UCC28910FBEVM-526: 5V @ 1.2A, 85 ~ 265VAC in

The UCC28910FBEVM-526 evaluation module is an offline flyback power supply that provides isolated output voltage and current regulation without the use of an optocoupler. The input accepts a voltage range of 85VAC to 265VAC.

The evaluation module uses the UCC28910 CV/CC PWM HV Switcher. This device integrates a 700 V power FET and controller that processes operating information from an auxiliary flyback winding and from the power FET to provide precise output voltage and current control. Control algorithms in the UCC28910 allow operating efficiencies to meet or exceed applicable standards. Discontinuous conduction mode (DCM) with valley switching is used to reduce switching losses. A combination of switching frequency and peak primary current amplitude modulation is used to keep conversion efficiency high across the full load and input voltage range. Fig.1 details the output V-I characteristic.

Low system parts count and built in advanced protection features result in a cost-effective solution that meets stringent world-wide energy efficiency requirements.

This user’s guide provides the schematic, component list, assembly drawing, art work, and test set up necessary to evaluate the UCC28910 in a typical off-line converter application.