New Chip From IR, IRS20124S. - 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 19th September 2005, 05:35 AM   #1
Tim__x is offline Tim__x  Canada
diyAudio Member
 
Join Date: Jun 2004
Location: Edmonton area, Alberta
Default New Chip From IR, IRS20124S.

I just wanted to bring a neat new gate driver to your attention.

IRS20124S Announcment

It's got a built in dead time generator.
  Reply With Quote
Old 19th September 2005, 08:27 AM   #2
IVX is offline IVX  Russian Federation
diyAudio Member
 
IVX's Avatar
 
Join Date: Jul 2003
Location: Everywhere (Buddhist's context)
Nice chip, but why SD implemented so strange, they have not more silicon area for only ONE 10mA mosfet?
__________________
Best regards,
E1.
  Reply With Quote
Old 19th September 2005, 02:45 PM   #3
sovadk is offline sovadk  Denmark
diyAudio Member
 
sovadk's Avatar
 
Join Date: Sep 2004
Location: Kaspar Sinding Meyer @ DTU in Lyngby
This looks like a very good MOSFET driver for Class D applications.
It has over-current protection, 4 discrete adjustable deadtime levels, one input to drive both MOSFET's, low propagation delay, +/-1A drive voltage, suited for ~200V environments and shoutdown.
The only thing I could have thought of was an integrated input level shifter for split supply operation.

Let's see what the price and accessibility will be.
  Reply With Quote
Old 19th September 2005, 06:35 PM   #4
Tim__x is offline Tim__x  Canada
diyAudio Member
 
Join Date: Jun 2004
Location: Edmonton area, Alberta
I don't know, IVX, it is a little stange but it makes it very simple to employ shoot through protection without putting the amp in shutdown.

Integrate, or count, the OC error pulses, on the first pulse the dead time is increased from 15ns to 30ns, next OC it is increased to 45ns, and only then after the dead time is on maximum does the amp shutdown.
  Reply With Quote
Old 21st September 2005, 04:12 AM   #5
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
Quote:
Originally posted by IVX
Nice chip, but why SD implemented so strange, they have not more silicon area for only ONE 10mA mosfet?

I'd like to see them use those three NC more constructively and use them as ground planes/ shields between the HO and LO pins which I think should at least be on the same side of the chip!! Have fun making a good PCB for this one. How strange is that?

Might help Mueta and Tripath out too, but I'm sure they must have thought of that themselves yeah? It's just the IDE cable, 40 wire versus 80 wire, where the extra 40 are grounds and it doubles the bandwidth.

So, I love the matched delays, and the slower rise time than fall time.

I don't think I'm a fan of the 4 dead time settings, do you think it can be so simple? Could be tricky to use this thing right.

Thanks for posting about it.

Regards,
Chris
  Reply With Quote
Old 21st September 2005, 01:57 PM   #6
diyAudio Member
 
Join Date: Oct 2003
Location: The Lab
In the lowest dead time setting (15 nS) the tolerance is min 0 and max 40 nS. Enough spread for me to say the dead time is out of control, and therefore the chip is more or less useless for high end Class D audio. Sorry IR!
__________________
www.newclassd.com
  Reply With Quote
Old 25th September 2005, 09:34 PM   #7
diyAudio Member
 
Join Date: Jun 2004
Location: California, USA
Yes, the variance in dead time is a bit scary. It's unfortunate that a great component- and space-saving feature like dead time control in the gate driver seems to be bungled.

Another frighteneing thing about the chip is that the OC protection shouldn't work correctly with a half bridge. In a full bridge, a lower device would always be conducting on one side of the bridge. A half bridge would only allow a proper OC protection half the time and some lesser form of OC protection when the lower device is off. When the blocking diode of the lower device is on a voltage would be present to sense but I'm not totally convinced the OC protection works as advertised bi-drectionally. Maybe I'm missing something.

A propogation delay of 70ns also isn't very good when other drivers have half that.

Overall, at the lower power levels the IRS20124 should be used at it would seem to show promise.
  Reply With Quote
Old 25th September 2005, 09:49 PM   #8
Account Disabled
 
Join Date: Feb 2004
Send a message via AIM to classd4sure Send a message via MSN to classd4sure
You could probably make the dead time on this chip work with some very complex external adaptive circuitry. The only difference from doing it with this driver over most others, you'd require even more complex circuitry in order to step the internal dead time settings up or down as required.

If you can get that to work on paper, you probably won't IRL.

Lars, you were alot bolder in your judgment of this chip than I was, but we're thinking along the same lines.

I've seen light dimmers that are more advanced, IR scewed up on this one, but it's nice to know they're thinking about us

Regards,
Chris
  Reply With Quote
Old 12th October 2005, 02:55 PM   #9
fredos is offline fredos  Canada
diyAudio Member
 
Join Date: Mar 2005
Location: Quebec
Default Canadian guy who work on class D Amp...

Hi guy I'm Fred from www.d-amp.com. Now company is growing and I'm looking for some other technical guy to design small class d amplifier and switching PSU. For now, a 8Kw 1 Rack space amplifier is in production and we looking forward for multichannel amplifier, some DSP stuff and processing. If you'r close to montreal and interested, let me know! Unfortunately, working environement is french, but most people in shop speak english too. Thank's for your time!

Fred

frederic.bourque@d-amp.com
  Reply With Quote
Old 13th October 2005, 06:43 AM   #10
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Montreal is a little far away for commuting - unfortunately !

Regards

Charles
  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
Which Chip AMP you like most? dynabok Chip Amps 154 12th December 2012 01:23 PM
Chip ID glen65 Everything Else 1 2nd October 2008 01:22 AM
Any one need IRS20124S ??? fredos Vendor's Bazaar 10 28th November 2006 07:34 PM
Pre-amp for chip amp wotsascott Chip Amps 23 30th April 2006 04:24 PM
FS 6ch chip amp fcserei Swap Meet 6 28th February 2005 01:59 PM


New To Site? Need Help?

All times are GMT. The time now is 01:33 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