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LMR14020-Q1: EMC problem failed in RE test

Part Number: LMR14020-Q1

Dear,

1.Firstly, failed in CE test, then customer add Buffer circuit follow the datasheet, add RC with Freewheeling diode, please refer the picture"Board".
2.Then CE test passed(refer to the picture"CE test result"),but RE test failed, customer add both Zerro Inductor and DM inductance follow the picture"Zerro Inductor".

3.Could you please tell me weather it work if add the R9 in picture"Add R9 to Improve RE test"? if it works, could you please give me a specifical value of R9?

4.Besides, Could you please help give me some advice about "Zerro Inductor/DM inductance/Buffer circuit RC/R9"? Specifical value to improve EMC RE test.