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.
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