IRS2092 Amp Design Review

brent113 · 04:19 AM

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

brent113 · 9th February 2010, 03:35 PM

I got the layout finished. I've attached the CAM files and PDF versions of the layers.

greenamp · 9th February 2010, 04:03 PM

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.

odnaizutra · 9th February 2010, 10:36 PM

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 .

odnaizutra · 9th February 2010, 10:42 PM

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.

brent113 · 9th February 2010, 11:19 PM

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

Workhorse · 10th February 2010, 12:22 AM

Gate drive traces/source traces are far from gate driver chip and no continuous ground plane.........routing is not optimised.

brent113 · 10th February 2010, 12:34 AM

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?

Workhorse · 10th February 2010, 05:12 AM

Quote:

Originally Posted by brent113

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.

brent113 · 10th February 2010, 05:51 AM

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.

10th February 2010, 12:22 AM	#7
Workhorse diyAudio Member Join Date: Dec 2004	Gate drive traces/source traces are far from gate driver chip and no continuous ground plane.........routing is not optimised. __________________ It's a fruitless endeavor to try and educate a fool that rejoices in ignorance

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9th February 2010, 04:03 PM	#3
greenamp diyAudio Member Join Date: Jan 2010	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.

9th February 2010, 10:36 PM	#4
odnaizutra diyAudio Member Join Date: Jan 2007	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 .

9th February 2010, 10:42 PM	#5
odnaizutra diyAudio Member Join Date: Jan 2007	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.

9th February 2010, 11:19 PM	#6
brent113 diyAudio Member Join Date: Dec 2009 Location: Oregon	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

10th February 2010, 12:34 AM	#8
brent113 diyAudio Member Join Date: Dec 2009 Location: Oregon	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?

10th February 2010, 05:51 AM	#10
brent113 diyAudio Member Join Date: Dec 2009 Location: Oregon	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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