link to page 1 link to page 1 link to page 1 link to page 1 link to page 3 link to page 3 link to page 3 link to page 4 link to page 7 link to page 11 link to page 12 link to page 13 link to page 13 link to page 17 link to page 17 link to page 19 link to page 21 link to page 25 link to page 25 link to page 26 link to page 27 link to page 31 link to page 37 link to page 38 link to page 40 link to page 47 link to page 48 link to page 48 LT8311 TABLE OF CONTENTS Features .. 1Applications ... 1Typical Application ... 1Description... 1Absolute Maximum Ratings ... 3Order Information ... 3Pin Configuration ... 3Electrical Characteristics .. 4Typical Performance Characteristics .. 7Pin Functions ...11Block Diagram ..12Operation..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 ...40Package Description ..47Typical Application ..48Related Parts ...48 8311f 2 For more information www.linear.com/LT8311 Document Outline Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation FUNDAMENTALS OF FORWARD CONVERTER OPERATION IN CCM LT8311 SYNCHRONOUS CONTROL SCHEMES PREACTIVE MODE SYNCHRONOUS CONTROL SYNC MODE SYNCHRONOUS CONTROL OPTO-COUPLER CONTROL Applications Information VIN BIAS SUPPLY INTVCC BIAS SUPPLY LT8311 OPTO CONTROL FUNDAMENTALS LT8311 SYNCHRONOUS CONTROL FUNDAMENTALS PREACTIVE MODE SYNCHRONOUS CONTROL SYNC MODE SYNCHRONOUS CONTROL Typical Applications Package Description Typical Application Related Parts