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FAN7530 PFC controller: Alternatives or UK suppliers

Discussion in 'Datasheets, Manuals or Parts' started by tomizett, Aug 15, 2016.

  1. tomizett

    tomizett Active Member

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    Hi all,
    I've got a board here with a dead PFC controller, a Fairchild FAN7530, which I need to replace.
    This seems to be unavailable from any of my usual UK suppliers (RS, Farnell) so I was wondering if anyone knows of an equivalent alternative or somewhere (other than eBay) where I might be able to buy one?

    For reference, I've been through the list of parts that RS do stock and none of the following appear to be a suitable drop-in replacement:
    NCP1654BD65R2G
    AP1662MTR
    NCP1608BDR2G
    MC33262DG
    NCP1611ADR2G
    L6562D
    L6562ADTR
    UCC28019AD
    ICE2PCS01G
    NCP1653DR2G
    IR1155SPBF
    IR1155STRPBF
    MC33262DR2G
    ICE2PCS02G
    L6562ATD
    MC34262DG
    NCP1653ADR2G
    UCC28019D
    IR1152SPBF
    TDA4863
    L6562DTR
    NCP1611BDR2G
    NCL30002DR2G
    AP1682MTR
    NCP1654BD133R2G
    L6562AD
    TDA4863
    MC33262DG
    MP44010HS


    Thanks for reading!
     
  2. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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    Here is why

    You will have to deal with the "new old stock" folks.
     
  3. tomizett

    tomizett Active Member

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    Thought as much... thanks!
    Doesn't look like it was a design that caught on.
     
  4. dave

    Dave New Member

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  5. spec

    spec Well-Known Member Most Helpful Member

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    Hy Tomizett,

    I think that the FAN7930: https://www.fairchildsemi.com/datasheets/FA/FAN7530.pdf is a direct replacement for the FAN7530: https://www.fairchildsemi.com/datasheets/FA/FAN7930B.pdf

    The FAN7930 is available from DigiKey for example: http://www.digikey.com/product-detail/en/fairchild-semiconductor/FAN7930BMX/FAN7930BMXCT-ND/3687190

    spec
     
    Last edited: Aug 15, 2016
  6. tomizett

    tomizett Active Member

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    Thanks spec.
    Close, but I don't think it's quite right (or am I missing something?). The 7530 uses pin 2 to set the slope of the internal ramp generator, whereas the 7930 uses it as the input to the over-voltage protection comparator.

    These Failchild parts seem to be a bit unusual in that they don't require a sensing network from the rectified mains - this seems to be related to what they describe as the "voltage-mode" rather than "current mode" control... I've not read the datasheet in enough depth to really understand this yet. Nevertheless, there are lots of parts which have a line-voltage sensing input on pin 3 and compensation on pin 2 - but irritatingly that's no help to me!

    <postscript>
    ...I suppose I could put in a 7930 and just leave OVP pulled low. As long as the oscillator was in the right range it should work...
     
  7. spec

    spec Well-Known Member Most Helpful Member

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    Oh dear, I missed that point, but I must admit that I didn't check every detail of the two chips.:)

    But your work-around should allow you to use a FAN7930.

    spec
     
    Last edited: Aug 15, 2016
  8. spec

    spec Well-Known Member Most Helpful Member

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  9. tomizett

    tomizett Active Member

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    It's starting to look like that might be the only option!

    Thanks for your input anyway.
     

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