Single-end Flyback with RCD snubber (Controller IC version)
Flyback topologies are the most common and widely used topologies in auxiliary power supply design. Fly-back converter could be single phase as well as three phase types. Fly- back is most commonly used due to its simplicity in design and control, less components, low cost solution, and built-in galvanic isolation.
Single end fly-back is typically used for the power supplies < 250W.
An overview of relevant components, power class and topologies is shown in below table.
|Linear type, fsw＜120kHz
|Gate clamper, fsw=65kHz /100kHz
|Gate clamper, Low power mode, X-cap. Discharge, fsw= 100kHz
|600 / 650V SJ MOS
|Good compromise between performance and ease of use.
|Schottky Barrier Diodes
|RBQ series/RBxx8 series
|Ultra low IR SBD is suitable for rectification purpose, RBxx8 series has wide range of voltage choise
|800V Si FRD
|Lower Vf than RSV series, but ultra fast switching capability