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Re: How to utilize the inverted (+/-) oput of buck-boost con
Yes, you can do this and there are even ICs that will let you control the circuit.
The one that I know for sure is to use a buck followed by a boost in a configuration
sometimes known as a buck+boost (as opposed to buck-boost). The configuration
is simplified to the one shown in Figure 2 in the attached file.
This topology uses 2 diodes and 2 switches. But depending on if you are in buck mode or boost mode, only one of the switches is being pulse-width modulated. The other switch would be off or on depending on the mode.
If you go to page 66 of the document (page 67 in Acrobat), you should see the
"DC/DC Non-isolated Switching Controllers". On the right side of the page you should see a rectangle with "Multi Topology" area. There you can see the list of IC depending on if you want the transistor external or internal to the IC. With external transistors you can get much more flexibility in the performance.