A reference design for a tiny, 65-W, 94% efficient ac/dc power adaptor for laptops measures just 3.19 in.3 and has a power density of 20 W/in3. This high efficiency means that the device runs cooler than standard ac/dc adapters. At the core of this adapter is a synchronous rectifier circuit using 150-V, 7-mΩ EPC2033 eGaN … Continue reading Laptop power adaptor hits 94% efficiency, squeezes into 3.19 in.³ space