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福邹000's avatar
福邹000
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6 years ago

How to avoid EMI problem when we use EN5339QI to transfer 5V to 3.3V.

Hi all, We are using EN5339QI and EN5319QI in many of our projects.The current of EN5319QI is about 200mA,and the current of EN5339QI is about 3A.When we did EMI test,we found that the radiation at ...
Mostafa_Intel_AE's avatar
Mostafa_Intel_AE
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6 years ago

Hello,

Please correct me if i am wrong, you mean the radiation near EN5339 is higher than EN5319, if so that make sense where EN5339 has higher current and lower internal inductor.

You will need to add a bead in the input side between the input capacitors and the input voltage supply to reduce the current noise on the input line.

Regards,

Mostafa

福邹000's avatar
福邹000
Icon for New Contributor rankNew Contributor
6 years ago
Dear MOSTAFA, Thank you for answering my question. Your answer let me know how to design next, I will add a bead in the input side and do some experiments. Many thanks for your help.