Hi, Just updated latest 5.6V Zener experimental results: http://en.qi-hardware.com/wiki/Protection_of_Reversed_Polarity_on_DC_plug-in#Sch._D-1
When input is: 1), 4.75~5.25V: the voltage of "5V" net on board is 4.413 ~ 4.891V 2), more than 6V: the voltage of "5V" net on board is 1.16V, there's no short breakdown voltage delivered from Zener actually, we've thought it would still have couple seconds about 5.6V, but actually not. This is good. Since the almost percentage current flows through Zener. Compared to NO LOAD condition, there's still existed couple seconds to hold breakdown voltage but with lower current varied by fuse. Also that survival 1.16V disappear after I turned VGA monitor power off. 3), 5.25V: temperatures on fuse and Zener ==> 36.4 / 39.3 better than 5.1V Zener ==> 41.1 / 46.3 4), -4.75 ~ -20V: works ok. So eventually with Zener and resettable fuse, we got the protection goal with regression. -Adam
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