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TPSF12C3-Q1: TPSF12C3 – Using Two AEF Loops on the Same Line?

Mert Eren Kandilli
Prodigy 71 points
Part Number: TPSF12C3-Q1
Other Parts Discussed in Thread: TPSF12C3

Tool/software:

Hi all,

I’m working on a high-power grid-connected AC/DC converter with a two-stage EMI filter at the input. I’m considering adding TPSF12C3 active EMI filters.

Idea: place two TPSF12C3 circuits in parallel on the same line, but configure their sense and inject pins differently so that:

  • AEF-A targets the lower frequency band (e.g. 150–500 kHz)

  • AEF-B targets the higher MHz region

Questions:

  1. Has anyone tried two AEF loops in parallel? Do they interact or risk instability?

  2. Besides adjusting sense/inject networks, are there other ways to shift the effective frequency band of the TPSF12C3?

Any experience would be much appreciated.

  • 0
    TI__Expert 5955 points

    Thanks for your question

    I will look into it and get back to you

    Thanks and Regards

    Naresh

  • 0 in reply to Naresh Adepu
    TI__Expert 5955 points

    Hello Mert

    We don't recommend two AEF loops in parallel. It hasn't been done before and also it risks stability. 

    There is no way to shift the frequency band of TPSF12C3. The IC is designed to work in 150kHz to ~2MHz region. It is recommended to use standard values of sense and inject networks. not recommended to change them. 

    Could you please share your input filter EMI schematic for us to evaluate and check if the device fits in.

    Also, what is the switching frequency and power level of your application?