GaN Power ICs Enable 300cc 700kHz 300W AC-DC Converter

Inhalt:
A 300 W, AC-to-DC converter has been designed and demonstrated to achieve > 94% efficiency during 90 Vac and 100% load conditions, and an estimated cased size of 300 cc. The circuit topology includes a totem-pole PFC input stage, an LLC dc-dc stage, and a synchronous rectification output stage. The design includes GaNFast Power ICs and off-the-shelf controllers running at 700 kHz. This new design has resulted in a cased power density of 1 W/cc. The waveforms demonstrate zero-voltage switching in all stages and the performance results show very high efficiency and power density, and acceptable component temperatures.