Power Electronics Europe Issue 4 - November 2022

RIGHT Table 4: Efficiency and cost comparison of four- and two-MOSFET options available for Wolfspeed’s 3.6 kW design 30 WBG DATACENTER www.wolfspeed.com 60-67 kHz ranges to keep harmonics under 150 kHz for CE’s EMI requirements. This negates GaN’s advantage from low switching losses. Wolfspeed’s 3.6 kW solution Wolfspeed’s new 3.6 kW totem-pole PFC reference design (Table 3, last row) is aimed at solving the datacenter and server power supply challenge with >99% efficiency at half load and >98.5% full load, achieving 80 Plus Titanium and ErP Lot 9 requirements. The design also offers the flexibility to tradeoff some of the high efficiency for lower cost, while still meeting the efficiency standards mentioned above (Table 4). The lower cost option replaces two of the MOSFETs in the low-frequency (LF) leg of the design with diodes, while retaining them in the high-frequency (HF) leg. A two-daughter-card design concept gives customers the flexibility to choose the right option depending on their system design priorities. In developing such solutions, Wolfspeed uses its experience building a broad portfolio of the most field- tested SiC and GaN on SiC solutions on the market. Literature WiWynn Corp., et al, 48V: An Improved Power Delivery System for Datacenters (http://www.wiwynn.com/english/ company/newsinfo/1038) Wolfspeed, et al, Silicon Carbide Enables PFC Evolution, Aug. 17, 2020 (https://www.wolfspeed.com/ knowledge-center/article/ silicon-carbide-enables-pfc-evolution) VISIT US AT PCIM BOOTH #9-453 Kool Mµ ® Hƒ Powder Cores Lowest Losses for High Frequencies Optimized for 200-500 kHz Edge ® Powder Cores Best DC Bias for Cutting Edge Performance and Compact Design www.mag-inc.com DC Bias (Oe) % Initial Permeability µ i 100% 90% 80% 70% 60% 50% 40% 10 100 600 60µ Edge 60µ High Flux Flux Density (Tesla) Core Loss (mW/cm 3 ) 1,000 10,000 100 50 0.01 0.1 1 100 kHz Kool Mµ 500 kHz Kool Mµ 500 kHz Kool Mµ Hƒ 100 kHz Kool Mµ Hƒ 60µ Core Loss Density