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| Interesting failure of buck converter |
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| Fraser:
Excellent news :-+ So you think thermal runaway is the issue ? Fraser |
| mikeselectricstuff:
--- Quote from: Fraser on May 28, 2019, 04:14:10 pm ---Excellent news :-+ So you think thermal runaway is the issue ? Fraser --- End quote --- Not runaway - I'm pretty sure that it was the heat from the converter that was pushing the diode over the edge. |
| Jay_Diddy_B:
Hi Mike, I had a look at the datasheet: That is not a lot of margin when operating from 48V supply. I also think it is telling that the do not present a data when operating at 48V on the datasheet. They show scope shots operating into a short with 43V input and lots of data at 12, 24 and 32V. They also show 50V input capacitors. I would want to see 20 or 30% margin. I know that they do say 'Operating input voltage from 5.5 V to 48 V' You might want to take a page out photonicinduction's playbook and turn one up till it pops. :D Regards, Jay_Diddy_B |
| mikeselectricstuff:
Unfortunately there aren't many small 48V converters like this at sensible prices - I'd seen that chip used in another big installation with several hundred nodes, so was fairly happy using it. Something I was concerned about, and did test for, was whether overvoltage transients caused by connecting & disconnecting the supply caused issues, but it seems fine. |
| thinkfat:
I think I'm going to try this on one of my LMR14030 based buck converters. I'm guessing it'd show a similar failure if I drive the input voltage high enough. That's going to be interesting to watch. |
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