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X Capacitor - When use them

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berni80

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Hi,

I'm designing a 5W AC/DC from 230V to 12V.

I'm a bit confused about X Safety Caps and when/where I need to use them.

In the attached image (from https://www.onsemi.com/pub_link/Collateral/AND8132-D.PDF) they use an X2 caps at the input and then normal caps (E1 and E2) after the
bridge.

Is this approach correct? Why I do not need also E1/E2 as safety caps?

If E1/E2 fail the result is very similar to a failure of the input cap.

Is there any standard related to their use?

Thanks!
 

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