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#501 |
diyAudio Member
Join Date: Aug 2006
Location: Texas
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Looks good so far even with an IRF510, which makes it far faster. I was using the wrong lytic in my simulation. The 1MHz resonance also seems to be from the SMPS.
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#502 |
diyAudio Chief Moderator
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IRF9630 it could use, not IRF630, thats for the negative polarity. Termination lytic should not be low ESR.
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#503 |
diyAudio Chief Moderator
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No problem pretty soon then and its just makeshift. You will test again in your prototype PCB layout. My sim gives 133 deg phase margin at gain=0dB open loop analysis with the original TO-247s and 0.3R ESR 5nH ESL assumed terminal cap parasitics. It never resonated on its dedicated board. Try use no wimpy MOSFET if you will leave it open to user hot-rod. You will sort it out, no worries.
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#504 |
just another
diyAudio Moderator
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Any intelligence I may appear to have is purely artificial! Photography (another hobby) |
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#505 | |
diyAudio Member
Join Date: Nov 2012
Location: Cognac
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#506 |
diyAudio Member
Join Date: Aug 2006
Location: Texas
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The IRF510 can handle at least 20W. The main thermal hazard is not FET power, but inadequate sinking, which will be equally destructive for IRF510 and IRF240. Considering this I don't see a point in using TO-247 devices. They are slower and probably not even more stable than the IRF510. With good sinking the IRF510 in this design can handle more than 1A of current.
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#507 |
diyAudio Moderator Emeritus
Join Date: Sep 2002
Location: Germany
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The Lego piece you can use has been tested and proven to work OK.You have permission of the author to use his tested and working design. Why loose time questioning the size of the original parts ? The MOSFETs are not expensive and with TO247 you won't need heatsinks with low current. You could click this Lego piece on your Lego piece and test and measure. Maybe it is because I am a builder and have never simulated anything but things seem to delay without necessity. Sorry but, as said before, IMO focus should be on completing this design to a complete working device that can be used in 99% of cases in everyday life. For this reason I will focus on Project16's design. Good luck with the project, the topology is promising.
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It's only audio. Member of the non modular PCB design committee Last edited by jean-paul; 10th September 2015 at 07:01 AM. |
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#508 | |
diyAudio Chief Moderator
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#509 |
diyAudio Member
Join Date: Aug 2006
Location: Texas
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If there is any significant pulsing in a shunt regulator, then it's already broken. It is straightforward to set operating points according to thermal limits. Am I missing something? A drain resistor should be enough to prevent FET destruction in the prototype.
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#510 |
diyAudio Chief Moderator
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The SOA curves for power MOSFETS are usually given in pulsed current durations since they are made for switching applications primarily in mind. Thus their constant power abilities should not be based on their 25C case temperature pulsed current spec in the data sheet. That's what I am saying.
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