Design Support Tools Use our suite of tools to help select, analyze and compare inductors Parametric Search View our list of inductors and filter results based on your exact parameters Looking for a datasheet? Search by product and download a PDF FREE Samples Get free samples quickly - most orders ship the same day! Looking for a datasheet? Search by product and download a PDF. Student Support Learn more about magnetics, request free samples or ask our engineers a question. Compact Transformers for No-opto Flyback Topology 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. 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. No-opto Isolated Flyback Converters Controllers for no-opto flyback topology isolated converters are offered by several major IC manufacturers and are becoming increasingly popular for wide-range input-voltage, low-power, isolated converters across a variety of applications. IC Manufacturer Low DCR High efficiency Low cost Selecting the proper off-the-shelf transformer can be completed in three easy steps: Determine turns ratio Calculate minimum primary inductance Calculate primary peak current Simply identify the target Lp, Np/Ns, and Isat, and request a sample from the individual product page links below. Output Power Input Voltage Copyright 2026, Coilcraft, Inc. Taiwan +886 2-2264 3646 We value your privacy We use essential and non-essential cookies on our Site, including third party advertising cookies to provide tailored ads. For more details or to manage your preferences, please see our Privacy Policy