Commercial (Alpine PDX) Class D Failure Pics and Question about IR2010s - 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 23rd July 2007, 06:28 PM   #1
CBRworm is offline CBRworm  United States
diyAudio Member
 
Join Date: Jan 2007
Location: S. Florida
Default Commercial (Alpine PDX) Class D Failure Pics and Question about IR2010s

Here I have a failed Alpine PDX 1000.1

If you are not familiar with it, it is a compact Class D car subwoofer amplifier. It's specs say it will drive 1000Watts into a 2-4 ohm load. I didn't find it to do quite that, but it is a nice package. It failed the other day while I had the input muted. It was in a hot trunk, and started by drawing a large pulsing current from the vehicle - enough to make the entire car dim a couple times a second. I did not hear any output from the sub (8 ohm), but it could have been so low a frequency that it was inaudible. The car is not particularly quiet. I turned the input power off, and back on - it blew the 4x20 amp fuses on the board.

Anyway - after taking it apart I found that an International Rectifier driver IC IR2010s (one of two) had popped it's top. I know nothing about class D design, but generally when I see something like that I assume there is another problem which cause a driver chip to let it's smoke out.

You guys being knowledgeable on Class D stuff and probably familiar with this particular family of chips - tell me, should I replace the chip and see what happens? ( I am not fond of working on electronics that have this kind of current capacity) or is it most likely fried and I should just set it aside.

Thanks
Attached Images
File Type: jpg pdx 102.jpg (93.0 KB, 703 views)
  Reply With Quote
Old 24th July 2007, 03:10 AM   #2
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
If the driver chip went kaput you should also check the surrounding parts to verify that they're still ok before just replacing the part and powering it up again. In particular, check to make sure the output mosfets aren't shorted out (which is highly likely).
__________________
Brian
  Reply With Quote
Old 25th July 2007, 03:48 PM   #3
CBRworm is offline CBRworm  United States
diyAudio Member
 
Join Date: Jan 2007
Location: S. Florida
That's what I was thinking too. The attached picture is apparently the output section. I have no idea how to remove/replace these things. I don't even know what package they are. I am thinking they are a BGA mount?

I can check the power supply fets, but the outputs are a mystery to me.
Attached Images
File Type: jpg pdx outputs.jpg (85.0 KB, 514 views)
  Reply With Quote
Old 25th July 2007, 08:59 PM   #4
BWRX is offline BWRX  United States
diyAudio Moderator Emeritus
 
Join Date: Jan 2005
Location: Pennsylvania
They look like IR DirectFETs. At a minimum, you would need a hot air rework station to remove them if any of them are damaged.

This pdf file shows you the connections for one of those packages: http://www.irf.com/technical-info/appnotes/an-1035.pdf
__________________
Brian
  Reply With Quote
Old 27th July 2007, 04:33 PM   #5
diyAudio Member
 
Join Date: Dec 2003
Location: Orange County, CA
Default Alpine Class D

I work with a car audio manufacturer and we blew up ours on the bench. Turns out this amp has a so-so reliability reputation. And a blown 2010 does indicate bad FETs.

What the ICE power rep told me when I tried to buy some of the ICE chips, problems with this amp has led ICE Power to take all car amp design in house and they now only sell the chips if they can engineer the entire product.

They sell me ICE modules but the chips are only available as parts of modules or complete designs from them.

Too bad. It was a nice looking amp.
__________________
Dan Fraser
  Reply With Quote
Old 1st August 2007, 05:18 AM   #6
MOER is offline MOER  United States
diyAudio Member
 
Join Date: Aug 2003
Location: SIMI VALLEY CA
Default Direct FETs

It is very difficult to replace these FETs. We work closely with IR and we use their IRS20955 chip BUT we do not use their diect FETs.

The reason is, all are low current and only available in 100v in quantity (We build 1,000 amplifiers per month so we use lots of Mosfets)

The IR2110 chip blew due to bad mosfets and there is NO way to protect the chip from failure in the event of Mosfet failure.

The IR2110 chip is a relativley slow chip and works well up to 100KHz. I do not know what the oscillator freq in this amplifier is.

My opinion, the time and trouble needed to repair this amplifier ---- go and purchase a new amplifier.

Stephen Mantz
Zed Audio Corp.
  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
Any new commercial Class-D amps available? iwamusr Class D 0 18th December 2007 07:37 PM
Some measurement of commercial class D banana Class D 33 3rd September 2006 01:02 PM
Question about commercial class D amps... pat allen Class D 6 28th March 2006 09:40 AM
Replacing IRFZ42 in Alpine 3558 advice needed....(pics) maxw Car Audio 20 8th July 2005 07:16 PM


New To Site? Need Help?

All times are GMT. The time now is 10:22 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