Universal Input, 12 V, 12 mA Constant Voltage Power Supply Using LNK304

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I'm using the design shown in figure 5 in the data sheet for the LNK302/304-306 LinkSwitch-TN Family.
How do I determine/calculate the voltage across the bypass capacitor C1 and the feedback capacitor C2, I need to document/prove that the components chosen are rated correctly.

I have used the PIXIs Designer to determine the component values and the design works perfectly, but as i indicated above, just need to prove that voltage ratings for the capacitors are sufficient.

Please advice.