Several software tools are available for designing Viper flyback converters, including:
is the winner. It provides a complete Bill of Materials (BOM) and schematic in minutes. Precision and Customization: viper flyback converter design software download better
Using a generic calculator, I got a transformer primary inductance of 2.2mH. Using eDesignSuite for the same VIPer122, it recommended —because the software accounted for the IC’s internal propagation delay (120ns). That delay changes the real peak current at high frequency. The generic tool missed it. The “better” tool caught it. Several software tools are available for designing Viper
If you are looking for with good reviews for VIPer flyback design, there is no current, well-reviewed downloadable tool. The best option is to use ST eDesignSuite online (works like software, but in browser). If you absolutely need offline, download LTspice + ST models – excellent reviews, but requires manual design effort. Using eDesignSuite for the same VIPer122, it recommended