CONTENTS Introduction............... TDK Ferrite Cores in Switching Power Supplies........ Selected Items of Legend....... Material Characteristics .......... 3 4 5 6 PART I E Cores ............. EI Cores............. EE and EF Cores............. EE and EI Bobbins........... EER Cores................ EER Bobbins ............ ETD and EC Cores .......... ETD and EC Bobbins.............. Original TDK Cores........ PQ Cores........... PQ Bobbins............... LP Cores and Bobbins............ EPC Cores................ EPC Bobbins and Accessories...... EP Cores and Bobbins .......