line filter/choke

Hi zahra,

The input choke on a flyback converter is part of the input filter that filters out EMI. Usually on designing the filter, you start by making a simple low pass filter then iterate the values to achieve your desired response. You can use this reference from the internet for your filter design

http://www.ieca-inc.com/images/Conducted_EMI_filter_design.pdf

Hi,
thanks for your help.