Isolation capacitor in an isolated DC DC converter

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peatear

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Hello,

I'm laying out an isolated DC DC converter and I have a question.

Do I need an isolation capacitor between the two ground planes? Will it make a difference if I am using an optocoupler or a transformer as my isolation feedback?

Thank you!
 

The capacitor across the isolation barrier (also called Y-capacitor) has the purpose of reducing high frequent interferences. It's not functionally required.
The feedback signal need to be DC coupled, so it can be easily transmitted with an optocoupler. A transformer needs a modulation circuit.
 
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    tpetar

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Keep in mind you can't just use any cap, look up X and Y ratings for mains and safety related caps
 

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