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5th February 2011, 11:46 PM
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#1 |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Ringing on class d output inductor.
I am getting around 35 volts overshoot then ringing on my class d output inductor.
Is there any way to reduce this ? 
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http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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6th February 2011, 06:50 AM
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#2 |
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diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
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is this after inductor?
could be that core is saturated. was this with any input signal? |
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6th February 2011, 01:25 PM
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#3 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
I am using a 16 amp indcutor so it shouldnt be saturating. The power supply is only a 2 amp supply. This was without an input signal.
__________________
http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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6th February 2011, 02:28 PM
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#4 |
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diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
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peak current comes from caps, 2a is a lot from that point of view. can you post after inductor, am thinking cross-conduction could be going on, or bad layout/inductive elements, if you have any resistors before fets(i don't think so)
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6th February 2011, 02:50 PM
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#5 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
Deadtime is 125nS, I tried 25ns but it made no difference to the problem. The mosfet gates have a 10R before them. I put two inductors in series just to try it and there is a slight improvement. I have ordered a 28 amp inductor to see if that helps. The inductor gets very hot around 120 degree C.
__________________
http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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6th February 2011, 03:44 PM
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#6 |
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diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
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really, that hot?
i cant say that inductor is saturating, but it is a possibility could be that it is wrong material what is the inductance? and switching freq? load connected? |
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6th February 2011, 03:54 PM
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#8 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
Odd thing is my supply is just a bench supply that gives out 2 amps so I cant see why any overcurrent is being triggered unless it is drawing very narrow pulses from the smoothing capacitors.
__________________
http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software. |
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6th February 2011, 03:57 PM
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#9 | |
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diyAudio Member
Join Date: Apr 2008
Location: Carlisle, England
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Quote:
BOURNS JW MILLER|2305-V-RC|TOROIDAL INDUCTOR | Farnell United Kingdom
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6th February 2011, 04:01 PM
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#10 | |
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diyAudio Member
Join Date: Sep 2005
Location: in Slovenia :)
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Quote:
what material did you use |
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