Yes, I will get the datasheet and send you a recommened link when I get back to my office Monday > > From: Joseph Smith <[EMAIL PROTECTED]> > Date: 2008/11/15 Sat PM 06:44:34 EST > To: [EMAIL PROTECTED] > CC: Peter Stuge <[EMAIL PROTECTED]>, coreboot <[email protected]> > Subject: Re: [coreboot] LPCflasher Project > > > > > On Sat, 15 Nov 2008 17:18:24 -0500, <[EMAIL PROTECTED]> wrote: > > Hi > > > > You could diode isolate the vin to a buck boost to isolate it's input and > > you > > can diode isolate its output to create a pseduo isolated regulator that > > would > > prevent reverse bias from being a big problem. > > > > Typically, the output stage of a buck/buck-boost regulator is an > inductor- > > capacitor. The voltage on the cap is the regulated rippled/filtered > > output. > > Then there usually is a resistor feedback network right at the capacitor > > to > > feedback the cap voltage to the regulator IC and close the loop; so you > > can > > actually regulate the output. > > > > You can usually put a diode after the inductor and before the capacitor > to > > pseudo isolate the output. The feedback network should still be located > at > > the capacitor though. This way, the regulator will achieve your desired > > output > > voltage (that you set through the resistor divider network) regardless of > > the > > diode drops. > > > Ok thanks, can you point me to an example schematic on the web somewhere? > > -- > Thanks, > Joseph Smith > Set-Top-Linux > www.settoplinux.org > > > -- > coreboot mailing list: [email protected] > http://www.coreboot.org/mailman/listinfo/coreboot >
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