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Old 28th January 2010, 05:14 AM   #1
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Default IRS2092 Amp Design Review

Hello all,

I've been working on a design for a Class D Amp using the IRS2092 to drive a 1Ohm Subwoofer load. I was hoping I could get some feedback on it from some people that know more than me, as this is my first design. Thanks a ton to Eva, Mag, and all the others that I've benefited from while reading through these forums.

Currently I'm laying out the PCB. Wish PADS had an auto-place for some of the small resistors :P

More information on the project can be found here: http://beaversource.oregonstate.edu/...44x200914/wiki
The goal is to eventually get this amp above 500W.

Thanks!

Brent Scrivner
Attached Files
File Type: pdf design.pdf (42.5 KB, 829 views)

Last edited by brent113; 28th January 2010 at 05:19 AM.
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Old 9th February 2010, 04:35 PM   #2
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Default PCB Layout

I got the layout finished. I've attached the CAM files and PDF versions of the layers.
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File Type: zip amp_cam_layers.zip (222.3 KB, 369 views)
File Type: zip amp_pdf_plots.zip (412.5 KB, 474 views)
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Old 9th February 2010, 05:03 PM   #3
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When you finished ,please mail me detail picture,I'll order one for test if cheaper.but I think about can it deliver out 500W/4ohm/1%THD,PCB route not perfect.like IRAUDAMP7s.
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Old 9th February 2010, 11:36 PM   #4
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hello Brent,
have you already tested your prototype?
At first sight, your design looks good ,hope in real life test you wont have problems.
I had alot of protections problems , maingly in layout , but now it is ok .
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Old 9th February 2010, 11:42 PM   #5
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just an uncommon value of your high side feeding resistor of 47 ohms.Maybe it is ok , but in my amp i use 4r7 or 1 r.
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Old 10th February 2010, 12:19 AM   #6
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Thanks for the optimism. I just ordered the pcb about 15 hours ago. Good catch on the 47R, made me check my parts list. I actually ordered a 4r7, that was just a typo.

I'm not looking forward to testing the protections. Thinking of putting the protection signal connecting diode on headers for easy removal
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Old 10th February 2010, 01:22 AM   #7
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Gate drive traces/source traces are far from gate driver chip and no continuous ground plane.........routing is not optimised.
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Old 10th February 2010, 01:34 AM   #8
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Hmm. Don't know enough about this to tell if that is going to be a show stopper. How badly do traces that long affect the output. If I dropped the carrier frequency down lower could that help mitigate that problem?
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Old 10th February 2010, 06:12 AM   #9
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Quote:
Originally Posted by brent113 View Post
Hmm. Don't know enough about this to tell if that is going to be a show stopper. How badly do traces that long affect the output. If I dropped the carrier frequency down lower could that help mitigate that problem?
Why you guys never CARE TO READ application notes related with that driver chip and a basic understanding of RF and switching electronics is must prior to any adventure of this much calibre.


The forum is FILLED with numerous examples, seems you havent done your homework.
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Old 10th February 2010, 06:51 AM   #10
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I have read all of the related application notes. Care to make any suggestions for improvements? I do not have a fundamental understanding of RF and switching electronics as they are not currently in my major. I will be studying those in years to come.
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