FEBFAN7688SJXA-CP14U306-GEVB: 306 W/12 V PC application with 12 VSB module evaluation board

The LLC converter in this Evaluation Board (EVB) is controlled by the FAN7688; it’s a 16-pin controller and locates in secondary side. The FAN7688 includes PFM and PWM controls to optimization efficiency for all loading, its combine advantage SR control improves efficiency. It employs a current mode control technique based on charge control; this provides a better control-to-output and line-to-output transfer function of the power stage, simplifying the feedback loop design while allowing true input power limit capability. The PFC is controlled by the FAN6982, based on Continuous Conduction Mode (CCM), which employs leading edge modulation for average current control and has a number of advanced features for better performance and reliability.
Features and Applications


Features
LLC:Secondary Side PFM Controller with Synchronous Rectifier ControlCharge Current Control for better Transient Response and Simplified Feedback Loop DesignAdaptive Synchronous Rectification Control with Dual Edge TrackingClosed Loop Soft-StartGreen Functions to Improve Light Load EfficiencySymmetric PWM Control at Light Load to Limit the Switching Frequency while Reducing Switching LossesDisabling SR During Light Load OperationComplete Protection Functions with Auto-Restart
PFC:Continuous Conduction Mode and Average-Current-Mode ControlPower-On Sequence ControlBrownout ProtectionFulfills Class-D Requirements of IEC 61000-3-2Universal AC Input VoltageEfficiency Optimization by External Output Voltage Adjustable Circuit