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TPSF12C1-Q1: TPSF12C1-Q1 bias supply implementation

Andreas Ely
Prodigy 10 points

Part Number: TPSF12C1-Q1
Other Parts Discussed in Thread: TPSF12C1

Hi

Does TI have any recommondations for how to best implement the 12V chassis refered supply that powers the TPSF12C1-Q1?

 

The application in questions is the use of the TPSF12C1-Q1 in a input filter for a 265->85VAC ACDC.

Creating a chassis refered power supply raises leackage and safty concerns on our side.

To be able to certify as a CE approved device the device can not leak more than 3.5mA into chassis from the L,N.

I assume some kind of galvanic isolation is also required? if so what voltage rating would the galvanic isolation need to meet.

 

Thanks,

Andreas

  • +1
    TI__Mastermind 18100 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__Mastermind 18100 points

    Hi Andreas

    Thanks for the detailed question about using TPSF12C1‑Q1 in your 265–85 VAC input filter. For TPSF12C1‑Q1 the bias rail is intended to be a low‑noise 8-16 V supply referenced to chassis/PE, with 12 V nominal and tight ripple, as described in the datasheet and EVM user guide. Any leakage current and safety compliance (for example the 3.5 mA CE limit) must be managed at the system level by the choice and placement of Y‑capacitors and the isolation barrier of the front‑end ACDC stage. TI does not currently provide a dedicated reference design for a chassis‑referenced 12 V bias supply for TPSF12C1‑Q1, so the exact implementation (isolated vs non‑isolated, insulation rating, and leakage budget) needs to follow your safety standard, insulation coordination analysis, and test‑lab guidance


    In parallel, this device is undergoing additional internal evaluation due to sensitivity and robustness challenges in some applications, so it is not being recommended for new designs at this time. For a new project that requires common‑mode EMI attenuation, the safer path is to either stay with a purely passive EMI filter or consider other alternative approaches while TI’s investigations are completed.

    Thanks and Regards

    Naresh

  • 0 in reply to Naresh Adepu
    Prodigy 10 points

    Alright, Thanks.

     

    Is there a way to receive any updates on the internal evaluation?

     

    Regards,

    Andreas

  • 0 in reply to Andreas Ely
    TI__Mastermind 18100 points

    Hi Andreas

    Thanks for your question, we will get back to you

    Thanks

  • +1 in reply to Naresh Adepu
    TI__Mastermind 18100 points

    Hi Andreas,

    The internal evaluation is not handed over to a different team. The marketing team will reach out to you in the future when the evaluation is complete.

    Thanks for your patience. I am closing the thread for now

    Thanks and Regards

    naresh