LM25118: EMI problem with LM25118

hongwei duan

Part Number: LM25118

Hello, my project used LM25118 to encounter some problems when it was over-radiated. I would like to consult, how can I facilitate radiation? Does TI have any suggestions in this regard? My input is 15V, the output is 12V. When the battery is only 9V, the minimum is 9V. When the radiation is at 198m, I encounter 80db. I would like to ask how to adjust.

over 6 years ago

0 Richard Fu22 over 6 years ago

TI__Mastermind 31105 points

Hello,

To handle radiation, I would consider taking a look at the layout and to minimize loop area around high di/dt areas, such as your switch node. Section 10.1 of the datasheet has available layout guidelines. Additionally, I would refer to the following resources for additional guidance:

http://www.ti.com/lit/an/slyt682/slyt682.pdf and http://www.ti.com/lit/an/snva489c/snva489c.pdf

The 1st resource shows important loops in a buck converter, which is similar to your situation. The 2nd resource discusses using a differential mode EMI filter to reduce conducted noise.

I hope you will find this helpful.

Best Regards,

Richard

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LM25118: EMI problem with LM25118