Secondary-Side Synchronous Rectifier Controller
FAN6208 —Secondary-Side Synchronous Rectifier Controller for LLC Topology
October 2014
FAN6208 Secondary-Side Synchron...
Description
FAN6208 —Secondary-Side Synchronous Rectifier Controller for LLC Topology
October 2014
FAN6208 Secondary-Side Synchronous Rectifier Controller for LLC Topology
Features
Specialized SR Controller for LLC or LC Resonant
Converters
Secondary-Side Timing Detection with Timing
Estimator
Gate-Shrink Function to Prevent Shoot-Through
During Load and Line Transient
Green-Mode Function for Higher Efficiency at Light-
Load Condition
Programmable Dead Time between Primary-Side
Gate Drive Signal and SR Drive Signal
Advanced Output-Short / Overload Protection
Based on the Feedback Information
Internal Over-Temperature Protection (OTP) VDD Pin Over-Voltage Protection (OVP)
Description
FAN6208 is a synchronous rectification (SR) controller for isolated LLC or LC resonant converters that can drive two individual SR MOSFETs emulating the behavior of rectifier diodes. FAN6208 measures the SR conduction time of each switching cycle by monitoring the drain-to-source voltage of each SR and determines the optimal timing of the SR gate drive. FAN6208 uses the change of opto-coupler diode current to adaptively shrink the duration of SR gate drive signals during load transients to prevent shoot-through. To improve lightload efficiency, Green-Mode operation is employed, which disables the SR drive signals, minimizing gate drive power consumption at light-load condition.
Optimal timing circuits and protection functions are integrated in an 8-pin SOP package, which allows highefficie...
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