RCD clamp & Flyback converter

[salviador]

Hi,

I'm repairing a Flyback converter power supply.
I have a low output voltage and low out power! (this is the problem)

I find the capacitor of RCD clamp is damaged.
It must be of 470pF and instead I measure 380pF

My question is,
When it is important this capacitor? (only it serves for suppress Voltage Transient Spikes), but if capacitor is damaged the output voltage of power supply, It may be affected?

Example RCD Clamp:

[Richard Head]

Salviador
They are normally pulse grade capacitors. The dielectric is normally polypropylene (low loss dielectric) and the capacitor type FKP1.
For small little flyback converters (<100W) you can get away with different dielectrics but they aren't the optimum type.
Several manufacturers make FKP1 caps including Wima, Epcos etc.
The snubber shouldn't affect the output regulation at all unless it's about to self-destruct.
Dick