On Sat, 15 Nov 2008 17:18:24 -0500, steve@fl-eng.com 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?