Electronics > Beginners

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

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digsys:

--- Quote from: ResR ---  I made the PCB design for that chip also with all through hole components, the pcb is 74x69mm in size. 
--- End quote ---
Great. What current are you expecting to run yours at? Have you used it in a project yet?

Phaedrus:

--- Quote from: necessaryevil on December 31, 2013, 04:00:46 pm ---@NANDblog, Pheadrus,

Any recommended docs/books about ac-dc topology for the novice? I'm quite interested.

--- End quote ---


I learned from Wikipedia, Texas Instruments white papers, and talking to engineers. Sorry, can't help with books.

BravoV:

--- Quote from: ResR on December 31, 2013, 05:57:17 pm ---I made the PCB design for that chip also with all through hole components, the pcb is 74x69mm in size.

--- End quote ---

Hmmm.. DIP 8 package, where did you buy that chip ? Just checked LT's shop, the LT4320IN8#PBF or LT4320IN8-1#PBF for the dip 8 still not available yet, and FindChips search results too, no luck.

Although you already have the big cap on the top at your layout there, read the datasheet at "CLoad Selection" section, its recommended to have small caps to complement that big cap above, that are placed really close to OUTP and OUTN pins, probably at bottom right of your pcb layout there, close to the IC.

Edit : Don't forget PCB mounting holes at the four corners.  ;)

tszaboo:

--- Quote from: necessaryevil on December 31, 2013, 04:00:46 pm ---@NANDblog, Pheadrus,

Any recommended docs/books about ac-dc topology for the novice? I'm quite interested.

--- End quote ---
I'm really not an expert on that field, sorry.

digsys:

--- Quote from: BravoV ---Although you already have the big cap on the top at your layout there, read the datasheet at "CLoad Selection" section, its recommended to have small caps to complement that big cap above, that are placed really close to OUTP and OUTN pins, probably at bottom right of your pcb layout there, close to the IC.   
--- End quote ---
One thing I've definitely proven with this IC is - you can't bust it !! It works perfectly well with no / excess compensation, poor layout,
too much / too little filtering etc etc You just can't stop it working ! BUT, keep that extra safety - add noise caps etc etc

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