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Old 19th July 2011, 07:53 PM   #11
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using gate buffer like a NPN ? or like another driver ( irs2110 or somethin like that) ?
also i changed the gate resistance.. 11.3V /10ohm = 1.13A = too much for the Ho output, i'll put a 47ohm
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Old 19th July 2011, 07:55 PM   #12
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Old 19th July 2011, 10:04 PM   #13
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interresting.. for HO you put Vb for supply voltage referenced to Vs ?
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Old 19th July 2011, 10:23 PM   #14
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Is negative end of creg connected to com ?
There dsoesnt seem to be a red dot on that connection.
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Old 19th July 2011, 10:29 PM   #15
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Quote:
Originally Posted by philuknow View Post
using gate buffer like a NPN ? or like another driver ( irs2110 or somethin like that) ?
also i changed the gate resistance.. 11.3V /10ohm = 1.13A = too much for the Ho output, i'll put a 47ohm
I would stick with 10R. Its not as simple as 11.3v/10r as you are essentially charging up the gate capacitance. The rise time is pretty quick so the current is not taken for long.
If you start putting large gate resistors in there you will get slower rise and fall times and risk shoot through.
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Old 19th July 2011, 10:46 PM   #16
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yeah i know im charging a cap.. Ic = Io e^(-t/RC)
im not that dumb :P but the Io would be too high with a 10ohm.. i'd need at elast 15 or something like that..
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Old 19th July 2011, 10:47 PM   #17
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also, yes Creg is connected to com.. my bad, thx

Last edited by philuknow; 19th July 2011 at 11:04 PM.
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Old 19th July 2011, 11:08 PM   #18
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Quote:
Originally Posted by philuknow View Post
yeah i know im charging a cap.. Ic = Io e^(-t/RC)
im not that dumb :P but the Io would be too high with a 10ohm.. i'd need at elast 15 or something like that..
So why do IR suggest 10R in their datasheets ?
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Old 19th July 2011, 11:11 PM   #19
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on that one.. you got me haha i guess it is because its for a really short time as you said..
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Old 20th July 2011, 06:08 AM   #20
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Quote:
Originally Posted by philuknow View Post
interresting.. for HO you put Vb for supply voltage referenced to Vs ?
HO drives IN1,2
Vb is also on Vcc
And Vs is connected to GND

So, you take the same supply lines for this buffer as IRS uses, Vb, Vs for upper one, Vcc and Com for lower one, and you drive each buffer IN1,2 via resistor from HO and LO respectively. Source and sink I have connected together, going to gate resistor as it would if there were no buffers (I did it as a mod, after I had boards already made). Now you do need to drive this buffers instead of fets, but at >550kHz, IRS only gets warm, instead of super hot (with this kinda big gate charge fets)
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