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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
At the duty that is shown (the screen is significantly zoomed in), there is less than 0.5A.
I am wondering if the ceramic 0.1uf bypass capacitor on the FOD3180 is adequate. How can I tell if the FOD3180 is the problem? Could there not be enough gate current available? Why does the problem resolve when the duty increases?
I'm going to reevaluate the input to the FOD3180 and see if the problem is on the input end of the chip as I've been focusing on the output side.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Gate drive ICs should be bypassed with a low ESR electrolytic right next to the IC, a ceramic isn't high enough capacitance. I used 330uF per gate drive chip in my DRSSTCs.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
IamSmooth wrote ...
Steve,
would a polypropelene metallized film be better, or is the electrolyzed good enough?
first put 100-500uF electrlytic in parallel with as large a film type as you have or can fit, lets see if that solves it, steve mcconner is right the gate drive ic suck large charge in shrot time periods so you need to have a cap close .
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Help with cleaning up gate drive to IGBT buck converter
