irs2092 schematic confirmation - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

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 20th July 2011, 05:05 PM   #21
diyAudio Member
 
Join Date: Feb 2009
they say 9A peak, and 2A with a 10mA input, but what would be the Itrip ? 5A sounds good to me.. at what output current do you run it, luka ?
  Reply With Quote
Old 20th July 2011, 05:42 PM   #22
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
I have 100R on between IRS and it, about 11v on upper driver, 12v on bottom one, so... I use >100ma on input to drive it, so source current could be 9A and sink should be in 5.5A range. But do note, that I have 10r gate resistors, don't want to turn fets on too fast, but primary goal with them was to take load of IRS

also note that they cost like 0.2€/pc, so nothing more then if you wouldn't use them
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA
  Reply With Quote
Old 20th July 2011, 10:11 PM   #23
diyAudio Member
 
Join Date: Feb 2009
could i still use i diode for sink current ?
  Reply With Quote
Old 20th July 2011, 10:36 PM   #24
diyAudio Member
 
Join Date: Feb 2009
I plan to do 3 separated amp.. 30A 12V power supply would be ok for VCC ? i found this one, kinda cheap!

DC 12V 30A Universal Regulated Switching Power Supply | eBay
  Reply With Quote
Old 20th July 2011, 10:43 PM   #25
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by philuknow View Post
I plan to do 3 separated amp.. 30A 12V power supply would be ok for VCC ? i found this one, kinda cheap!

DC 12V 30A Universal Regulated Switching Power Supply | eBay
Even 1 amp at 12 volts will be overkill.
I just drop the voltage from +45 volts through a couple of high watt resistors into a 7812 regulator.
__________________
PCBCAD50 software. http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 20th July 2011, 11:00 PM   #26
diyAudio Member
 
Join Date: Feb 2009
that much ?
i mean.. with the 9A peak of the gate buffer 1A would be ok ?
  Reply With Quote
Old 20th July 2011, 11:07 PM   #27
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
Quote:
Originally Posted by philuknow View Post
that much ?
i mean.. with the 9A peak of the gate buffer 1A would be ok ?
The last time I measued the VCC current it was about 250mA max.

The current pulse into the MOSFET gates is very short.
It only requires enough to charge up the gate capacitance.
__________________
PCBCAD50 software. http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 20th July 2011, 11:49 PM   #28
diyAudio Member
 
Join Date: Feb 2009
anyway.. the 12V 30A is the same price of the 12V 5A so.. haha and since i will use the gate buffer that luka suggested, i will put Rg = 4.7ohm, maybe less.. this way (i think ? ) i'll eliminate my high gate charge problem
  Reply With Quote
Old 21st July 2011, 12:31 AM   #29
diyAudio Member
 
Join Date: Feb 2009
tho, for B+ and B-, for 3amplifiers, what power should i look for ?
  Reply With Quote
Old 21st July 2011, 05:42 AM   #30
luka is offline luka  Slovenia
diyAudio Member
 
luka's Avatar
 
Join Date: Sep 2005
Location: in Slovenia :)
Send a message via Skype™ to luka
Quote:
Originally Posted by philuknow View Post
could i still use i diode for sink current ?
Like I said, nothing else changes, so yes, diodes are still in, I have them too

and for supply, unless you will mainly use it for something else, you need <<<<<<<<<<500mA for gate drivers, I just wanted to point out, if you would use drop resistors, you would need to change resistance of them, if you went from say 250k switching freq. to 500k

Quote:
Originally Posted by philuknow View Post
that much ?
i mean.. with the 9A peak of the gate buffer 1A would be ok ?
Yes but do note, that most energy in that small amount of time (turning on fet) will be drawn from capacitor, you need this supply only to charge capacitor in 1000x longer time back up

Quote:
Originally Posted by philuknow View Post
anyway.. the 12V 30A is the same price of the 12V 5A so.. haha and since i will use the gate buffer that luka suggested, i will put Rg = 4.7ohm, maybe less.. this way (i think ? ) i'll eliminate my high gate charge problem
Don't get to crazy with low Rg, you'll get hole new set of problems by lowering it too much, I wouldn't go below 4.7, in fact I would stay at 10R as I am now. And I am saying thig because I have almost the same gate charge as you do
EDIT: no you have fets will smaller gate charge, what you wrote is MAX

Quote:
Originally Posted by philuknow View Post
tho, for B+ and B-, for 3amplifiers, what power should i look for ?
Yes and no. This depends on:
what kind of music will you listen to, how loud (how much power will amp need to deliver), what size of stored energy will you have in supply lines B+ and B-
__________________
home page @ http://www.classdaudio.tk/ @ 24/7 all year long
I FEEL SLOVENIA

Last edited by luka; 21st July 2011 at 05:53 AM.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Order Confirmation TjongKristian Chipamp 1 23rd November 2009 10:15 PM


New To Site? Need Help?

All times are GMT. The time now is 09:30 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2