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 #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
ok, revision three here:
i tried to put the caps closer to the ucc's, and improve the general layout of the board according to what you guys have said. hope this is better. -ben
Registered Member #4362
Joined: Sat Jan 21 2012, 03:44AM
Location: Texas
Posts: 98
Well i'm a newbie but i'll give you my .02 cents. LOL It looks like it matches your initial schematic ok. I was woried about the irf520 source not being on the same ground plain as the 74ls14n but I see where you snaked it around on the bottom.
Are you going to photo etch this somehow? I have had bad luck free handing multiple traces under ICs like you have under the 74ls14.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
yea, i do photoetch, and i am actualy posing this while its being exposed. look at uzzors's site, he has some good stuff on photoetching. i used to do toner transfer, but the quality sucked, so i build a uv led box.
Registered Member #1741
Joined: Sat Oct 04 2008, 02:45AM
Location: Schenectady, NY
Posts: 35
Not to be picky or critical, but the 1N4004s you have chosen are probably not going to do too much for you as output clamps on the UCC27321/2 parts. They're a bit slow and high VF. Footprint is fine but it'll be much better off with some Schottkys.
As for the gate drive decoupling - Whenever I build this circuit, I straddle the + and - rail of the UCC2732x chips with a 1uF X7R and 10uF X5R ceramic cap dead under the IC on the bottom of the card. You can snake enable and RF drive signals right under the cap if it's a 1206 or 1210 part. You won't get a lower inductance path into the die than that.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
For power supply bypassing of gate drive ICs, I got good results using electrolytics only. My last couple of drivers used one 330uF low ESR per chip. It seems like a lot of capacitance, but I think it's useful to have an energy reservoir there for driving a burst into some large IGBTs.
If using ceramic decoupling caps, it's wise to have an electrolytic in there somewhere too. The ESR damps resonances in the power bus.
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.
drsstc 3 ss board
