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Two switch flyback converter

In a two-switch flyback topology, a high-side power MOSFET – placed between the input voltage rail and the transformer – and snubber diode are added to help overcome the limitations of conventional flyback topology as the overall voltage stress is equally split between the two transistors.

Advantages of a two-switch configuration

This is particularly valuable in high-voltage applications such as auxiliary power supplies supplied by a three-phase input rail. A dual-switch flyback topology also removes clamping losses by recycling the leakage energy to the input side via the two diodes, thus boosting efficiency and reducing thermal stress while clamping the maximum voltage stress of the power MOSFET to the input voltage.

Our products and solutions

We offer a range of controllers supporting quasi-resonant mode, power MOSFETs, diodes and protection devices as well as a range of hardware and software development and evaluation tools to help design high-efficiency two transistor flyback AC-DC converters.

All tools & software

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      ST Diode Finder

      Active

      Diode product finder application for Android and iOS

      Finder Apps ST
      ST Diode Finder

      Description:

      Diode product finder application for Android and iOS

      ST Voltage Regulator Finder

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      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

      Finder Apps ST
      ST Voltage Regulator Finder

      Description:

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets

      STPOWER MOSFET Finder

      Active

      STPOWER MOSFET finder mobile app for tablets and smartphones

      Finder Apps ST
      STPOWER MOSFET Finder

      Description:

      STPOWER MOSFET finder mobile app for tablets and smartphones

All Hardware Evaluation Tools

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      STEVAL-DPSTPFC1

      Active

      3.6 kW Totem Pole PFC with inrush current limiter reference design using TN3050H-12WY and SCTW35N65G2V

      TN3050H-12WY Power supplies and converters ST
      STEVAL-DPSTPFC1
      Active

      3.6 kW Totem Pole PFC with inrush current limiter reference design using TN3050H-12WY and SCTW35N65G2V