Snubber Circuit Flyback. Where fs is the switching frequency of the flyback converter. For example the resistor capacitor diode rcd snubber the key element of a flyback converter requires solid calculation and experiment verification to figure out the optimum parameters.
The overshoot on the transistor voltage is due to the leakage inductance of the transformer. And it also is common to see both as shown in figure 1 above. The resistor pro vides damping for the lc resonance of the power cir cuit and the series capacitor prevents the voltages at the power stage switching frequency from being applied across the resistor.
Vsn should be 2 2 5 times of nvo.
However there are special cases when a snubber circuit is not needed resulting in an even more simplified schematic and a smaller solution footprint. It is common to see either the zener diode clamp or the rc snubber used in a flyback circuit. The flyback topology figure 1a results in significant cost and space savings for multiple output power supplies with high output voltage for power levels up to 100w. And it also is common to see both as shown in figure 1 above.
