Power Integrations has introduced a family of off-line, ac-dc converter ICs delivering up to 6.1W in wide-input range designs, and up to 9.2W for 230Vac open-frame applications. Designed for isolated and non-isolated fly-back topologies and called LinkSwitch-XT2, the family can achieve current and voltage regulation of better than -/+3% and typical efficiency above 80%. LinkSwitch-XT2 ICs consume less ...
Read full article: Mains power chip is efficient at 6W
from Electronics Weekly http://www.electronicsweekly.com/news/products/power-supplies/mains-power-chip-efficient-6w-2017-01/
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