ZXGD3105

Description ZXGD3105N8 synchronous controller is designed for driving a MOSFET as an ideal rectifier. This is to replace a diode for increasing the power transfer efficiency. Proportional Gate drive control monitors the reverse voltage of the MOSFET such that if body diode conduction occurs a positive voltage is applied to the MOSFET’s Gate Pin. Once the positive voltage is applied to the Gate the MOSFET switches on allowing reverse current flow. The controllers’ output voltage is then proportional to the MOSFET Drain-Source voltage and this is applied to the Gate via the driver. This action minimizes body diode conduction whilst enabling a rapid MOSFET turn-off as the Drain current decays to zero. Applications Flyback Converters in:  Low Voltage AC- DC Adaptors  Set-Top-Box  PoE Power Devices Resonant Converters in:  Telecoms PSU  Laptop Adaptors  Computing Power Supplies – ATX and Server PSU ZXGD3105N8 SYNCHRONOUS MOSFET CONTROLLER IN SO-8 Features  Proportional Gate Drive to Minimize Body Diode Conduction  Low Standby Power with Quiescent Supply Current <1mA  4.5V Operation Enables Low Voltage Supply  25V VCC Rating  100V Drain Voltage Rating  Operation up to 500kHz  Critical Conduction Mode (CrCM) & Continuous Mode (CCM)  Compliant with Eco-Design Directive  Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2)  Halogen and Antimony free. “Green” Device (Note 3)  Qualified to AEC-Q101 Standards for High Reliability Mechanical Data  Case: SO-8  Case Ma...