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UC3845: UC3845

Adarsh Kumar
Prodigy 80 points
Part Number: UC3845

How to fix the fluctuation in output voltage.

  • 0
    TI__Expert 7900 points

    You need to supply more information about the application.  A schematic and 2-3 'scope pictures would be nice to start.  Also, exactly when does the fluctuation occur?

  • 0
    TI__Expert 7900 points

    Hi Adarsh,

    How is the UC3845 being used:  buck, boost, flyback?  What are the Vin, Vout, and Iout conditions?  A "fluctuation" is too vague of a description.  It could be caused by poor loop compensation, transformer saturation, pulse-by-pulse current limiting, incorrect HV startup components, etc.  If you don't supply a schematic, 'scope picture, or description of when this occurs there's no way to accurately provide a resolution.

    Regards,

    Eric

  • 0
    TI__Expert 7900 points

    Hello again Adarsh,

    Have you used TI's WEBENCH designer?  Find the online tool here.

    Enter UC3845 in the Part Number field.

    Enter your Vin, Vout, and Iout requirements.

    The WEBENCH tool will generate a very nice design report for you.  You can EXPORT the design report and Print (to a PDF file).

    COMPARE your existing schematic to the one generated by WEBENCH.  This should get you on track to resolving the "fluctuation".

    Regards,

    Eric