yeap stupid of me sorry. Writing a review and responding on the same time in technical matters isn't the best way to do it. It is indeed 1 A. I still cannot understand how I messed with Ohm's law
You keep mentioning flyback PSU. This isn't the case here unless you mean flyback otherwise. According to Maniktala in a pure flyback topology all the energy transferred from the input to the output must have been previously stored in the inductor(s),
In the main transformer indeed the signal isn't pure sine but still isn't perfect square or triangular. It depends on the switching speed of the main switchers.
Good reads on this subject.
1) Gordon McComb and Earl Boysen: Electronics for Dummies. Wiley Publishing, 2005 (ISBN 0-7645-7660-7)
2) Keith H. Billings: Switchmode Power Supply Handbook. McGraw-Hill, 1989 (ISBN 0-07-005330-8)
3) Marty Brown: Power Supply Cookbook. Newnes, 2001. (ISBN 0-7506-7329-X)
4) Marty Brown: Practical Switching Supply Design. Academic Press, 1990. (ISBN 0-12-137030-5)
5) Switch-Mode Power Supply Reference Manual, On Semiconductor, Rev.4, 2014
6) Sanjaya Maniktala: Switching Power Supplies from A to Z. Newnes, 2006. (ISBN 0-7506-7970-0)
7) Sanjaya Maniktala: Switching Power Supplies from A to Z Second Edition. Newnes, 2012. (ISBN 978-0-12-386533-5)
I have most of them in hard copies and the last one is just perfect. But it needs a deep electronics background in order to follow it.