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Thread: Please, take a look at this TL494 power supply, is everything OK?

  1. #1
    diysmps Member
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    Please, take a look at this TL494 power supply, is everything OK?

    Hello!

    It happened, that I once bought 10 TL494 chips, hoping one day to make some SMPS. But unfortunately I'm unable to find a trustworthy schematic for it. The biggest problem is to find a circuit for a gate drive transformer part. So many variations, but almost none for driving mosfets.
    After looking through some hundred circuits and getting more and more confused I took these two for samples: AC-DC converter SG3525 Full Bridge.jpg not sure, but most likely from this site; and 15-48V SMPS Full.GIF from here.
    So I tried to combine them together, and this is the result: SMPS_494.GIF.

    Please, share your thoughts, criticism and suggestions about my creation.

    Thank you very much.
    Last edited by OhMy; 05-20-2014 at 06:59 PM.

  2. #2
    diysmps Member
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    Yep................................

    Sad

  3. #3
    Your combined schematic should just work fine, Its impossible for any one to know if it will work 100% or not, but all seems OK to me, specially the 15-48V 16A design, because its 100% working design.

    And to make things clear, HYPEX uses almost the same techniques + TL494 in there SMPS. very close to the circuits you have just shown.

    So I think it would be a good idea to start your testings, and you will discover everything you are looking for.


    Regards
    www.diysmps.com & www.Micro-Audio.com

  4. #4
    diysmps Member
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    OK, Microsim, thank you for the replay.
    I actually already made a PCB for the combined circuit SMPS_494_PCB.GIF, but it doesn't work- the 494 doesn't even want to oscillate. Could it be something to do with the open inputs of the second internal comparator (pins 15 + 16)?


    P.S. Some posts got lost somewhere ...
    Last edited by OhMy; 05-24-2014 at 12:45 PM.

  5. #5
    See below circuit, and compare with it, this is used for an unregulated SMPS, so at lease it will guide you to know whats going on


    Untitled.jpgUntitled.jpg
    www.diysmps.com & www.Micro-Audio.com

  6. #6
    diysmps Member
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    Thanks for the samples, but they appear too small to see details.

  7. #7
    copy my TL494 schematics if you need half bridge I have just rebuilt it and it works straight. there is no regulation for the time being. you just need to adjust the turns for your core Ae and Bmax. I even tried one of your schematics you posted and fel into some issues: http://www.diysmps.com/forums/showth...+signal+issues if you need bootstrap startup you fill it inside here http://www.diysmps.com/forums/showth...ed-half-bridge

  8. #8
    diysmps Member
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    Thank you, zeus_threat. I'll try to "digest" those threads.

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