FAN6208 datasheet(1/10 Pages) FAIRCHILD

Numer części	FAN6208

Szczegółowy opis	Secondary-Side Synchronous Rectifier (SR) for LLC Resonant Converter

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Rev. 1.0.1 • 3/10/11

AN-6208

Secondary-Side Synchronous Rectifier (SR) for

LLC Resonant Converter Using FAN6208

Introduction

The LLC resonant converter has drawn a lot of attention

recently due to its advantages over a conventional series

resonant converter and parallel resonant converter: narrow

frequency variation over wide load, input variation, and

Zero Voltage Switching (ZVS) for the entire load range.

In an LLC resonant converter, rectifier diodes are typically

used to obtain DC output voltage from the transformer

secondary winding. The conduction loss of diode rectifier

contributes significantly to the overall power losses in an

LLC resonant converter; especially in low output voltage

applications.

The

conduction

loss

of

a

rectifier

is

proportional to the product of its forward-voltage drop and

the

forward

conduction

current.

Using

synchronous

rectification (SR) where the rectifier diode is replaced by

MOSFET with a small on resistance (RDSON), the forward-

voltage drop of a synchronous rectifier can be lower than

that of a diode rectifier and, consequently, the rectifier

conduction loss can be reduced.

FAN6208 is a synchronous rectification 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 SR gate

drive. FAN6208 also 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 light-load efficiency, Green Mode disables the SR

drive signals, minimizing gate drive power consumption at

light-load conditions.

This application note describes the design procedure for a

SR circuit using FAN6208. The guidelines for printed

circuit board (PCB) layout and a design example with

experiment results are also presented. Figure 1 shows the

typical application circuit of FAN6208.

Figure 1. Typical Application

Podobny numer części - FAN6208

Producent	Numer części	Arkusz danych	Szczegółowy opis
Fairchild Semiconductor	FAN6208	1Mb / 18P	Secondary-Side Synchronous Rectifier Controller
	FAN6208MY	1Mb / 18P	Secondary-Side Synchronous Rectifier Controller
	FAN6208MY	1Mb / 18P	Secondary-Side Synchronous Rectifier Controller for LLC Topology
	FAN6208	1Mb / 18P	Secondary-Side Synchronous Rectifier Controller for LLC Topology

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Podobny opis - FAN6208

Producent	Numer części	Arkusz danych	Szczegółowy opis
ON Semiconductor	FAN7688	1Mb / 32P	Advanced Secondary Side LLC Resonant Converter November 2015 Rev. 1.3
	NCP4390	694Kb / 30P	Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control June, 2020 ??Rev. 1
	NCP4390	769Kb / 30P	Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control November, 2021 - Rev. 2
STMicroelectronics	AN3303	2Mb / 27P	Secondary-side rectification for an LLC resonant converter
ON Semiconductor	NCV4390	776Kb / 30P	Automotive Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control June, 2020 ??Rev. 1
ON Semiconductor	NCV4390	765Kb / 30P	Automotive Advanced Secondary Side LLC Resonant Converter Controller with Synchronous Rectifier Control November, 2021 ??Rev. 2
Fairchild Semiconductor	FAN6208	1Mb / 18P	Secondary-Side Synchronous Rectifier Controller for LLC Topology
ON Semiconductor	FAN6248HC	281Kb / 15P	Advanced Synchronous Rectifier Controller for LLC Resonant Converter January, 2018 ??Rev. 2
ON Semiconductor	NCP4318	1Mb / 22P	Advanced Synchronous Rectifier Controller for LLC Resonant Converter March, 2021 ??Rev. 1
STMicroelectronics	SRK2001	446Kb / 22P	Adaptive synchronous rectification controller for LLC resonant converter

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