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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th August 2012, 04:26 PM  
Join Date: Jan 2005
I never got that far, i had it runnig on 2x37V when a ground wire came loose and landed straight onto the gate for the high side fet = *POOF* and after that the IR2110 and both IRFP450's were dead.
Old 29th August 2012, 07:15 PM  
stewin is offline stewin  Kenya
diyAudio Member
Join Date: Jul 2007
i sure hope you try hi voltage like 90+/- many amps cannot operate with that high voltage.
Old 29th August 2012, 07:19 PM  
Join Date: Jan 2005
My plan was to use a 50A 600V IGBT module for the output stage, i alrready tried this an d on 2x38VDC and 500kHz, the module with no heatsing only got slightly warm, the audio part dident worth though as i tried it with transformer coupled gate drive.

I'll resume the work on this this weekend, and i will socket the IR2110 so it can be easily replaced when needed.
Old 29th August 2012, 08:36 PM  
stewin is offline stewin  Kenya
diyAudio Member
Join Date: Jul 2007
igbt as class d output stage? but they are very slow .

what voltage do you have in mind?
Old 29th August 2012, 09:04 PM  
Join Date: Jan 2005
The old igbts were slow, the modern ones are almost as fast as mosfets.

As i said i ran a modern fairchild transfer molded igbt halfbridge module( at 500kHz with 2x38VDC and it only got slightly warm just laying on the table, and that with lousy transformer gate drive and no heatsink.
Old 29th August 2012, 10:05 PM  
stewin is offline stewin  Kenya
diyAudio Member
Join Date: Jul 2007
that igbt is great it can make a 3kwts smps with no issues .
Old 1st September 2012, 01:52 PM  
Join Date: Jan 2005
This Fairchild IGBT just proved itself, a short piece of thin wire lietrally melted at near max power output, was cranking to near 99% duty cycle when i looked over and saw smoke.

Despite this abuse, the IGBT module was only ever so slightly warm.
Old 1st September 2012, 05:32 PM  
Join Date: Jan 2005
A video: Simple Class D amplifier - YouTube
Old 8th September 2012, 10:29 AM  
Join Date: Jan 2005
A new video: Feedbackless class d amp pounding it - YouTube

Rail voltages are now 2x60V, but for some reason 30-35V is the max i can get out, even when its clipping and hitting the rails.

The fets remain barely warm to the touch.
Old 21st January 2013, 01:24 AM  
diyAudio Member
Join Date: Oct 2009
Originally Posted by apexaudio View Post
You can try triangle oscillator from JBL 200kHz with single OP (1/2 TL072).
Good evening.
You can send me the complete layout of this amplifier?
Thank you.


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