The paragraph that i marked yellow color. The author mention about that:
From the calculate: lgap = 17 mils why the author select standard gap for this core 67mils with an AL of 100mH/1000T?
Reference : Power Supply Cookbook, Second Edition By Marty Brown
I have read a great document that the author of the forum shared it. But only (part I) can search this document and who can share it for me. Thanks you
so much