IRS2092 keeps reetting

[ionutzxpo]

Hello guys,I made a class d amplifier using the IRS2092 driver and when i first power it up it keeps resetting.This is the values for the OCP settings for IRFB5620 mosfets: High side OCP-7K5+2K7
Low side OCP-8K2+2K2
everything on the board seems to be OK.

Thanks! Ionut (Jhonny)

 

[ionutzxpo]

I forgot to say that the ocp is set at 18A trip level for hi side and low side
and please can a moderator modify my title ,i wrote reetting instead of resetting (sorry)

Thanks!

 

[Tekko]

This ic sucks, just too sensitive to board layout :/

You have to get it 100% right for it to work at all.

Copy the IR reference layout straight off and it might work.

 

[ionutzxpo]

I made a year ago the same board but diffrent rezistor values for the ocp and it worked fine the first time

 

[airwavesystem]

power it up it keeps resetting.

Have you connect dummy load when power?
If not,This maybe not the OCP setting problem,i think you need to check another part.....

 

[Reactance]

Hello guys,I made a class d amplifier using the IRS2092 driver and when i first power it up it keeps resetting.This is the values for the OCP settings for IRFB5620 mosfets: High side OCP-7K5+2K7
Low side OCP-8K2+2K2
everything on the board seems to be OK.

Thanks! Ionut (Jhonny)

If you post your scope wave forms we might be ale to help you. but you didn't supply a picture of your board or your diagram.

 

[ionutzxpo]

Problem solved! The problem was that i put 10 ohm 3w rezistors in series with the - and + power leads (precaution not to blow up in smoke at first power up) seems that IRS2092 chip does not like that,i just removed those and the amp power up perfect running at 400khz dead time 45ns OC set at 18A mosfets IRFB5620 ,sund is great!
Thank you all for the support!

 

[nigelwright7557]

I had a problem with the 2092 resetting at high powers.
I just had to scale the OCP and CSH resistors correctly.

I also had trouble with power off thumps and siren sounds with large smoothing capacitors. I had to add a PIC microcontroller to monitor VCC and hold the 2092 in reset if VCC reached 15 volts.

It is a touchy IC to work with, decoupling has to be right and layout kept tight.

 

[ionutzxpo]

Hi guys,I have some overshooting and i don't know how to get rid of it. Can someone help me? This is the pcb

 

[gmarsh]

This ic sucks, just too sensitive to board layout :/

You have to get it 100% right for it to work at all.

Copy the IR reference layout straight off and it might work.

Speaking as an amateur radio operator, I actually love the chip for this reason.

If the user hasn't put much thought into the board layout around the chip, they probably haven't put much thought into the output filter, power supply, and various other things that could cause the resulting amplifier to broadcast over the whole HF radio spectrum.

Copy the IR design. PLEASE.

 

[gmarsh]

Hi guys,I have some overshooting and i don't know how to get rid of it. Can someone help me? This is the pcb http://i957.photobucket.com/albums/ae59/ionutzxpo/pcb_zpsda094341.jpg

Maybe this will give you some perspective:

 

[ionutzxpo]

ok, thanks gmarsh

 

[Deleted member 148505]

Hi guys,I have some overshooting and i don't know how to get rid of it. Can someone help me?

There are couple of guidelines from these IR's application notes. (In case you haven't read them)

http://www.irf.com/technical-info/appnotes/an-1135.pdf

http://www.irf.com/technical-info/appnotes/an-978.pdf

http://www.irf.com/technical-info/designtp/dt97-3.pdf

Goodluck!

 

[werechai1]

Thank you for the job