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[FAQ] PMP21462: What are the benefits of using UCC28742 (High-Efficiency Flyback Controller With Optocoupler Feedback) in the implementation of a “magnetically resistant” power reference design?

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Part Number: PMP21462

What are the benefits of using UCC28742 (High-Efficiency Flyback Controller With Optocoupler Feedback) in the implementation of a “magnetically resistant” power reference design?

  • The PMP21462 is a 12-Watt, Magnetically Resistant, Quasi-Resonant Flyback Reference Design. It is designed for wide input (90-490 Vac input) and accounts for variance due to an external magnet. In order to make this reference design work robustly across a variety of conditions, a discontinuous conduction mode (DCM) is desirable. DCM allows for a simpler control loop that can work across wide input range.

    The Quasi-Resonant operation allows the controller to operate in DCM by utilizing valley-switching to reduce switching losses. The UCC28742 (High-Efficiency Flyback Controller With Optocoupler Feedback) was chosen because it offers this quasi-resonant switching capability to implement low cost output rectifiers.

    To learn more about the performance of this reference design under typical and stress test conditions, refer to section 2 "Testing and Results" of the User Guide for PMP21462.

    You can also download the design files (BOM, Schematic, Gerber) for this reference design from the PMP21462 folder.

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