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The "no-opto" flyback topology enables primary‑side regulation by deriving the isolated output voltage directly from the primary-side flyback waveform. This provides an isolated flyback without the need for an extra transformer winding—or opto coupler—to provide feedback across the isolation barrier from secondary side to primary side.

no-opto.png

Without the feedback winding, transformers may be designed for optimal coupling, best efficiency, smallest size and lowest cost. Coilcraft offers a variety of off-the-shelf transformers that have been optimized for these converters and designed for the most common output voltages and output power up to 24 Watts.