Diodes has announced a 25V rated synchronous MOSFET controller for notebook and laptop power supplies of 90W and above. By enabling the replacement of inefficient Schottky diodes in flyback converters, the ZXGD3104N8 reduces rectifier losses of up to 70%. As a result, the controller helps power supplies more easily attain the 87% Energy Star V2.0 rating, according to the company.
With its operating voltages of 5 to 25V, the SO8 packaged MOSFET controller is able to be directly powered from the adaptor's 19V supply rail. Combined with the controller's direct 180V MOSFET drain-sense capability, which eliminates the need for an external clamp circuit, the component count can be reduced and space can be saved, claims the company. The controller's proportional gate-drive operation guards against premature MOSFET turn-off as the drain current decays, thereby maximising circuit efficiency and ensuring body diode conduction losses are minimised, says the company.
