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The single-switch forward converter represents a valid alternative to the single-switch flyback topology in isolated, off-line, step-down converters with high output current requiring galvanic isolation in the 100 to 300 W power range.

Unlike flyback converters, in a forward converter energy transfers instantly to the transformer and does not rely on it for energy storage. Transformers can thus have higher magnetizing inductance and no air gap, providing better transformer utilization.

The transformer’s secondary output is then L-C filtered to ensure lower output voltage ripple while peak current – and thus stress – on the active transistor is reduced.

On the flip side, compared to a flyback topology, the transformer must be reset after a few cycles to avoid saturation. In this case, a higher voltage rating for the primary power MOSFET, an extra output inductor and a freewheeling diode are needed.

We have a complete offer of primary-side PWM and synchronous rectification controllers, power MOSFETs and diodes together with a range of hardware and software evaluation and development tools including reference designs to help developers design high-efficiency, size optimized forward converters.

Forward converter block diagram

All tools & software

    • Part number
      Status
      Description
      Type
      Supplier

      ST Voltage Regulator Finder

      Active

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

      Finders Apps ST

      STPOWER MOSFET Finder

      Active

      STPOWER MOSFET finder mobile app for tablets and smartphones

      Finders Apps ST
      ST Voltage Regulator Finder

      Description:

      Linear and switching voltage regulators and voltage reference applications for smartphones and tablets
      STPOWER MOSFET Finder

      Description:

      STPOWER MOSFET finder mobile app for tablets and smartphones

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output

V This option is required and must be a number.
A This option is required and must be a number.