MOSFET controller from Diodes Incorporated raises efficiency of AC-DC converters

Comprising a differential amplifier detector and high current driver, the ZXGD3103N8 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, so maximizing circuit efficiency.

To further improve efficiency, the MOSFET controller's low detector threshold voltage, typically 10mV, means that body diode conduction is kept to an absolute minimum. In addition, very fast turn-off propagation and fall times, respectively 15ns and 20ns, ensures shoot-through or reverse current conduction are minimised, again, helping to maximize power supply circuit efficiency.

With its wide operating voltage range, the SO8 packaged ZXGD3103N8 can be powered directly from supply rails between 5V and 15V or higher via external regulator. Its ability to block drain voltages up to 180V means no external clamping circuit is required and its low standby current, typically 5mA, enables compliance with the Energy Star standby rating.