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Power ground and control ground

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alpachino10

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Hi,

I have a question on grounds in a circuit:

Should the power and control grounds be separated (isolated?) from one another in a power circuit (for example a buck converter)? What are the challenges and considerations of this matter?

I'd appreciate if someone could explain it. Thanks.
 

The main concern is the interaction between the power ground and the control ground. the strong current variation across the power ground would affect the control ground, and then the control loop. you can have one internal layer as the the power ground and make a small separated area in top layer as the control ground. Connect the control ground and the power ground through via.
 

I had hell's own trouble with grounding on an AC Induction motor drive I once designed which had active PFC front end. I ended up having to route the grounds from gate drives quite carefully in order not to screw up the processor and other control IC's on the board.
 

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