FairchildFAN6208LLC電源同步整流控制方案

Fairchild 公司的FAN6208是用于絕緣的LLC或LC諧振轉換器的同步整流(SR)控制器,能驅動兩個單獨 SRMOSFET,通過監測每個SR的漏-源極電壓來測量每個開關周期的SR導通時間,從而確定SR柵極驅動的最佳時間.具有先進的輸出短路/過載保護以及超溫保護(OTP),主要用在 LCD TV, PC電源和開架開關電源.本文介紹了FAN6208主要特性,方框圖,應用電路圖以及FEBFAN6208_CP433v1評估板主要指標,電路圖,材料清單和PCB布局圖.

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 highefficiency power supply design with fewer components.

FAN6208主要特性:

? 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)

FAN6208應用:

? LCD TV

? PC Power

? Open-Frame SMPS

圖1.FAN6208方框圖


圖2.FAN6208應用框圖

圖3.FAN6208應用電路圖
圖3應用電路圖主要指標:

FEBFAN6208_CP433v1評估板

This user guide supports the FAN6208 Secondary-Side Synchronous Rectifier evaluation board.

FEBFAN6208_CP433v1評估板主要指標:


圖4.FEBFAN6208_CP433v1評估板外形圖

圖5.FEBFAN6208_CP433v1評估板電路圖

FEBFAN6208_CP433v1評估板材料清單:



圖6.FEBFAN6208_CP433v1評估板PCB布局圖:上,頂部;下,底部

詳情請見:
http://www.fairchildsemi.com/ds/FA/FAN6208.pdf
和
http://www.fairchildsemi.com/products/evaluationboards/FEBFAN6208_CP433v1.pdf?user-guide=