How add new transformer core details in to PI xls or PI expert library

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Hi,                                                                                                                                                                                                                                            When we try to design flyback DCDC converter using DPA switch in that transformer selection option, there is no custom core which is available in spread sheet of TOPswitch & other switch family which help us to use new transformer core by selecting custom core by entering core details required for PI design tool. Since I tried to design 2.5W DCDC converter with input range 36-72vdc & o/p of 5v/0.25mA for energymeter application using DPA423PN & EE16 core. But I designed using EFD15 core it works well but due to size issue it is held. So please help me out to upgrade the tool.             thanks & regards,                                                                                                                                                                                                                 mohan


Thank you very much for providing the information.