Circuit design of 13W, universal input DVD power supply with no-load power consumption of 70mW

Summary:

Way of working

TOPSwitch-GX uses current mode feedback to achieve very low no-load power consumption. C16, R1 and Q2 provide a constant current to the TOPSwitch-GX control pin. R2 feeds the residual current of Q2 to the M pin. The increase in the feed current reduces the current limit of the TOPSwitch-GX.

design feature

  • High efficiency multi-output flyback power supply (minimum 77%)
  • Topology solutions enable design upgrades for higher power applications
  • Excellent cross adjustment rate
  • Very low no-load power consumption <70 mW
  • A small transformer can be used for the 132 kHz switching frequency
  • Frequency jittering eliminates common mode EMI filters
  • The CISPR22-B conducted EMI limit is met when the output is connected to the “fake hand” and has a >10 dB margin

DVD player power supply schematic using TOPSwitch-GX

See the PDF document for details (click on the PDF file to download)

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