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Reference Design For A 35 W Wide Input Range Flyback Converter

Reference design for a 35W flyback converter that can take a wide range of AC input from 90-305 Vrms and provide a constant output of 48V.

The STEVAL-ILL069V2 is a power supply reference design based on flyback topology. The reference design can take input directly from AC mains and provide a stable DC output of 48V. The reference design can work from 90VAC -305VAC running at a frequency of 45 Hz – 66 Hz. The reference design can provide a maximum power of 35W with an efficiency of up to 90%. An auxiliary 16 V output is also present to supply small circuits which absorb a maximum current of 20 mA. The reference design has a compact size measuring just 130 mm x 50 mm and is ROHS compliant. The STEVAL-ILL069V2. The reference design features multiple safety features including output short circuit and overload protections and also comes with an auto-restart for safe operation in lighting environments. Due to its stable output voltage, the reference design is suitable as a LED power supply for displays and signboards, outdoor lighting, etc.

ST has tested this reference design. The company has also provided additional resources such as schematics, Gerber files, etc. You can find additional data about the reference design on the company’s website. To read more about this reference design click here.


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