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LM25019: Isolation rating of this spec

Lauren Mayfield
Expert 6890 points
Part Number: LM25019
Other Parts Discussed in Thread: LM5019, TIDA-010006

This spec falls under the isolated flybuck converters line but I don't see any information regarding the isolation specs on the datasheet. Is it rated for 1.5kVrms or 3kVrms isolation?

  • 0
    TI__Mastermind 22299 points

    Hey again Lauren ,

    The isolation transformer on the LM5019 EVM is the same series, Coilcraft LPD5030V-154ME so it also has a 1.5kV isolation rating. You can also use a higher isolation transformer from the magnetics vendor.

    Are you specifically looking for 3kV isolation?

    -Orlando

  • 0 in reply to Orlando Murray
    TI__Expert 6890 points

    Hi Orlando,

    Yes, I need up to 3kVrms. This is for an auxiliary power supply in a grid infrastructure application (helping a customer find a part recommendation).

    Would you happen to have any other suggestions? Requirements are (including 3kVrms isolation) 2 W output, 12V-20 V input, 20V output, working voltage needs to be 50-60V, sometimes 600V (in a worst case scenario), and really needs to be pretty simple to design in. They have a preference for flybuck topology.

    If not then no worries I can keep looking. Really appreciate the help!

    Thanks,

    Lauren

  • 0 in reply to Lauren Mayfield
    TI__Mastermind 22299 points

    Hi Lauren,

    I found a decent isolation transformer, the Wurth 750343953 with 3.75kVAC isolation from TIDA-010006.

    https://www.we-online.de/katalog/datasheet/750343953.pdf

    I'm not sure what the working voltage is and the extra windings are unnecessary, but otherwise it will work in a Flybuck topology.

    I will look into my magnetics contacts and see if they have a better transformer and let you know,

    -Orlando