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Original question:

PMP21516: Need transformer detailed SPEC of this design

PMP21516: EMI Filter Design

Michael Black2
Intellectual 340 points
Part Number: PMP21516

Hello,

I am trying to learn about EMI input filter design, and I was wondering if there were any resources offered by TI that give a comprehensive guide to designing EMI input filters?

My current understanding is that the input filters are designed per their application (i.e. automotive, industrial, personal electronics, etc.), and there are compliance standards for each industry which determine

the component values (common-mode choke inductance, x-cap/y-cap capacitance).

So basically I think it is supposed to go like this:

Choose application --> Review that application's compliance standards --> design a filter to ensure EMI compliance is met

I mentioned the PMP21516 specifically because I am currently working on a 24V, 120W power supply for a personal electronics application. I would like to know how they arrived at the component values for their EMI input filter.

Best, 

  • 0
    TI__Intellectual 780 points

    Hi Michael,

    Yes, your general approach of starting with the compliance standards in mind is a good way to attack the problem. Start with the end in mind.

    There are many resources you may find helpful in your input filter design. You could start by looking at some of the papers/presentations published as part of the Power Supply Design Seminar:  

    You can sort Topic by "System Level Considerations" and several EMI topics will come up.

    There are also a number of training videos related to EMI that you can find on  . I suggest searching for "EMI" and looking through some of the videos there. This series in particular may be helpful: