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Thread: Resonant SMPS using L6599

  1. #11
    diysmps Senior Member res_smps's Avatar
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    Oct 2012
    Location
    bandung, indonesia
    Posts
    100
    Thanks for the advice, fake chips are our main problem because most components are imported from china
    Previously I also bought L6599A from a local shop that could not be used and the markings faded / disappeared when rubbed using cleaning liquid

  2. #12
    diysmps Senior Member res_smps's Avatar
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    Oct 2012
    Location
    bandung, indonesia
    Posts
    100
    I tried a new chip on a new pcb but it didn't work either.
    finally I tried using the old pcb design and it could function well.
    so it seems the problem is in pcb design.
    I choose to be conservative, I will make a new pcb based on this old pcb with improvements:
    - the addition of more secondary capacitors
    - Improved EMI filter design

    today I tried it on an amplifier
    https://youtu.be/IxDuTM91zeM
    I have a SMPS capable of 1000W, an amplifier capable of 250 to 400W.
    but I only use it for less than 50W, hahaha ...

    by the way I got this original chip at half the price of a fake one

    chip2.jpgchip1.jpgtransistor driver.jpgold design.jpg

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