aux_se_flyback_dc_in
Single-end Flyback with RCD snubber (DC input version)
Description
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.
Overview
An overview of relevant components, power class and topologies is shown in below table.
Circuit
Key Products
| Product Category | Product family | Product Number | Remark |
|---|---|---|---|
| Controller | QR | BM1Q021FJ | Linear type, fsw＜120kHz |
| QR | BM1P061FJ /BM1P101FJ | Gate clamper, fsw=65kHz /100kHz | |
| QR | BM1P10CFJ | Gate clamper, Low power mode, X-cap. Discharge, fsw= 100kHz | |
| Discrete MOSFET | 600 / 650V SJ MOS | R60xxKN / R65xxKN | Good compromise between performance and ease of use. |
| Diode (D1) Secondary Rectifier |
Schottky Barrier Diodes | RBQ /RBxx8 series | Ultra low IR SBD is suitable for rectification purpose, RBxx8 series has wide range of voltage choise |
| Diode (Ds) Snubber |
800V Si FRD | RFS series | Lower Vf than RSV series, but ultra fast switching capability |
Simulation
C-010. DC-DC Flyback Converter Vin=800V, Vo=25V, Io=10A