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Old 2nd February 2011, 11:46 AM   #51
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Quote:
Originally Posted by luka View Post
What?? I hope you didn't use P channel!!!
This is HI side driver also, that this means is, that it driver ONLY N channel fets, which are far better then P.
No i used N channel for both.. i was just wondering
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Old 2nd February 2011, 11:49 AM   #52
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Quote:
Originally Posted by Boudemaniak View Post
Ah, i see now that internally a 6V zener is connected to VAA and VSS so the 2.7k resistor is the dropper resistor..
Right, but I like to use external, since those are now for any sort of protection only
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Old 2nd February 2011, 12:54 PM   #53
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Some extra information:

Both fets are open. So if i remove 1 fet, there is no problem. Even the chip will only drain about 10mA.

When both of them are installed i have a big short and the chip will drain 300mA. It can't be the fets since i placed in new ones. This must be a chip problem, but what?

What drives the chip to open them both? I hope someone ever had the same problem
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Old 2nd February 2011, 01:06 PM   #54
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unless IC is damaged, it can't open both at the same time, it has circuit to prevent this... but what is has it dead time, which I would set for now to max
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Old 2nd February 2011, 02:00 PM   #55
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Quote:
Originally Posted by luka View Post
unless IC is damaged, it can't open both at the same time, it has circuit to prevent this... but what is has it dead time, which I would set for now to max
That's what i thought! But i already replaced the IC so this shouldn't be the case.

Measuring between pin 9 and 10 is about 9V, so according to the table this is way too high for even the DT1 (25ns).

Im gonna make the dead time max, then i'll report back

Update: still nothing, but this is probably because the low side fet is still missing. Im still afraid though that it will give a short again!
Update2: Indeed it does :P

Last edited by Boudemaniak; 2nd February 2011 at 02:20 PM.
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Old 2nd February 2011, 03:02 PM   #56
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Hmm, seems like the chip keeps blowing the fets! This shouldn't happence since i recently put in a new chip. When i measure over pin 15 and 13 without the fets, i have no voltage. Even only pin 15 to gnd is 0V, but the resistor is placed correctly. Must be the chip i guess?
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Old 2nd February 2011, 04:15 PM   #57
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Quote:
Originally Posted by Boudemaniak View Post
That's what i thought! But i already replaced the IC so this shouldn't be the case.

Measuring between pin 9 and 10 is about 9V, so according to the table this is way too high for even the DT1 (25ns).

Im gonna make the dead time max, then i'll report back

Update: still nothing, but this is probably because the low side fet is still missing. Im still afraid though that it will give a short again!
Update2: Indeed it does :P
yes 9v means you are on lowest DT setting. You need both fets in the circuit! maybe your freq is set too high, that would bring consumption way high
what are you resistors and caps for freq setting?

And as long as you have some resistors in series with power lines, there won't be any problems
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Old 2nd February 2011, 04:17 PM   #58
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Quote:
Originally Posted by Boudemaniak View Post
Hmm, seems like the chip keeps blowing the fets! This shouldn't happence since i recently put in a new chip. When i measure over pin 15 and 13 without the fets, i have no voltage. Even only pin 15 to gnd is 0V, but the resistor is placed correctly. Must be the chip i guess?
without fets you won't be able to measure the voltages, since they are a must for circuit to work

Capacitor between 13 and 15 will charge only when lower fet open
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Old 2nd February 2011, 08:01 PM   #59
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Quote:
Originally Posted by luka View Post
yes 9v means you are on lowest DT setting. You need both fets in the circuit! maybe your freq is set too high, that would bring consumption way high
what are you resistors and caps for freq setting?

And as long as you have some resistors in series with power lines, there won't be any problems
I looked it over and i cant find any reference on how to set the oscillator. It's standard 800kHz.

Theze are my values:
Click the image to open in full size.

Quote:
Originally Posted by luka View Post
without fets you won't be able to measure the voltages, since they are a must for circuit to work

Capacitor between 13 and 15 will charge only when lower fet open
I know i need the fets, but when i put in a working fet (no matter what side) it will blow. Then i remove it and measure it, it has a short between drain and source. I've blown about 5 fets now hehe

SO the high side driver isn't broken either, so what is? Something must be wrong? I only have 1 new IRS2092 left so i must be careful


Im getting dizzy, time to get some sleep i guess
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Old 2nd February 2011, 08:14 PM   #60
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you really need this PDF, other one is totaly useless

http://www.irf.com/technical-info/appnotes/an-1138.pdf

here you will find some values... I have found that because I have such fets and all, I have diffrent values, so expect to have diffrent freq., so don't go crazy with values

You set is by resistor an 2 capacitors

What fets are you using?
maybe you should remove those big capacitors for now, since those provide the current to do that

show me schematic that you have now, I won't check the pcb if everything is connected where it should be though
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