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  1. #1
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    Unstable flyback SMPS

    Hello,

    I am trying to stabilise the isolated output voltage of this flyback converter.

    SCHEMATIC
    http://i54.tinypic.com/3162lpw.jpg

    It is 5V, 20W at the output.
    (Its in CCM)
    (it has been arranged to be in Voltage Mode, by a ramp being interfaced to the current sense input of the LT1243)

    The input voltage will be 30V to 48V

    I canít seem to stabilise it, and it takes a long time to run.

    Can you please help me to get it to run quicker so that I can adjust the feedback components and see if it stabilises?

    or help me with stabilisation?


    LTSpice simulation file:-

    2shared - download flyback 5v _30-48Vin.asc

    LTSpice free download page:
    Linear]Linear Technology - Design Simulation and Device Models Technology - Design Simulation and Device Models
    Last edited by grizedale; 22nd June 2011 at 15:21. Reason: missing picture

    •   Alt22nd June 2011, 15:14

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  2. #2
    Advanced Member level 3
    Points: 3,812, Level: 14

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    Re: Unstable flyback SMPS

    Hi

    sorry, i had made a mistake with connection
    -the problem is solved



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