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https://www.mornsun-power.com/html/products/1986/switching-regulator.html

As a smps power supply manufacturer, MORNSUN DC DC switching regulator is the high efficiency non-isolated high efficiency dc dc converter with the package of SIP, DIP, SMD or chassing mounting, and the efficiency is high up to 95%. The newest regulated output K78-R4 series released recently has undergone a fundamental change in dimension and packaging which manufactured via the ic chip let SiP(system in package) process, and the appearance of R4 has changed from the simple and roughness to the refinement.