Laptop adaptor maker switches to GaN to boost power density

June 07, 2017 // By Graham Prophet
Gallium nitride power device maker Efficient Power Conversion (EPC) is quoting one of its design wins as an example of the benefits of using wide-bandgap power devices. Its customer Rompower (Bucharest, Romania, and Tucson, Arizona) has announced a 65W AC/DC laptop power adaptor technology capable of 94% efficiency, amounting to 20 W/in³ power density

The reference design occupies 3.19 cubic inches (0.92 x 1.45 x 2.39 in., or 23.4 x 36.8 x 60.7 mm) and provides 65W of power at greater than 94% efficiency over the entire input voltage range (90 Vac – 264 Vac). At the core of this adapter is a synchronous rectifier circuit using 150V, 7 mOhm EPC2033 eGaN FETs from EPC. EPC presents these GaN FETs as providing an 80% reduction in driving power, with a 25% reduction in on resistance. This enables a 5% reduction in power dissipation in the adaptor design due to the use of GaN FETs as synchronous rectifiers, and 9.5% less power dissipation using GaN devices as the primary switch.







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