Breaking News
Design How-To

Power Tip #4: Damping an Input Filter " Part 2 of 2

NO RATINGS
1 saves
Page 1 / 3 Next >
More Related Links
View Comments: Newest First | Oldest First | Threaded View
donschmitt
User Rank
Rookie
re: Power Tip #4: Damping an Input Filter " Part 2 of 2
donschmitt   2/11/2013 1:16:09 AM
NO RATINGS
Robert, The figures for Power Tip #4 are missing. Don

AJW in OR
User Rank
Rookie
re: Power Tip #4: Damping an Input Filter " Part 2 of 2
AJW in OR   8/6/2012 4:37:32 PM
NO RATINGS
I'm getting "404 File Not Found" errors now when I try to view the Figures. Help! Where did they go?

NOPROBLEM
User Rank
Rookie
re: Power Tip #4: Damping an Input Filter " Part 2 of 2
NOPROBLEM   10/2/2008 4:08:50 PM
NO RATINGS
Interesting. I believe there are three basic topologies that dampen the input filter. This extra capacitor has the disadvantage that for instant connection of a high input voltage, the resistor needs to absorb 0.5CU^2. I experienced this as a problem. Another solution, used by computer products is a LC-series combination in parallel with LO. The math behind it is the same. The theme has been discussed since the eighties. I remember three articles. Only one of them uses the calculation of pole location to find an optimum. This should also work for two stage input filters. I could not see in the article presented here wether or not the NEGATIVE input impedance has been used in calculating the frequency spectrum. The second chart I find very interesting, but I wonder what kind of mathematical model has been used to derive it. Is this 50% approach a rule of a thumb thing or does it give the optimum ? Apart from the optimum value of R, there are also a minimum and a maximum value beyond which there are no stable solutions for C.

August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Top Comments of the Week
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.