MOSFET controller

18 August 2010 Power Electronics / Power Management

Diodes Incorporated has released a synchronous MOSFET controller for driving a MOSFET in place of a Schottky diode in the secondary side of flyback and resonant converters. Designed to maximise circuit efficiency and help achieve Energy Star product ratings, the ZXGD3103N8 enables designers to reduce rectifier losses by up to 70% and increase power supply efficiency by up to 3,5%.

Comprising a differential amplifier, detector and high-current driver, the device monitors MOSFET reverse voltage and applies a positive turn-on voltage to the gate if body diode conduction is detected. Being proportional to the MOSFET drain-source reverse voltage, the gate drive voltage guards against premature turn-off of the MOSFET, thereby maximising circuit efficiency.

To further improve efficiency, the controller’s low detector threshold voltage (typically 10 mV) means that body diode conduction is kept to a minimum. In addition, very fast turn-off propagation and fall times, respectively 15 and 20 ns, ensure shoot-through or reverse current conduction are minimised. The SO8 packaged ZXGD3103N8 can be powered directly from supply rails between 5 and 15 V or higher via an external regulator. Its ability to block drain voltages up to 180 V means no external clamping circuit is required and its low standby current, typically 5 mA, enables compliance with the Energy Star standby rating.

For more information contact Dennis Walden, Avnet Kopp, +27 (0)11 809 6100, [email protected], www.avnet.co.za

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