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.