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How to build a buck boost converter

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alangth

New Member
Hi~
I want to build a buck boost converter
but I can't find any reference to build it~
can anyone help me~

I try to search on ebay for this product

**broken link removed**
Does anyone have any buck boost circuit diagram~?

Need help urgently~ thanks~
 
Dear Nigel Goodwin~

I want to know how to combine both converter~
I know about the example in datasheet just face problem in combine~
as i don't have the basic ~
 
Here's a design using a UC2577 in a buck-boost design.

If you want to know how the ebay circuit combined the two chips you will likely will have to buy one and reverse engineer it like Nigel stated.
 
I can't be sure, but from looking at the picture I suspect that that is not really a single stage buck-boost, but just an integration of separate buck converter and boost converters.

As such, the efficiency will be poor since all the output power has to go through two conversions.
 
here is the circuit
 

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