This reference design is an ultra-wide input offline high-side buck power supply that provides a 13V output at a maximum of 0.6A. The input accepts a voltage range of 85V_AC to 485V_AC. The reference design uses the UCC28750 current-mode flyback controller with optocoupler feedback. The design is developed to be resistant to magnetic fields up to 200mT near the inductor.

• Fixed-frequency operation for full load
• Frequency foldback and burst mode for improved light-load efficiency
• Very wide input voltage range: 85V_AC to 485V_AC
• Overvoltage and undervoltage lockout
• Output short-circuit (OSC) protection
• Cycle-by-cycle peak overcurrent limit
• High magnetic resistance

• Electricity meter
• AC-input BLDC motor drive
• String inverter

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