FEATURES
EE EI -Low cost EFD EPC EER -Low profile -Large winding window area -Various bobbins for multiple output -Large cross sectional area -Relatively expensive Typical APPLICATIONS
Aux. power Battery charger LCD Monitor CRT monitor, C-TV DVDP, STB PQ Table 1. FEATURES
and typical applications of various cores Core size: Actually, the initial selection of the core is bound to be 2. General Transformer design procedure (1) Choose the proper core Core type : Ferrite is the most widely used core material for crude since there are too many variables. One way to select the proper core is to refer to the manufacture's core selection guide. If there is no proper reference, use the table 2 as a starting point. The core recommended in table 1 is typical for the universal input range, 67kHz switching frequency and 12V single output application. When the input voltage range is 195-265 Vac (European input range) or the switching frequency is higher than 67kHz, a smaller core can be used. For an application with low voltage and/or multiple outputs, usually a larger core should be used than recommended in the table.
Fairchild Semiconductor
