. This design is ideal for single-phase meters or applications that must withstand AC input voltages up to 350 VAC in a matter of minutes.

0.98W Flyback Power Supply Design Features

• No need to use input bulk capacitors
• Increased reliability of products used in areas with severe input voltage fluctuations
• Saves on the superposition of two electrolytic capacitors for increasing the voltage rating
• PCB space and reduced costs
• Extremely energy efficient
• Meets CEC/Energy Star 2008 requirements for work mode efficiency (required
• 50%, up to 55%)
• Low input power at no load (no-load power consumption is less than 230 VAC AC input)
• 200 mW, required to be 500 mW)
• Low cost, low component count, alternative to compact and lightweight linear power supplies
• No optocoupler required
• No constant current detection resistor required
• Simple EMI filter in accordance with EN55022B

Circuit diagram of 0.98W output flyback power supply

See the uploading documentation for details (click to download)