I am designing a smart plug. In which is used a power IC- TinySwitch III. Attached is the screenshot of the design used.
Now I need to place a common mode choke in the design.
I am planning on placing the common mode choke before the bridge rectifier section where the green circle is in the screenshot.
Please help with the design of a common mode choke. What should the impedance and frequency and the inductance of the choke be? if the input current is 20mA.
What kind of core would be efficient in reducing noise?