TDA7264 overload protection? - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 25th July 2012, 05:31 PM   #1
diyAudio Member
 
Join Date: May 2008
Default TDA7264 overload protection?

I have a TDA7264 amp I built a few years ago mostly from parts I had laying around.
I'm using two 19V switching supplies to get my two power rails and it has worked very well over the years.
I am currently driving two speakers which claim a nominal impedance of 6 ohms. I realize this is pushing the envelope with 19V rails.


Last night I was pushing the system pretty hard and actually had the amplifier mute it self momentarily three times. Each time was for around 5 seconds.
I'm curious if this is an indication of the thermal protection kicking in, or something else? 5 seconds seems awfully short if its a thermal issue.


Thank you for your time.

Chris J



Click the image to open in full size.

Click the image to open in full size.

Last edited by thetube0a3; 25th July 2012 at 05:39 PM.
  Reply With Quote
Old 25th July 2012, 06:16 PM   #2
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
It could well be thermal.

When you think of the dynamics, the chip itself buried within the package can heat up very rapidly indeed and that heat can't be transmitted to the tab and heatsink quick enough to prevent thermal limiting. 5 seconds seems quick but is plently of time for an overheated few millimeters of silicon to cool via the tab if the overload were transient and the tab and heatsink are relatively cool.
__________________
-------------------------------------------------------
Installing and using LTspice. From beginner to advanced.
  Reply With Quote
Old 10th August 2012, 12:37 AM   #3
diyAudio Member
 
Join Date: Aug 2012
hey guy, would you happen to have the schematics for this???
  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
Overload / Short Circuit Protection, Yet Again... Buckeye Solid State 44 16th February 2011 03:52 PM
Overload and Short Circuit Protection space2000 Solid State 17 5th March 2009 10:26 PM
speaker protection (OR) overload protection myanmar Solid State 7 13th July 2006 08:21 AM
Overload protection circuit. Does it work correctly? Fritzell Solid State 16 19th September 2005 02:19 PM
Subwoofer overload protection? Axeman Subwoofers 24 5th September 2003 04:44 PM


New To Site? Need Help?

All times are GMT. The time now is 08:14 PM.


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