Or, should I keep another fuse at its first place, after regulation ? I first thought that put this fue here would protect USB (but not the regulation part) and the whole circuit.
Please enlighten me ! Seb 2011/2/5 Sebastien Lelong <[email protected]> > 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 > -- Sébastien Lelong http://www.sirloon.net http://sirbot.org -- 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.
