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Old 1st December 2007, 07:49 PM   #41
Eva is offline Eva  Spain
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5mm is the distance routinely found on most consumer equipment. You know, rules are not the same for everyone.
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Old 3rd December 2007, 03:11 PM   #42
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Quote:
Originally posted by Eva
5mm is the distance routinely found on most consumer equipment. You know, rules are not the same for everyone.
I would expect that most of the manufacturers are able to ensure the proper CTI value of their PCBs.
More difficult are the CTI properties of transformer isolation materials. (Designing safe transformers is master mind fun anyway. 3D creepage thinking is always good for some pitfalls...)

...well, and then there are of course some cruel guys, who do not care about anything and simply sell unsafe products...
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Old 24th July 2008, 05:11 PM   #43
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how many watts can i get by using this core ?

at 50khz - % 75 duty cycle max

http://specs.mag-inc.com/PowderCore/0077908A7.pdf
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Old 24th July 2008, 10:00 PM   #44
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This core is not intended for use as a transformer. Its intended to be used as a high current inductor.
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Old 25th July 2008, 06:02 PM   #45
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but kool mu meterial for flyback smps
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Old 26th July 2008, 05:14 AM   #46
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There are essentially two problems with toroids in off-line flybacks:

- The required 3KV mains isolation is quite hard to achieve

- At 1000W, the resulting leakage inductance may easily require a 100W active clamp in the primary side.
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Old 27th July 2008, 08:14 PM   #47
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Cool Mu for flybacks is only suitful if you want to operate a low frequencies between 20kHz-30kHz and when you have not continuous power, but short term high power with low average power.
In fact the last condition is reality in SMPS for audio.
But Eva is right, torroids make it very difficult to ensure safety isolation - except you are going to use special tripple isolated wires....
If you want to stick with Cool Mu, I would propose that you search for a reasonable E-shape Cool Mu.
E-core-bobbins allow proper isolated winding constructions with margin tapes at the sides for correct creepages. Furtheron E-core-bobbins make it easy to go for interleaved windings in order to reduce the leakage inductance.
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Old 17th January 2009, 11:32 AM   #48
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Default aa

That Schematic, was modified, becuase the AD# is not shown on top of the page.
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