Hi Kiste, 2011/2/5 Oliver Seitz <[email protected]>
> >> Both USB and U1 have short circuit protected outputs. > > You mean, power rails on USB connectors at a computer are short-circuit > protected? This is true, but the protection is often a non-resettable SMD > fuse somewhere in the middle of a very big PCB called mainboard... I'd > prefer not to blow that one. > :) OK, so I can put another SMD fuse for USB. >The trouble with polarity protection (this is what we're talking about > isn't ?) is the drop voltage involved with diode. > > Only if you're using a diode in series. You could also use the fuse and a > reasonably strong schottky diode from ground. So, reverse polarity will not > go beyond 0.5V, and the fuse will blow when strong reverse power is applied. > Thanks for the tip. Could you point to some direction about this diode ? I was also thinking about using a schottky diode to regulate max 3.3V. I mean, according to my last power supply schematic, if user select USB but no regulation, xbee could be damaged for instance. Could a 3.3V schottky diode be used for thi purpose ? (make sure it won't be more than 3.3V ?) Cheers, Seb -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
