Help required

Discussion in 'General Electronics Chat' started by xyz9915, Oct 7, 2008.

  1. xyz9915

    Thread Starter Member

    Feb 24, 2008
    23
    0
    Hi, the attachment is a schematic of SMPS built using IC TL494. The problem is that the capacitors C4,C5 get to much hot under full load. please guide what to do?
     
  2. scubasteve_911

    Senior Member

    Dec 27, 2007
    1,202
    1
    This is because your ripple current is joule heating the capacitors.

    Ensure your capacitors are meant for use in switching converters. They should specify the maximum allowable ripple current. For a quick fix, you can add in a couple more parallel caps. Did you have a bill of materials for this schematic?, or did you sub in many of your own parts?

    Steve
     
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