What are SEPIC circuits and their pros/cons?

Lucien

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Sep 15, 2002
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I've been poking through the various datasheets for boost and buck converter ICs, and often come across schematics for SEPIC circuts. As far as I can tell, they allow for the Vin range to cover the Vout of the circuit. Is this correct?

Also what are the advantages/disadvantages of this kind of circuit design? Seems to me that using one to power a LS would allow for more variety in choice of batteries.
 

star882

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Sep 7, 2002
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C:\\Program Files\\CPF
Very good!
Use one to power a 5w luxeon from 6 D-cells, and the light will shine bright even when the batteries are very low.
It is a good idea to light a red LED as a low battery indicator.
 
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