YJ-IRAUD 350 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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 30th April 2015, 11:12 PM   #1
diyAudio Member
 
Join Date: Mar 2010
Location: Pompei
Post YJ-IRAUD 350

Hi DIYers
I paid a module YJ-IRAUD350 38 on Aliexpress and I was immediately pleased with his good sound. I have a big problem, in spite of the power supplied, the operation time, the impedance of the speaker, the power supply voltage, the resistors R6 and R7 adapted for the voltage of 45-0-45 "AC" by 3.9KOhm to 4.7 KOhm, the amplifier goes into protection mode ... and after a few seconds starts to work and this thing becomes cyclical.
These are the conditions of operation:
- Toroidal Transformer 45-0-45 AC - 1000 VA;
- Impedance speakers used: 4 Ohm / 16 Ohm.
- Input: iPod / Computer / Esoteric Analogic Preamplifier / Guitar Tube Preamplifier etc. etc.

The heat sink is hot (50 C) if the volume is high but is lukewarm if the volume is low. I do not know what to do ... Help please. Thanks to all those who will answer

Ing. Giuseppe Clemente
Attached Images
File Type: jpg 710Q+3G+v7L._SL1500_.jpg (98.0 KB, 563 views)
  Reply With Quote
Old 3rd May 2015, 08:54 AM   #2
diyAudio Member
 
Join Date: Sep 2009
Location: Romania,Calarasi
Send a message via Yahoo to ionutzxpo
Hi, change the mosfets with IRFB4020 or IRFB5615 if your power supply is not greater than +/-60Vcc
__________________
Iacob Ionut
  Reply With Quote
Old 3rd May 2015, 01:41 PM   #3
diyAudio Member
 
Join Date: Mar 2010
Location: Pompei
Jacob thanks for your answer.
Yours is good advice, but I do not know if I can implement it because I use a toroidal transformer with secondary 45-0-45 ... therefore I have a DC voltage of 45 x 1:41 = 63.5 Volt.
You advise me to change also the mosfet?
You think that I'm using the MOSFET is defective?

thanks for your patience :-)
  Reply With Quote
Old 17th May 2015, 06:18 PM   #4
diyAudio Member
 
chienmort's Avatar
 
Join Date: Dec 2012
I think Jacob means that as your DC voltage is over 60V-0-60V then you need higher voltage MOSFETS.
  Reply With Quote
Old 19th May 2015, 10:37 AM   #5
diyAudio Member
 
Join Date: Mar 2010
Location: Pompei
chienmort Thank's for your reply
... mmmmmmmm in these conditions I don't know what mosfet to use...
Now I try on data sheet....

This anomalous behavior, the amplifier will block, is a behavior that I found on all amplifiers in class D. I bought, for the game, a 10-watt stereo amplifier, Class D, I plugged my speakers , Martin Logan Aerius, and listening is great but if I exaggerate with the volume, stop all, I have to turn off and turn it back on. The source is a sound card Metric Halo ULN-8.

It is possible that this is an undesirable feature of all the systems in class D?
  Reply With Quote
Old 20th May 2015, 02:00 PM   #6
diyAudio Member
 
chienmort's Avatar
 
Join Date: Dec 2012
Over voltage protection is protecting the MOSFETS from operating outside their maximum ratings, voltage, currant or temperature. All these parameters are interrelated and are set by the IRS2092 controller. Most Class D designs will incorporate some or all of these protections.

Protection circuits make a discrete design very complex and can often cause as many problems as they solve. Most class A/B Amos they have short circuit protection, a crude form iof over current protection but no over voltage protection.

I am no expert on MOSFETS but there is a chart on the IR website showing clearly what MOSFETS are good for what voltage/power/impedances. Unfortunately I cannot find it at the moment.
  Reply With Quote
Old 21st May 2015, 02:55 AM   #7
diyAudio Member
 
nigelwright7557's Avatar
 
Join Date: Apr 2008
Location: Carlisle, England
The 2092 is detecting an over current event and is resetting itself for a few seconds.
I don't know what mosfets you have in there but if they 4019's they wont drive 4 ohm loads.
If you want to drive 4 ohm loads then you need better mosfet. The trouble is more powerful mosfets tend to have higher capacitance which will upset over current detect again.
I would try it with 8 ohm speaker and see how you get on.
__________________
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
  Reply With Quote
Old 24th May 2015, 09:00 AM   #8
diyAudio Member
 
Join Date: Oct 2007
the infineon IPP320N20N3GXKSA1 is a much better choice, 3xlower rdson,still lower gatecharge and reverse capacitance than the fets normally sold with this aliexpress device. I changed the relay into a 48V device to save power in de series resistors.
the change to 4.7K may not be needed, it is advised for voltages above 50V AC. 3.9K for 40- 45Vac. you may run short on the local rails otherwise
  Reply With Quote
Old 24th May 2015, 09:11 AM   #9
diyAudio Member
 
Join Date: Oct 2007
i'm about to test my setup, same 45-0-45 500VA toroid. let you know how that goes...
  Reply With Quote
Old 24th May 2015, 09:35 AM   #10
diyAudio Member
 
Join Date: Oct 2007
it's a bridge mode using 2 IRAUD350, and 2 smaller ones for the HF side, bridge driving into 16 ohms. plus softstart and dc prot on the left PCB with 2 relays.
Attached Images
File Type: jpg IMG_1332[1].jpg (204.2 KB, 326 views)
  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
Spring Push Button yj waxernz Parts 1 4th November 2013 02:42 AM
For Sale Brand New 2X CDJ-350 + DJM-350 Mixer Limited Editio musicware Vendor's Bazaar 0 30th September 2013 11:05 PM
$50 Hammond 373BX 187VA 350-0-350 Transformer maxseeley Swap Meet 0 28th November 2011 06:24 AM


New To Site? Need Help?

All times are GMT. The time now is 11:05 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki