Electronics > Beginners

Transformer specs. (Answered)

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xavier60:
The elimination of diode voltage drop with the use of the LT4320 and four mosfets will make the 2 x 15V transformer more likely to maintain regulation at full output voltage and current.

MUDGEL:
Thanks very much for your help everyone. To those for technical help and others for helping a newbie set more realistic goals.

spec:

--- Quote from: mariush on November 17, 2018, 03:35:21 pm ---if you want to make something fancy, you can replace the bridge rectifier with a LT4320 and four mosfets : https://www.analog.com/media/en/technical-documentation/data-sheets/4320fb.pdf

Saves you around 8-10 watts of heat when you're close to 5A of output, and around 1-2v of voltage drop (that would be across the diodes in the rectifier).
--- End quote ---

Hi Mariush,

That MOSFET driver chip is pretty neat- thanks for posting :-+ Have you ever used one. If so, are they well behaved?

spec:

--- Quote from: MUDGEL on November 18, 2018, 05:31:31 am ---Thanks very much for your help everyone. To those for technical help and others for helping a newbie set more realistic goals.

--- End quote ---

No sweat from me :)  and good luck with your power supply, whichever approach you decide on

mariush:

--- Quote from: spec on November 18, 2018, 06:10:06 am ---
--- Quote from: mariush on November 17, 2018, 03:35:21 pm ---if you want to make something fancy, you can replace the bridge rectifier with a LT4320 and four mosfets : https://www.analog.com/media/en/technical-documentation/data-sheets/4320fb.pdf

Saves you around 8-10 watts of heat when you're close to 5A of output, and around 1-2v of voltage drop (that would be across the diodes in the rectifier).
--- End quote ---

Hi Mariush,

That MOSFET driver chip is pretty neat- thanks for posting :-+ Have you ever used one. If so, are they well behaved?

--- End quote ---

I didn't test one PERSONALLY, but several members on this forum have tested it and had only good things to say about it (at least from what I remember reading on forum). You'll also find plenty of other reviews on various forums about it, from memory pretty much all comments were positive (minus the comments about the price)

It is a Linear part (they were bought by Analog Devices) and Linear parts were even before more expensive compared to parts from other manufacturers, but they're also good parts with good to very good documentation through datasheets and/or application notes.

I suspect the part isn't more popular because of its limitation: it supports maximum 72v AC ... so it kinda sucks that you can't use it on mains 110v AC or 230v AC but for your needs, to convert 30-40v AC to DC, it would be perfectly suitable.

A lot of people used these to replace bridge rectifiers in older class AB audio amplifiers - those extra 1.5v-2v can make a difference there if the transformer used or the bulk capacitors are undersized. Can add a few watts of audio power in the end.

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