Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Active clamp flyback SMPS
Active clamp flyback SMPS
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 15th December 2011, 03:58 PM   #1
eem2am is offline eem2am
Join Date: Jun 2011
Default Active clamp flyback SMPS

Has any reader tried to do an active clamp flyback to power a class D amplifier?

I cannot find a controller for it.....they all seem to be for active clamp forwards.

The leakage dissipation of a normal flyback at 350W is a pain......the clamp components need to be big.
-I have to say i reject use of DZ clamps, since TVS's are in "DO" packages, and these are simply NOT meant for continuous power dissipation of more then 1W, at the very most.

There is good reason why TVS diodes are not made in TO220 heatsinkable packages.....its because theyre not supposed to be used with continuous significant power.
  Reply With Quote
Old 23rd December 2011, 08:37 AM   #2
eem2am is offline eem2am
Join Date: Jun 2011
Actually i find controller for Active Clamp Flyback...UCC2891.

...However, i am disappointed in this topology.....it is advertised as ZVS.

But the ZVS only applies to the turn on of the fet....not the turn off.

....this is a little pointless in a flyback, because the turn-off switching loss is by far the worst........even in a normal flyback, the turn-on switching loss is snubbed by the leakage, so i cannot see much point in the active clamp flyback.....though i have to admit that turn-off switching losses will be a little reduced as the VDS at turn off isnt quite so high.

Last edited by eem2am; 23rd December 2011 at 08:38 AM. Reason: spelling
  Reply With Quote


Active clamp flyback SMPSHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
A 65W Flyback SMPS tylerjbrooks Power Supplies 19 3rd November 2012 12:13 AM
self oscillating flyback smps blackmamba Power Supplies 15 19th October 2011 07:51 AM
my 80W flyback smps rikvancoolwijk Power Supplies 13 24th March 2011 11:52 AM
SMPS flyback, transistor problem Archion Power Supplies 4 13th May 2010 05:13 PM
SMPS, flyback, or vibrator - how to get 280v off of some batteries? Spasticteapot Power Supplies 3 14th July 2007 02:16 AM

New To Site? Need Help?

All times are GMT. The time now is 07:48 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio