Electronics > Beginners

A niche chip (LT4320) for mains powered AC -> low volt DC "linear" based psu ?

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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   
--- End quote ---
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?

--- End quote ---

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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