![]() ![]() I am attaching my Circuit as made in PI Expert here (both, UDS file as well as a PDF file), for reference. Can you please have a look and suggest a choke that is in the uH range (thus smaller size) AND associated components for EMI filtering ? This leads me to think that there can be other possibilities apart from the 6mH CM-Choke suggested by the PI Expert. And yet it failed CE conducted emissions testing, then we later used a 15uH (micro-Henry) CM-Choke with appropriate caps to just meet the CE requirements. I have done another design previously with a TNY284 chip, and a similar high-value Inductor was suggested (PI Filter) - i think it was a 1mH one. The CM-Choke alone increases the height / width by a magnitude. My design is supposed to be a very compact PSU, almost like a module, to be used in a custom consumer electronics device. I selected a Common-mode EMI filter, and the PI Expert software suggests a 6 milli-Henry CM Choke. ![]() Isolated, with TL431 and Opto-coupler feedback. ![]() I designed a circuit in PI Expert with following specs : ![]()
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