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No this is not what I meant.
The best way in my opinion to discuss about technical solution is to sketch a complete solution i.e. present a solution that starts from simple high level requirements such:
-Definition that is not depend on implementation.
-Unbalance requirement (current or resistance or else) is one number, worst case, specified in the UUT operating state/range
-Can be described by solid mathematical _expression_ or other logical way
-Easy to explain
-Easy to test
I'll try to show one example for PSE if I'll have time for Thursday meeting. If not, we will have time on IEEE week.
Meanwhile consider the following EXAMPLE:
Use case #1: PD is single load. (we need to check other use cases and generate set of requirements that doesn’t contradict each other. It is possible if we replace ideas with mathematical expressions so we can plug there physical limitations, backward compatibility considerations that can be described by numbers etc.)
1. PD is brought to ON state
2. PD operating input voltage is 36 to 57.
3. PD min- max total load current (Itotal) is 10mA to TBD
4. The specification will say the worst case PD PI Pair to Pair DC input resistance is e.g. 15%. (please note that in single load PD, Iunb=P2PRUNB*Itotal.
This is the responsibility of the PD vendor to make sure that he doesn’t cross his P2PRUNB no matter where this point is on his P2PRUNB curve so it doesn't matter if it is linear curve or other .
THE PD PI P2PRUNB is number that is derived from End to End Channel Resistance number that we define what we want it to be to optimize
cost of the entire system component. Same PSE PI P2PRUNB.
5. Etc. continue until there is clear solution. I guess we all know what we want. We just need to bring complete solution so we can discuss it.
I'll try to follow this concept and see if I can have something solid for discussion.
On 5/7/2014 3:45 PM, Darshan, Yair wrote:
Hi Ken,Thanks. See my comments up to page 5 due to lake of time.We can discuss more at the IEEE meeting.Yair