problem with hip4082

chaitanya2k6er · 21st June 2011, 11:54 AM

hi every one, i am facing a problem in driving a full bridge of MOSFET's with HIP4082. The problem which i am facing is, ringing at the output of FET's (i.e after the output raising from 0 to 50V). I have used the IRLR120N mosfet's in the bridge with an input of 50v. I could be glad if some one helps me out to solve this problem. Please find the attached circuit diagram.
Thanks alot..

ChocoHolic · 21st June 2011, 03:26 PM

The problem might not be the HIP, but...
Layout
Snubbering
Output choke

Search the forum, you will find lots of threads about issues with HF ringing.
Obviously you are not alone, because this is one of the key headaches for class D DIY and in the mean time there is enough information out there to get it right.

nigelwright7557 · 21st June 2011, 08:34 PM

I use a t106-2 core with 2 meters of wire for my class d amp.
I tried power inductors but they just got too hot.

The pcb tracks need to be as short as possible and the circuit well decoupled.

21st June 2011, 08:34 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	I use a t106-2 core with 2 meters of wire for my class d amp. I tried power inductors but they just got too hot. The pcb tracks need to be as short as possible and the circuit well decoupled. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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21st June 2011, 03:26 PM	#2
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	The problem might not be the HIP, but... Layout Snubbering Output choke Search the forum, you will find lots of threads about issues with HF ringing. Obviously you are not alone, because this is one of the key headaches for class D DIY and in the mean time there is enough information out there to get it right.

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