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Original Message
Topic Buck Topology 

Why is the word BUCK used for Step-Down. Boost is obvious, but BUCK does not seem to have a raison-dÍtre.
Date 3/31/2011 1:41:03 PM 
Author John S 
Pageviews 2409 


Response topic Buck Topology 
The buck was originally called a "down converter" as it reduced the input voltage down to a lower level. Usually was implemented with a PNP bipolar in those days. The term buck refers to the switching action "bucking" or kicking back against the input voltage, due to the action of the power inductor. Without this inductor, one would simply be filtering the input voltage with the output capacitance, and Vout would equal Vin!
Author William I. Behen 
Date 11/21/2011 2:28:07 PM 
Response topic Buck Topology 
I don't really know. At first they were called "Switchers" and I guess it was Middlebrook who I first heard use the terms Buck & Boost.
BTW, it's not that a Buck can't raise the input, or a Boost lower it, it's HOW thats accomplished that matters. Prehaps the reason for the names are buried ther?
Author Bill S 
Date 8/16/2011 9:02:17 PM 


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