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Old 25th May 2007, 11:26 AM   #11
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I think so same as zerohead, the flayback PSU using at some power amplifier and usually welder apparatus, but you must cooling to IGBT very well,,

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Old 26th May 2007, 11:38 AM   #12
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Hi,

I would build a 28V/40A SMPS.
Would this PSU a good start?

Thx,
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Old 26th May 2007, 04:49 PM   #13
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Quote:
Originally posted by sixtek
Hi,

I would build a 28V/40A SMPS.
Would this PSU a good start?

Thx,
good lucks
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Old 5th June 2007, 03:02 AM   #14
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Hi Zero,

Have you tried it in your setup...
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Old 6th June 2007, 05:16 PM   #15
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Quote:
Originally posted by Workhorse
Hi Zero,

Have you tried it in your setup...

transformer not ready...waiting....
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Old 15th June 2007, 11:27 AM   #16
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hm... everything is possible, but not everything makes sense...
Does anybody have the link to the full appliction note?
My search at ONSEMI did not show this beast.

I am really wondering about the trafo design. They use 3mm wires at 40kHz? Strange! Even if we consider a single layer winding (no need to consider proximity effect) and ignore that flybacks ussually have airgaps with catastrophic fields (leading to eddy current issues in the winding...) .... even then, just from the skin effect wires above 1mm are a waste of copper. At 40kHz already at 0.32mm below the surface the current density down to 30%. The inner area of the copper doesn't carry much current.

Which core do they use?
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Old 15th June 2007, 06:54 PM   #17
star882 is offline star882  United States
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Quote:
Originally posted by Eva
Well, I forgot to mention that class D and rail tracking tend to exhibit 80-90% power efficiency regardless of the crest factor of the music signal, that's why those amplifiers can play high power music with a small PSU. Most of the power drwan from mains supply is just delivered to the loudspeaker. Plain class AB playing music tends to waste into heat 80-90% of the power delivered by the PSU.

PS: Get some reasonably sized class D module, like UCD180/400/800, and use it to play your favourite music into a full range speaker at clipping threshold. Then measure average current consumption.You will probably have a hard time believing how much class D music you can get out of, say, 50W PSU power.
Class D sure is efficient! I have an old 30w Philips amp (USB input) that can play really loud without distortion, while only getting warm in the process.
My current amp is 260w, also by Philips. It has S/PDIF input and is very amazing for efficiency. TI PurePath technology is simply amazing. I'm surprised why it's not used more and advertised more as it's environmentally friendly (uses less than half the power of a traditional analog amplifier) and cheaper at high power. With digital sources, the quality is better as the D/A conversion is done at high power levels.
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Old 8th November 2007, 07:11 PM   #18
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Final schema


i have got all the electronic components but gapped etd59 transformer
Attached Files
File Type: pdf fly 40k.pdf (26.9 KB, 541 views)
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Old 18th November 2007, 04:02 PM   #19
Khron is offline Khron  Romania
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Any chance of seeing a PCB design?
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Old 20th November 2007, 04:35 AM   #20
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Zero

Your Flyback cannot work with a 600V igbt with mains voltage at 240VAC, you need at least 1200V Igbt to do the job...
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