Electronics > Beginners
A niche chip (LT4320) for mains powered AC -> low volt DC "linear" based psu ?
necessaryevil:
--- Quote from: digsys on January 11, 2014, 12:13:25 pm ---With the FETs I've tested, max 2.5mR RDSon, 15A is a piece of cake. 16-20A and you start to need to think about some heatsinking.
--- End quote ---
Well, I meant the PCBs could handle 15A (calculated, conservative settings)
I use similar mosfets in my design. I did some hand written calculations and I came up with the same conclusion about heat sinking. Nice to have this conclusion confirmed.
digsys:
--- Quote from: necessaryevil --- Well, I meant the PCBs could handle 15A (calculated, conservative settings)
--- End quote ---
Did you use 4oz Copper? Any other "tricks"? Exposed section/over-solder/silver-solder/wire over tracks?
digsys:
--- Quote from: peter.mitchell ---Ok, doesn't particularly matter if you buy the high spec or not, I am more interested in this things limits, i already know mosfets are good high current switches. :P
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OK seems there's a mis-communication here :-). LT4320 is only rated to 60Hz LT4320-1 is rated to 600Hz. I didn't buy the xxx-1
From the datasheet - "Higher frequencies of operation are possible depending on MOSFET size and operating load current"
From my waveforms, I only saw very little degradation on gate drive when I pushed the FETs to 20A+, so I'd say if you stay
under ~10A, the max freq could be QUITE high.
BravoV:
--- Quote from: peter.mitchell on January 11, 2014, 01:11:47 pm ---hey digsys, have you tried it above 600hz?
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Just curious what are you looking for in using this chip way above it's specification ? ::)
peter.mitchell:
--- Quote from: BravoV on January 12, 2014, 09:53:56 am ---
--- Quote from: peter.mitchell on January 11, 2014, 01:11:47 pm ---hey digsys, have you tried it above 600hz?
--- End quote ---
Just curious what are you looking for in using this chip way above it's specification ? ::)
--- End quote ---
Magic, rainbows, world peace, ect...
But seriously, a high current, high speed, low loss rectifier would be amazing for lots of applications.
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