• High-Power, Primary-Side Regulation for Output Voltage and Current, No Opto-Coupler Required
• Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) Operation
• Built-In 700-V Start-Up Current Source
• Active X-Capacitor Discharge Function (UCC28630 and UCC28633)
• Adjustable Constant-Current (CC) Mode Limiting (except for UCC28630)
• High Gate Drive Current 1-A Source and 2-A Sink
• Low Power Modes for <30-mW System Standby
• Best-In-Class Light Load (10%) Efficiency >85% for 65-W Nominal Power Design
• Peak-Power Mode for Transient Overload
• Shutdown Pin Interface for External NTC
• Protections: Overvoltage, Overcurrent, Over-Temperature, Overload Timer (UCC28630), AC Line UV, Brownout and Pin Protections
• Frequency Dither to Ease EMI Compliance (except the UCC28632)

• AC-DC Adapters for Notebook, Game Consoles, Printers
• Open Frame SMPS for Industrial, Printer, White Goods, LCD Monitors
• Energy Efficient AC-DC Supplies for Nominal Power 10-W to 65-W, (with up to 200% transient peak power)

The UCC2863x targets high-power, primary-side regulated flyback converters. The powerful gate driver and ability to operate in both CCM and DCM make the device suitable for applications with a wide power range. The peak power mode allows transient peak power delivery up to 200% of nominal rating, with only a 25% peak current increase, maximizing transformer utilization.

The transformer bias winding is used to sense output voltage for regulation, and for low-loss input voltage sensing. Advanced sampling and processing techniques allow CCM operation, and deliver excellent output voltage regulation performance for opto-coupler-less designs at power levels of 100 W and above.

A high-voltage current source enables fast and efficient start-up. Advanced light-load modes are deployed (including switching frequency modulation and device sleep modes) to reduce both controller and system power consumption at no load and light load. These modes enable potential system designs to meet 30-mW no-load power for power designs up to 30 W nominal, 60 W peak.

The device has been designed for ease-of-use and incorporates many features to enable a wide range of designs. Extensive protection features are included to simplify system design.