 Buck Boost Positive to Positive Voltage regulator?
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Inducktion
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Sun Sept 18 2011, 03:51AM
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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
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How can I use this as a positive to positive voltage buck-boost regulator? I'm trying to make a solar charger... but for some reason the designs in the datasheet are all for everything I basically don't need. :(
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Sulaiman
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Sun Sept 18 2011, 06:48AM
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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
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For a positive supply to positive output with a single inductor you can have EITHER buck OR boost.
For buck/boost a transformer would be required.
e.g. flyback.
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Dr. Slack
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Sun Sept 18 2011, 06:55AM
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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
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You've picked a single switch, single inductor device, which can only invert polarity when doing a buck boost. You need both input *and* output switches with a single inductor for a non-inverting buck boost. With a transformer, any polarity can be chosen of course.
If you're connecting a solar panel and a battery, surely you can pick polarities to match the components you have to hand? Or have you already bolted them down to a common ground?
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