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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th August 2012, 03:26 PM   #11
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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.
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Old 29th August 2012, 06:15 PM   #12
stewin is offline stewin  Kenya
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i sure hope you try hi voltage like 90+/- many amps cannot operate with that high voltage.
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Old 29th August 2012, 06:19 PM   #13
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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.
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Old 29th August 2012, 07:36 PM   #14
stewin is offline stewin  Kenya
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igbt as class d output stage? but they are very slow .

what voltage do you have in mind?
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Old 29th August 2012, 08:04 PM   #15
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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(http://www.fairchildsemi.com/ds/FP/FP7G50US60.pdf) 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.
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Old 29th August 2012, 09:05 PM   #16
stewin is offline stewin  Kenya
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that igbt is great it can make a 3kwts smps with no issues .
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Old 1st September 2012, 12:52 PM   #17
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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.
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Old 1st September 2012, 04:32 PM   #18
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A video: Simple Class D amplifier - YouTube
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Old 8th September 2012, 09:29 AM   #19
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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.
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Old 21st January 2013, 12:24 AM   #20
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Quote:
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.
luizcpimenta@yahoo.com.br
luizcpimenta@gmail.com
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