As modern-day server power supply units (PSUs) are continuously optimized for higher power density and efficiency, it is important to recognize and address all sources of losses to achieve the highest performance. The auxiliary power supply is contained within every server PSU and often contributes to the total size and efficiency of the entire solution. Decreasing the power losses associated with this power supply can significantly affect the entire system performance to abide by stringent requirements such as 80 plus Titanium efficiency. This session provides a comparison of seven total solutions that employ a mix of different flyback variants, GaN/Si power FETs, and output rectifiers. Each solution is analyzed on the basis of FET conduction/switching losses, driver losses, clamp losses, output rectifier conduction losses, and transformer losses. This comparison is translated to the total % of efficiency gains that can be achieved in the entire server PSU solution.
