《PI反激变压器设计方法》.pdf

® ® TOPSwitch Flyback Transformer Construction Guide Application Note AN-18 Introduction Ferrite Core Manufacturer’s Catalogs This application note is a design and construction guide for Ferrite core manufacturers publish catalogs supplying core margin wound or triple insulated wire wound flyback dimensions and electrical characteristics used in transformer transformers suitable for use with TOPSwitch. Margin wound design. Some manufacturers also provide additional engineering and triple insulated wire transformer designs are derived in information for the more popular core sizes, such as AL vs. gap Appendix B for a 12 V, 15 W universal input power supply with and core loss curves. The catalogs for the manufacturers listed secondary regulation, using the step-by-step procedure in Appendix A supply basic electrical data for common US, developed in application note AN-16. It is assumed that the Asian, and European core types. For core sizes common to reader is already familiar with TOPSwitch and the fundamental several manufacturers, the electrical characteristics given by principles of flyback power supplies. This information can be one core manufacturer can be used for a core of the same found in the TOPSwitch data sheets, and application notes physical dimensions from another manufacturer. AN-14 and AN-16. More details on flyback transformer theory and design can be found in AN-17. Bobbin Manufacturer’s Catalogs Required Reference Materials: Bobbin manufacturers catalogs are used to provide mechanical