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Old 4th September 2008, 09:43 AM   #1
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Default a filter for 500watts amp

hi..me and my friend want to make a 500watts class d amp with IRS2092 chip..we have different transistors..i am planning to use irf540st(low gate charge) and my friend is gonna use lateral type 250watts rms class d mosfet.its here

http://www.classd.ltd.uk/product.php...cat=266&page=1

i made a simple class d design with ir2110s some years ago but now i am making class a amps and forgot which LC filter which core (mpp thinz? or ferrite)may i use for this amps.i think the sampling frequency will be 300kHz.it will sound at 20Hz-20kHz.my friend want to have a quality filter.he always want to have quality stuff . can you give me a good advice.thanks
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Old 5th September 2008, 07:32 PM   #2
ajazz is offline ajazz  India
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Air Core filter sounds the best in any ClassD Amp, but be sure to shield the whole apparatus to avoid EMI problems.

Best of luck

ajazz
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Old 5th September 2008, 07:43 PM   #3
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Default air core?

do you mean no core?just copper?how can we get 5amps 20uh copper filter?we dont have lcr meter.its measurement was on my university physics book in the past i cant find it now thanks
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Old 5th September 2008, 08:19 PM   #4
ajazz is offline ajazz  India
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As per my experience for a supply upto +-80V a Air core inductor made of 16G litz wire on a former size of 1inch ID and 1inch width wound with approx 100 turns should give you the required inductunce. You may have to experiment with the No of turns to get the required uh. 40uh + .47uf to ground recommended for best performance as per various datasheets.

All the best
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Old 5th September 2008, 08:26 PM   #5
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T106-2 Iron powder core.
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Old 6th September 2008, 06:45 PM   #6
Kay is offline Kay
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Quote:
Originally posted by ajazz
Air Core filter sounds the best in any ClassD Amp, but be sure to shield the whole apparatus to avoid EMI problems.

Best of luck

ajazz

please, show us a picture
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Kay
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Old 6th September 2008, 07:48 PM   #7
Eva is offline Eva  Spain
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Air core at those voltage levels results in too high stray magnetic fields. It's not a good idea.

Those laterals doesn't even seem to have a datasheet available. They are usually intended for linear applications. They may exhibit terrible switching performance.
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Old 6th September 2008, 08:35 PM   #8
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Default amps with laterals

http://www.classd.ltd.uk/Datasheets/...D%20NX%27s.pdf they make class d amps using these mosfets..they are very good amps

and also now i connected it to my single ended class a amp..it sounds good also

but my single ended amp is for using vertical mos irfp150n..which resistor values should i change? amp is ras10 single ended..
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Old 7th September 2008, 05:08 PM   #9
baga is offline baga  Romania
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http://www.classd.ltd.uk/Datasheets...CD%20NX%27s.pdf
Those are not class d amps
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Old 6th December 2008, 08:58 AM   #10
ajazz is offline ajazz  India
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Default Opto coupled 3KW

Sorry for the photo quality. This trial amp was for the DIY and it works well, but later scraped the idea because of costly components.
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