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Please my response below.
Referring to the picture on page 7, if the ground of the loads is the same, there is current sharing between the return lines (in blue).
Yair: Correct but only on the return path as I showed.
So even if the loads are different, the current on the return path is balanced, and may be higher then expected on the pairset with lower class.
Yair: I guess you meant that the current is unbalanced etc. That is why this it has to meet Icon-2P_unb as I mentioned in slide 7 the blue text and also in the summary slides 8 and 9.
So, if there is a common point between the pairs in the PD the two classes must be the same.
Yair: I disagree. The class has to be the same only if there are two common points because only in this case there is a single load. If there is only one common path it is not a single load. Look that the positive path is isolated by the DC/DC components.
The case were both positive and negative path has common path are described in Figure 1, Figure 2b and Figure 3b.
Do you agree with that?
Yair: Please see above.
I was asked to do this for Katania meeting.
Please let me know if you have comments/questions etc.
Chief R&D Engineer
Analog Mixed Signal Group
1 Hanagar St., P.O. Box 7220