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Old 31st October 2010, 06:54 AM   #21
luka is offline luka  Slovenia
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you have problems with IRS supply??
For Vaa and Vss I have 470uF for each
But I still don't understand why won't it work with 4227's and damn good gate drivers
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Last edited by luka; 31st October 2010 at 07:01 AM.
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Old 31st October 2010, 03:44 PM   #22
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But I still don't understand why won't it work with 4227's and damn good gate drivers
It will work with 4227 as that is what I am using.

The VCC supply also charges up the VB supply when vs is at zero volts.
This takes a chunk out of the vcc supply and resets the 2092.
Adding a 47uf to the vcc supply fixed this problem.
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Old 31st October 2010, 03:54 PM   #23
luka is offline luka  Slovenia
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Quote:
Originally Posted by nigelwright7557 View Post
It will work with 4227 as that is what I am using.

The VCC supply also charges up the VB supply when vs is at zero volts.
This takes a chunk out of the vcc supply and resets the 2092.
Adding a 47uf to the vcc supply fixed this problem.
I don't understand, first it didn't work with 4227's, and now it does? And you just added 47uf?
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Old 31st October 2010, 03:58 PM   #24
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I don't understand, first it didn't work with 4227's, and now it does? And you just added 47uf?
Yes. I can only guess there was something wrong with my 12 volt supply.
Adding 47uf instead of the 10uf was enough to get rid of the 12 volt glitches.

What was happening was the the first HO pulse reset the 2092.
This happened because the vb took power from the 12 volts through the diode and 22uf and this caused the 12 volts to drop out a volt or so and so resetting the 2092.

Might just have been my 12 volt supply was poor and wasnt decoupled enough.

Last edited by nigelwright7557; 31st October 2010 at 04:01 PM.
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Old 31st October 2010, 04:06 PM   #25
luka is offline luka  Slovenia
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ok, so then tell me what resistors and caps you have to set 2092, so I can check what is diffrent from my

Also, what is your supply voltage? and you drive 4227 directly? What Rgate do you use?
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Old 31st October 2010, 04:11 PM   #26
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ok, so then tell me what resistors and caps you have to set 2092, so I can check what is diffrent from my

Also, what is your supply voltage? and you drive 4227 directly? What Rgate do you use?
I have used the circuit in irs2092 datasheet.

Only difference is I have used maximum deadtime and changed the vcc 10uf to 47uf.

Rgate are 10R.

I use +/- 35 volts supply.
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Old 31st October 2010, 04:15 PM   #27
luka is offline luka  Slovenia
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same freq setting elements?
you are talking about elements as for IRAUDAMP5 reference design?
can you use higher voltage? I always had +/-60
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Old 31st October 2010, 04:22 PM   #28
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same freq setting elements?
you are talking about elements as for IRAUDAMP5 reference design?
can you use higher voltage? I always had +/-60
Download the datasheet for the irs2092.

Not the application note or iraudamp5.

I use same freq elements.

I havent tried a higher voltage yet.

Due to the TO220 package I am having trouble getting more than 5 amps out of the pcb tracks, so currently I cant get more than 100 watts without using 2 oz copper. WIth 2 oz copper i can get 400 watts.
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Old 31st October 2010, 04:27 PM   #29
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same freq setting elements?
you are talking about elements as for IRAUDAMP5 reference design?
can you use higher voltage? I always had +/-60
Give me your email address and I will send you the pdf for irs2092.
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Old 31st October 2010, 04:29 PM   #30
luka is offline luka  Slovenia
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Quote:
Originally Posted by nigelwright7557 View Post
Give me your email address and I will send you the pdf for irs2092.
you can click icon down below for my email, but I have pdf of 2092 from IR, so I see datasheet
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