This application note explains the key steps in designing two of the most important components in a flyback converter – the transformer and the snubber resistor. Flyback converters are very popular topologies in a variety of segments, both in DC/DC and offline (50 Hz, 120 V or 230 V input) circuits.
However, this application note will demonstrate that flyback converters can generate losses, especially if the transformer is not designed properly. It is not common to see flybacks operating at higher than 100 W of power due to the losses in the transformer. Other topologies can achieve higher efficiencies. Power supplies of up to 100 W cover many consumer and automotive applications such as appliance control boards, LED drivers and many more.