Only on the control pin (which is called Vdd in the spec sheet). And silicon diodes typically have about 0.6V drop across them.
The AMC7135 is supposed to be able to cope with 6V, so not a prob. It doesn't really need the diode if you're always going to connect the voltage the right way around, and the input voltage isn't too high but in most situations it certainly doesn't hurt.
Both the AMC7135 and the µcontroler 12F629 are able to run at 6V.
12F629 datasheet says that max VDD is 6,5 V (page 85)
AMC7135 datasheet says that VDD max is 6V (and 7V absolute max)
So it seems to be safe to use it at 6V max
And my question is :
I would like to test this board with a 14500 battery (3.7V nominal and 4.2V max)
I know that this board has a drop out of 0,12V
To have a pretty good regulation Vin should be more than VF+0.12.
With a Cree Q5 driven at 1A VF = 3.7V (datasheet
here see page 7)
So Vin > 3,82 V which is above the typical value for a Li Ion bat....
And the question is... as I have a Utrafire C3 with extension tube I can put into this flashlight 2 AA cells or ... 1AA + 1 LiIon 14500 ...
Do you think that I should dare to mix in the same flaslight a protected LiIon and a 1AA ...
Such a combination could give : 1.2 + 3.7 = 4.9 V which should be in the "high efficiency" zone of the AMC7135 chip (77% and more when the bat will decrease)... see here
the curves provided be Drewfus2101.
And 1,5 + 4.2 = 5,7V when both bat are fully charged... a value still less than the max 6 V supported by the board...
My ONLY doubt is this "good idea" which could be dangerous for the LiIon or the NIMh
I can imagine that the regulation of the LiIon will cut hte bat when the voltage will drop under 3V... and could prevent to damage the LiIon... But for the NiMh ???
As the driver is also there to limit the current to 1A in the led... what could happen to the two batteries in serie ???
Please confirm that this is safe:wave:... or not :devil:
Thanks
JP