If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.
Special Thanks To:
Aaron Holmes
Aaron Wheeler
Adam Horden
Alan Scrimgeour
Andre
Andrew Haynes
Anonymous000
asabase
Austin Weil
barney
Barry
Bert Hickman
Bill Kukowski
Blitzorn
Brandon Paradelas
Bruce Bowling
BubeeMike
Byong Park
Cesiumsponge
Chris F.
Chris Hooper
Corey Worthington
Derek Woodroffe
Dalus
Dan Strother
Daniel Davis
Daniel Uhrenholt
datasheetarchive
Dave Billington
Dave Marshall
David F.
Dennis Rogers
drelectrix
Dr. John Gudenas
Dr. Spark
E.TexasTesla
eastvoltresearch
Eirik Taylor
Erik Dyakov
Erlend^SE
Finn Hammer
Firebug24k
GalliumMan
Gary Peterson
George Slade
GhostNull
Gordon Mcknight
Graham Armitage
Grant
GreySoul
Henry H
IamSmooth
In memory of Leo Powning
Jacob Cash
James Howells
James Pawson
Jeff Greenfield
Jeff Thomas
Jesse Frost
Jim Mitchell
jlr134
Joe Mastroianni
John Forcina
John Oberg
John Willcutt
Jon Newcomb
klugesmith
Leslie Wright
Lutz Hoffman
Mads Barnkob
Martin King
Mats Karlsson
Matt Gibson
Matthew Guidry
mbd
Michael D'Angelo
Mikkel
mileswaldron
mister_rf
Neil Foster
Nick de Smith
Nick Soroka
nicklenorp
Nik
Norman Stanley
Patrick Coleman
Paul Brodie
Paul Jordan
Paul Montgomery
Ped
Peter Krogen
Peter Terren
PhilGood
Richard Feldman
Robert Bush
Royce Bailey
Scott Fusare
Scott Newman
smiffy
Stella
Steven Busic
Steve Conner
Steve Jones
Steve Ward
Sulaiman
Thomas Coyle
Thomas A. Wallace
Thomas W
Timo
Torch
Ulf Jonsson
vasil
Vaxian
vladi mazzilli
wastehl
Weston
William Kim
William N.
William Stehl
Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Registered Member #142
Joined: Sat Feb 11 2006, 01:19PM
Location:
Posts: 102
Looking to build a one volt, one watt dc to dc converter, input 5 to 18 volts. 5 or 10% regulation good enough. Simplicity is the order of the day. Topologies, links, suggestions welcome.
It will drive the base of a power transistor used in a switching cascode configuration.
Registered Member #142
Joined: Sat Feb 11 2006, 01:19PM
Location:
Posts: 102
I did request a sample. Unfortunately, if I ever want to use this chip again, the minimum quantity to buy is 90, available only from TI, not one of their listed vendors stocks it.
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
He is talking about 1V 1W, so I suppose it is 1A. A simple buck converter driven from a 555 timer could do this, but I don't know if the regulation would be good enough.
Interesting. I assume input is on the left and output on the right, which means that circuit is open loop. It might work for a constant load like a lamp, which is what they said they used it for. But what happens with a dynamic load? To make a simple circuit like that but with load regulation, maybe youse gotta use a real feedback loop from the output, with hysteresis so that it switches instead of running linear. Require a few extra resistors. Maybe I'll see if I can work up something like that, using an op-amp and mosfet or darlington. Edit: D'oh, and an inductor.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I'm guessing you want an isolated DC-DC converter to give a floating supply? I developed a simple DC-DC converter based on the "ZVS" circuit to power the outboard floating IGBT drivers on my next coil. It's unregulated but seems to work well enough. There was a thread about it on the old board:
If you don't need any isolation, a plain buck converter will do fine and you can easily make one of those with a TL494 or whatever.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
To make a simple circuit like that but with load regulation, maybe youse gotta use a real feedback loop from the output, with hysteresis so that it switches instead of running linear.
There is nothing linear about the circuit, the transistor gets a squarewave in the kHz to MHz range depending on what components are used.
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.
suggestions for simple low power, 1 volt converter
