GaN technology is driving server power supplies through a major evolutionary shift toward smaller size and higher power density. The function of the auxiliary power supply as defined by the modular Common Redundant Power Supply (CRPS) specification is to provide 36W of standby power to the server as well as any house-keeping power required by the power supply itself. This presentation will teach the audience how the active clamp flyback with GaN can be optimized for server power supplies and the CRPS. Details of the design, simulation, construction and test of the planar transformer will be provided along with layout techniques for minimizing size, while still meeting creepage and clearance requirements. To summarize the discussion, the final solution will be presented, along with lab test data.
