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Ferroxcube Dongguan have ISO/TS16949
UL file number change for epoxy coated ferrites

Effective 24 August 2010, all FERROXCUBE ferrite cores coated with epoxy are flame retardant in accordance with "UL 94V-0";
UL file number E 228348

UL file number E 235873 published in catalogue or other FERROXCUBE publications for part of epoxy coated ferrites should be now recognized as obsolete.
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UL file number change for nylon coated ferrites

Effective 1 August 2010, all FERROXCUBE ferrite cores coated with polyamide 11 (PA 11) are flame retardant in accordance with "UL 94V-0"; UL file number E 328173.

UL file numbers published in catalogue or other FERROXCUBE publications before August 2010 should be now recognized as obsolete.
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Ref design uses Ferroxcube E5.3 for gate-drive trafo

A guide to designing gate-drive transformers
In the January 2007 issue of Power Electronics Technology magazine, an article appeared that describes a step-by-step procedure for the design of gate-drive transformers. It optimizes the mechanical, thermal and electrical parameters of the transformer, leading finally to the bill of materials. A 5 W reference design operating at 300 kHz uses Ferroxcube core E5.3/2.7/2-3F3 and bobbin CPHS-E5.3/2-1S-6P-Z.

 

See the below link to the article of Patrick Scoggins, senior applications engineer, Datatronics Distribution, Romoland CA, USA :
A guide to designing gate-drive transformers (bill of materials on page 35)

Fig : The finished pulse transformer.

 
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