1 Features
1• High-Power, Primary-Side CV/CC Regulation
• Continuous Conduction Mode (CCM) and
Discontinuous Conduction Mode (DCM) Operation
• Built-In 700-V Start-Up Current Source
• Active X-Capacitor Discharge (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%
• PSR design with no opto-coupler - can meet high
CM isolation & surge requirements
• VDD OVP for independent indirect output OV
under open-feedback fault conditions
• 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)
• Create a Custom Design Using the UCC2863x
With the WEBENCH® Power Designer

2 Applications
• 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)

3 Description
The UCC2863x targets high-power, primary-side
regulated flyback converters. The 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 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 to reduce both controller and system power
consumption at no load and light load. These modes
enable potential system designs to meet 30-mW noload
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.
See the Device Comparison Table for details.