Electronics > Beginners

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

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BravoV:

--- Quote from: Bored@Work on September 24, 2013, 03:57:24 pm ---The first trap is in the first picture of the datasheet. Already postd above

It says DC to 600Hz, but that requires the LT4320-1, not the LT4320 as shown in the picture.

--- End quote ---

C'mon, its just a typo.

Assuming it will be used on mains stepped down using transformer at 50 or 60Hz as most of the cases, whats wrong with LT4320 even though it is designed for DC up to only at 60Hz ?

BravoV:
digsys, eagerly to hear the results from you, thanks !  :-+

johansen:
a close look at the datasheet suggests that they charge those mosfets up with some kind of onboard silicon capacitive voltage doubler.

at a maximum current of 800uA, dropping to 300uA once the fet gets to 5 volts on the gate
and discharge of 1.x mA
bottom gate pull up is 6mA, pull down is 12

you will need a pnp assisted turn off at a minimum.

Bored@Work:

--- Quote from: BravoV on September 24, 2013, 04:19:45 pm ---Assuming it will be used on mains stepped down using transformer at 50 or 60Hz as most of the cases, whats wrong with LT4320 even though it is designed for DC up to only at 60Hz ?

--- End quote ---

Nothing, if you only use it up to 60 Hz. But if you happen to e.g. work in a 400 Hz environment it can cause you some grieve.

Linear seems to get a bit sloppy with their datasheets.

digsys:

--- Quote from: johansen ---a close look at the datasheet suggests that they charge those mosfets up with some kind of onboard silicon capacitive voltage doubler.

--- End quote ---
At 50/60Hz (even 600Hz) that's heaps of time ! I'm more interested on how they work out Vin-Vout / current direction sense / control.
That's always the "tricky" part !!

--- Quote from: johansen ---you will need a pnp assisted turn off at a minimum. 
--- End quote ---
not sure what you mean ???

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