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 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.
See the Device Comparison Table for details.