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

Class D Switching Power Amplifiers and Power D/A conversion

IRS2092 CSH
IRS2092 CSH
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
Reply
 
Thread Tools Search this Thread
Old 7th July 2011, 01:35 PM   #1
philuknow is offline philuknow  Canada
diyAudio Member
 
Join Date: Feb 2009
Default IRS2092 CSH

hello there, i had some question about the current sensing of the floating driver.
everything is refered to irf typical diagram

The tension is aquired between CSD and Vs, fine, but what is the reference, and why did they use a different diode (bav19ws) between VB+ and CSH? I guess it is for aquiring signal only when the Ho is on.. but what is the cause of the choice; is it because of dark current?

i'll surly have some more questions after that, thx for further explanation guys!
  Reply With Quote
Old 8th July 2011, 09:26 PM   #2
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
The diode needs to be fast because the class d frequency can be hundreds of KHz.
I use an stth1r02 diode for both fast diode components.

I split the CSD signal with two 4k7 resistors and found that to be good enough for a 500 watt amp into 4 ohms.
__________________
PCBCAD51 pcb design software. 2018 version out now. https://www.ebay.co.uk/sch/i.html?_f...nload&_sacat=0
  Reply With Quote
Old 12th July 2011, 03:04 PM   #3
philuknow is offline philuknow  Canada
diyAudio Member
 
Join Date: Feb 2009
you mean a 4,7k from Vs to CSH then a 4,7k with a diode to VB+ ?
and is the mur120 ( trr = 25ns) could do the job or the 15ns form your stth1r02 is greatly wished? also, the mur120 has a bigger leaking current, (double time) could this cause problem with sensing ?
  Reply With Quote
Old 12th July 2011, 09:13 PM   #4
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
>you mean a 4,7k from Vs to CSH then a 4,7k with a diode to VB+ ?
Yes.


>and is the mur120 ( trr = 25ns) could do the job or the 15ns form your >stth1r02 is greatly wished? also, the mur120 has a bigger leaking current, >(double time) could this cause problem with sensing ?[/QUOTE]

I havent tried a mur120 so cant speak for that but the stth works fine.
__________________
PCBCAD51 pcb design software. 2018 version out now. https://www.ebay.co.uk/sch/i.html?_f...nload&_sacat=0
  Reply With Quote
Old 13th July 2011, 12:53 AM   #5
philuknow is offline philuknow  Canada
diyAudio Member
 
Join Date: Feb 2009
allright, im gonn put a var-res for first pcb proto, thanks
  Reply With Quote
Old 13th July 2011, 01:21 AM   #6
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by philuknow View Post
allright, im gonn put a var-res for first pcb proto, thanks
Remember OCSET sets the over current for the lower mosfet so might be worth putting in a preset there too.
__________________
PCBCAD51 pcb design software. 2018 version out now. https://www.ebay.co.uk/sch/i.html?_f...nload&_sacat=0
  Reply With Quote
Old 13th July 2011, 11:02 PM   #7
philuknow is offline philuknow  Canada
diyAudio Member
 
Join Date: Feb 2009
yeah i know I read all the AN-1138. though in the reference design they but a res between the anode of the diode and HO, for biasing the diode, is it needed ?

http://www.irf.com/technical-info/appnotes/an-1138.pdf
page 11, last sentence
  Reply With Quote
Old 13th July 2011, 11:07 PM   #8
nigelwright7557 is offline nigelwright7557  United Kingdom
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by philuknow View Post
yeah i know I read all the AN-1138. though in the reference design they but a res between the anode of the diode and HO, for biasing the diode, is it needed ?

http://www.irf.com/technical-info/appnotes/an-1138.pdf
page 11, last sentence
Yes it is needed as per reference datasheet.
__________________
PCBCAD51 pcb design software. 2018 version out now. https://www.ebay.co.uk/sch/i.html?_f...nload&_sacat=0
  Reply With Quote

Reply


IRS2092 CSHHide 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
Irs2092 luka Class D 50 15th July 2012 02:48 PM
Irs2092 gxhcdba Class D 11 14th December 2009 11:54 AM
IRS2092 help! yudi02 Class D 2 11th October 2009 04:30 AM
CSH-horn design/build instructions ingvar ahlberg Multi-Way 1 9th April 2008 09:00 PM


New To Site? Need Help?

All times are GMT. The time now is 09:22 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki