Single-end Flyback with RCD snubber (AC/DC IC 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 |
|---|---|---|---|
| AC/DC IC | Integrated PWM controller with built-in Si MOSFET | BM2P101FK-LBZ | ＜20W DIP7 Package Brown Out for SEMI F47 AC Dip requirement |
| Integrated PWM controller with built-in 730V Si MOSFET | BM2P060MF-Z | ＜50W No need of heat sink, Discharge resistor, X-cap, all in one package | |
| 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 (D1) 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