This reference design is an ultra-wide input, offline, high-side buck reference design that provides a 13V output at a maximum of 0.6A. The input voltage range is between 85V_AC to 485V_AC. The reference design uses the UCC28750 current-mode flyback controller without opto-coupler feedback. There is no isolation, the design uses a low cost current mirror to regulate the output. The design is developed to be resistant to magnetic fields up to 200mT near the inductor.

• Wide input range: 100V_DC to 630V_DC
• Resistant to external magnetic fields
• Output short-circuit (OSC) protection
• Frequency dithering for improved electromagnetic interference (EMI)
• Frequency foldback and burst mode for improved light load efficiency
• UCC28750 controller with low cost current mirror

• Electricity meter
• DC-input BLDC motor drive
• String inverter
• Refrigerator and freezer
• Washer and dryer

Top Photo

Angled Board Photo

Bottom Photo