LT8311

2

8311f

For more information www.linear.com/LT8311

TABLE OF CONTENTS

Features............................................................................................................................ 1

Applications ....................................................................................................................... 1

Typical Application ............................................................................................................... 1

Description......................................................................................................................... 1

Absolute Maximum Ratings..................................................................................................... 3

Order Information................................................................................................................. 3

Pin Configuration ................................................................................................................. 3

Electrical Characteristics........................................................................................................ 4

Typical Performance Characteristics .......................................................................................... 7

Pin Functions .....................................................................................................................11

Block Diagram....................................................................................................................12

Operation..........................................................................................................................13

FUNDAMENTALS OF FORWARD CONVERTER OPERATION IN CCM..................................................................... 13

LT8311 SYNCHRONOUS CONTROL SCHEMES..................................................................................................... 17

PREACTIVE MODE SYNCHRONOUS CONTROL.................................................................................................... 17

SYNC MODE SYNCHRONOUS CONTROL ............................................................................................................. 19

OPTO-COUPLER CONTROL .................................................................................................................................. 21

Applications Information .......................................................................................................25

VIN BIAS SUPPLY.................................................................................................................................................. 25

INTVCC BIAS SUPPLY............................................................................................................................................ 26

LT8311 OPTO CONTROL FUNDAMENTALS........................................................................................................... 27

LT8311 SYNCHRONOUS CONTROL FUNDAMENTALS.......................................................................................... 31

PREACTIVE MODE SYNCHRONOUS CONTROL ................................................................................................... 37

SYNC MODE SYNCHRONOUS CONTROL ............................................................................................................ 38

Typical Applications .............................................................................................................40

Package Description ............................................................................................................47

Typical Application ..............................................................................................................48

Related Parts .....................................................................................................................48