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Old 11th March 2012, 09:51 PM   #341
ungie is offline ungie  Canada
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Quote:
Originally Posted by hien.t.nguyen View Post
Hello everyone

I am developing an big amplifier(about 7kW/8ohm full bridge or more) include: Amp and SMPS all in one PCB size 140x350mm
Not sure how you're going to get ~7kW running <100V rails.
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Old 11th March 2012, 10:11 PM   #342
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Quote:
Originally Posted by ungie View Post
Not sure how you're going to get ~7kW running <100V rails.
Sorry,i mistyped from 4ohm load become 8ohm load.

If I use 4 ohm load(full bridge),+/-100V,Pmax < 200x200/4 = 10KW(peak) = 7.07kW(rms)


Thank exactly feedback.

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Old 11th March 2012, 10:29 PM   #343
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YES,Nguyen i mean linear power supply
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Old 11th March 2012, 10:30 PM   #344
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How about a irs2092 based system with tc4420 buffers driving two pairs of IRFB4227 ?
This is what I use and it is very loud.
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Old 11th March 2012, 10:38 PM   #345
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Hi,Nigelwright7557 good day can you post your d design with buffer TC4420 just to compare with nguyen design,thank's
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Old 11th March 2012, 10:45 PM   #346
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Quote:
Originally Posted by don2007ksa View Post
YES,Nguyen i mean linear power supply
I have one design use IRS2092S+IRFI4020H-117P at here:

Power Amplifier and Power Supply Full PWM

If you use parallel two chanel and connect with 4 ohm load is it is 500W/4ohm

Or you replace one IRFI4020H become two IRFB4227,it maybe up to 1000W/4ohm.
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File Type: gif irfb4227.GIF (19.1 KB, 1067 views)
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Old 11th March 2012, 10:51 PM   #347
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Hi,Nigelwright7557 good day can you post your d design with buffer TC4420 just to compare with nguyen design,thank's
It is basically the irs2092 datasheet circuit with two tc4420 buffers added.
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Old 11th March 2012, 11:25 PM   #348
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Quote:
Originally Posted by nigelwright7557 View Post
It is basically the irs2092 datasheet circuit with two tc4420 buffers added.
Yes,at high frequency input impedance of mosfet is low,need use buffer stage to up current driver for mosfets output.

Buffer can use TC4420/4029 or two bjt/mosfet
-TC4429 have input impedance very large,it need current provide (current static) from power supply
-Two BJT/mosfet have input impedance smaller but it is classB => not need current provide from power supply (current startic very small)
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Last edited by hien.t.nguyen; 11th March 2012 at 11:32 PM.
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Old 12th March 2012, 12:12 AM   #349
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The 2092 can drive 1amp5, the 4420 can drive 6 amps.
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Old 12th March 2012, 06:01 AM   #350
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Thank's to both of you guy's.cheer's....
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