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Adding 68µH inductor before EMI filter at input

Thread Summary

The user asked if adding a 68μH inductor (SRN4018BTA-680M) before the EMI filter on the LT8650S demo board (DC2407A) is recommended to reduce conducted emissions. The final answer suggests using a CLC pi filter for EMI suppression and recommends designing the filter with LTPowerCAD to visualize conducted EMI. Experiments by the user found that adding a large inductor at the input made the LT8650S unstable and had no effect on EMC improvement.
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Category: Datasheet/Specs
Product Number: LT8650S

Hello,

In order to reduce conducted emission is it recommended to place a 68µH inductor (SRN4018BTA-680M) before EMI filter mentioned in (DC2407A) at the input voltage? 

the switching frequency of LT8650S is 2Mhz and by which a CAN interface will be powered.

Thank you!

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