FAN6206

FAN6206 —Highly Integrated Dual-Channel Synchronous Rectification Controller for Dual-Forward Converter April 2010 FAN6206 Highly Integrated Dual-Channel Synchronous Rectification Controller for Dual-Forward Converter Features ƒ ƒ ƒ ƒ ƒ ƒ Highly Integrated Dual-Channel SR Controller Receives Synchronized Driving Signal from the Primary Side Internal Linear-Predict Timing Control for DCM Operation Ultra-Low VDD Operating Voltage for Different Output Voltage of PC Power VDD Over-Voltage Protection 14V Gate Driver Clamp Description The highly integrated FAN6206 is a dual-channel synchronous rectification (SR) controller. FAN6206 allows design of a cost-effective power supply with fewer external components, especially suited for dualforward topology used to obtain higher efficiency for ATX power supplies. The primary-side control method provides synchronous rectification control for dual-forward converters that operate in continuous conduction mode (CCM). FAN6206 includes a proprietary linear-predict timing control mechanism for dual-forward converters that operate in discontinuous conduction mode (DCM) at fixed or variable frequency. PWM frequency tracking with secondary-side winding detection is provided by adding dividing resistors. The primary-side signals are generated from Fairchild’s FAN6210 (Primary-Side Synchronous Rectifier Signal Trigger for Dual-Forward Converter). The primary-side signals are transferred through a pulse transformer to the secondary-side. The benef...