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Old 21st March 2014, 07:26 PM   #1
ulrisa is offline ulrisa  United States
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Default Class D IRS2092, No power up

Hi all-

I have been working on a project for school for a few months now. In that time I have become very familiar with the IRAUDAMP7S, and it is what my board is based on. I recently had a PCB manufactured for my final version. This version includes a crossover network. The main difference is, I used the stock IRAUDAMP7S originally and I created my own PCB for this part.

It would appear I overlooked the part of the application note about pcb layout when I made the board, and I did not use separate grounding planes. I figured I would get a noisy output but I tried building it anyway. The IRS2092 does nothing when power is applied, no pop, smoke, or ringing. Just nothing.

I checked +VAA (+5.6v), - VSS (-5.6v), VCC (+15v), -B(-50v), and +B(+50v) and they are all what I would expect them to be so it is receiving power but it does not turn on. Is the problem in my reference planes? Could that cause it to do nothing? I have not tried replacing the chip yet as I am trying to find the root cause in case it is dead.

I've attached what the top and bottom layers look like, as you can see there is one very large grounding plane. I am feeling like this is probably it, but I'd like to get some input so I can better figure out what the problem is. The attached pdf can provide a better look at the bottom.

Thanks in advance!!
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File Type: jpg bottom.jpg (217.9 KB, 411 views)
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File Type: pdf bottom.pdf (199.4 KB, 49 views)
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Old 21st March 2014, 09:42 PM   #2
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Do you get oscillation just before the output filter ?
It should be a square wave of 200-400 KHZ.

The irs2092 is hyper fussy about layout.
You should really have copied the IR pcb layout as that works.

2092 is fussy about decoupling and short tracks.
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Old 22nd March 2014, 01:41 AM   #3
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You could check CSD to see if the 2092 is resetting all the time.
If the voltage goes up and down it is resetting for some reason.
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Old 22nd March 2014, 03:10 AM   #4
ulrisa is offline ulrisa  United States
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Okay, I will take a look at those two points when I am in the lab on Monday. Thanks for the ideas! Do you think my lack of separated analog, power, and reference planes could be the problem? Or is it more likely to be something else when the chip does nothing.

I really mean nothing too, lol I would've expected at least a pop or ringing.
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Old 25th March 2014, 06:18 PM   #5
ulrisa is offline ulrisa  United States
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ok guys, I am in the lab currently and your suspicions were correct Nigel, the csd pin is resetting.

These are the voltages I am measuring at my pins.

-5.4 csd
-48 oc
-45 vref
-4.3 comp
+5.9 vaa
-5.9 vss
3.9 csh
11.8 vb
-36 vcc
-50 com
-36 dt

Right now I am looking through the datasheets to see how each one of these is supposed to be set to see if I am missing something.

Anyone that is familiar with the irs2092, are these values okay?

Thanks!
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Old 25th March 2014, 06:28 PM   #6
ulrisa is offline ulrisa  United States
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actually, csd is jumping between +1.2v and -1.2v continually, I accidentally had it switched off and tied to -vss
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Old 25th March 2014, 06:32 PM   #7
ulrisa is offline ulrisa  United States
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Sorry to keep reposting mods, I just had a dumb moment in those measurements lol. So with it switched on LO is -50, HI 0, VS 0 and all of the other values are as I had listed.
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Old 25th March 2014, 07:50 PM   #8
ulrisa is offline ulrisa  United States
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There is no self-oscillation, but I am assuming that that is because the chip is resetting.
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Old 27th March 2014, 09:18 PM   #9
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If the chip is resetting then one of the voltages is probably incorrect.
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Old 30th March 2014, 12:02 PM   #10
kaip is offline kaip  Netherlands
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I dont want to steal this topic, but I have the same problem: irs2092 not starting up, or stuck in reset.
Maybe we have a similar mistake ?

Here is my version:

Click the image to open in full size.

Click the image to open in full size.

TOP:
Click the image to open in full size.

BOTTOM:
Click the image to open in full size.


Maybe one of you can spot an error directly, that would be nice
All my voltages seem to be ok.
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