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Planar transformers

Discussion in 'Electronic Design' started by Tim Williams, Jan 8, 2012.

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  1. Tim Williams

    Tim Williams Guest

    Use 'em much? How does your experience compare with regular components,
    in regards to anything that might've caught your attention: performance,
    area, effective cost, etc.

    Any opinions on design tools for them? I'm guessing most EDA packages
    don't have this, though many will support the structures (e.g., Altium
    lets me declare a net bridge and put whatever funky copper I want between
    pads, which would work well for printed RF components as well).

    Anyone tried building them in two-sided PCBs? It occurs to me, to get any
    isolation clearance, the layout must extend pretty far beyond the core,
    which is going to do interesting things to leakage and EMI.


  2. I've not used them in my own designs, but I've used plenty of DC/DC
    converter modules that do, and they all have multi-layer PCBs. Power is
    in the range 50-200W, PCB thickness is usually 2-3mm (to fill the core),
    and the layer count is often 10 or more. There are no tracks on outer
    layers in the vicinity of the core.

    I don't think two sided will cut it, because of leakage inductance and
    clearance. YMMV.

  3. P E Schoen

    P E Schoen Guest

    "Tim Williams" wrote in message
    I've never used them, but I can recommend a company in NJ that does a good
    job at reasonable cost for EI core transformers, and they seem to have
    expertise in planar designs. Talk to Simon and tell him I sent you :)

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