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Class D Switching Power Amplifiers and Power D/A conversion

problem with hip4082
problem with hip4082
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Old 21st June 2011, 11:54 AM   #1
chaitanya2k6er is offline chaitanya2k6er
diyAudio Member
Join Date: Jun 2011
Default problem with hip4082

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..
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File Type: pdf fet drive.pdf (5.6 KB, 132 views)
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Old 21st June 2011, 03:26 PM   #2
ChocoHolic is offline ChocoHolic  Germany
diyAudio Member
Join Date: Dec 2003
Location: Munich
The problem might not be the HIP, but...
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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Old 21st June 2011, 08:34 PM   #3
nigelwright7557 is offline nigelwright7557  United Kingdom
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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.
Murton-Pike Systems PCBCAD51 pcb design software. http://www.murtonpikesystems.co.uk
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