MOSFET Controller from Diodes Incorporated Increases PSU Efficiency for Energy Star Rating



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Diodes Incorporated announces a 25V rated synchronous MOSFET controller for notebook and laptop power supply designs of 90W and above. By enabling the replacement of inefficient Schottky diodes in flyback converters, the ZXGD3104N8 increases power supply efficiency by up to 3.5% through a reduction in rectifier losses of up to 70%. As a result, the device helps power supplies more easily attain the 87% Energy Star V2.0 rating. With its wide operating voltage range of 5V to 25V, this SO8 packaged MOSFET controller is able to be directly powered from the adaptor's 19V supply rail, while ensuring sufficient headroom in the event of transient over-voltage conditions. Combined with the device's direct 180V MOSFET drain-sense capability which eliminates the need for an external clamp circuit, designers can significantly reduce component count and save space. The ZXGD3104N8's proportional gate-drive operation guards against premature MOSFET turn-off as the drain current decays, thereby maximizing circuit efficiency and ensuring body diode conduction losses are minimized. This, combined with the short turn-off propagation delay of typically 15ns, helps to maximize power supply circuit efficiency. The ZXGD3104N8 synchronous MOSFET controller for flyback converters is priced at $0.50 USD in 10,000 pieces. Further information from