what amount of ripple voltage is acceptable on input side of bus of flyback converter. Or is it ok if we use flyback converter without inserting cin bulk capacitor?
Sir , My input voltage range is 85-265ac and output is 20watts and 12 volts. So in this case can I ignore Cin?What amount of ripple is acceptable depends entirely on the application.
If your power source is AC and your required output is clean DC this is best done with an adequate Cin.
Your question is quite broad. Do you have a specific example?
can You please tell me the reason or any document on that?There are flyback LED drivers which operate on unregulated rectified AC, so 325V peak, with 325V of ripple.
Again it’s EN61000-3-2, which imposes stricter limits on harmonic currents from lighting.can You please tell me the reason or any document on that?