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Tritan 09110-01214- SMPS without controller

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    #1

    Tritan 09110-01214- SMPS without controller

    Hi all,

    Got a few of these PSU for repair.
    similar fault blown IRF840 and main fuse.

    im trying to understand how is the gate signal created without any IC controller.

    anyone can share a general schematic i can follow to TS?

    i replaced the IRF and fuse, when connected with series lamp no problems.
    but maybe i got fake mosfets because with direct connection it blew and took few more components on the way.
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    #2
    It looks like it might be a discontinuous flyback design. If my guess is correct, VR1 (TO-92 package), located a bit above T2 in your picture, might be a TL-431. While this is nominally a programmable reference IC, it can also be used as a comparator with a reference on one input, and through an opto-isolator or transformer (T2?) to turn of the switch device. Thus a TL-431 (or TL-430) can be the controller.

    I don't have a schematic, but if the switch is not turned off, it might remain on long enough for the main transformer core to saturate, blowing the IRF840 and input fuse.
    PeteS in CA

    Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
    ****************************
    To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
    ****************************

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      #3
      Originally posted by PeteS in CA View Post
      It looks like it might be a discontinuous flyback design. If my guess is correct, VR1 (TO-92 package), located a bit above T2 in your picture, might be a TL-431. While this is nominally a programmable reference IC, it can also be used as a comparator with a reference on one input, and through an opto-isolator or transformer (T2?) to turn of the switch device. Thus a TL-431 (or TL-430) can be the controller.

      I don't have a schematic, but if the switch is not turned off, it might remain on long enough for the main transformer core to saturate, blowing the IRF840 and input fuse.
      Thanks for the fast reply,

      Q02= MPSW01A036
      https://www.onsemi.com/download/data...f/mpsw01-d.pdf

      Seems shorted- will order now

      VR1=TL431- i will create a test circuit to test it and report back.
      any recommendations on sourcing the parts i need? (dont really trust Aliexpress)

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