transformer winding sequence
My application uses the bias winding also as the main output power winding (12W) w/ the feedback connected to it. There is also an isolated output rated at about (3W) power. When using shield and cancellation windings, what is the best winding order to miniminize leakage inductance, keeping in mind that the isolated winding needs 3750vac isolation from all other windings? Thanks
Comments
I have a design using Linkswitch-II. One of your documents (DER-207) show the shield connecting to the positive primary rail and others (data sheet, RDR-158, AN-44, DI-159 ) connecting to the negative rail. Your PIXI Designer software has given me a transformer design with the shield connecting to the positive rail.
Why is there this difference? Is it important?
Positive rail is generally preffered since the winding noise source that is being cancelled is the primary winding, which is referenced to positive rail
AN44 -- pages 12-14 shows sequence and how to optimize. This technique will work for any of our products in flyback application
http://www.powerint.com/sites/default/files/product-docs/an44.pdf