Basic circuit diagrams of SMPS

Datasheet as PDF

Principle circuit diagram



  • Simple construction and low cost
  • Only one inductive component
  • Several output voltages
  • Easy to adjust
  • Large transformer with air gap necessary
  • High eddy current losses in the area of the air gaps
  • High effort for interference suppression
  • Simple trigger electronics
  • Two inductive components necessary
  • Large output choke necessary
  • Several secondary voltages only with a lot of effort to adjust
  • Medium effort for interference suppression
  • Only a small choke necessary
  • Only a bit of interference suppression needed
  • Two inductive components necessary
  • Complex windings

Source: Prof. Kilgenstein

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