Electronics > Projects, Designs, and Technical Stuff

Can be cheap DC/DC bricks used to power gate driver ?

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Miyuki:
Hi folks,

just a quick question, will common DC/DC brick work reliable as insulated gate power ?
They commonly dont have much specifications about them. Just DC voltage and some vague capacity.

Will they work with 400V transients at output side / high side driver ?

wraper:

--- Quote ---will common DC/DC brick work reliable as insulated gate power ?
--- End quote ---
They will work as power source for gate driver but not as gate driver itself.

--- Quote ---Will they work with 400V transients at output side / high side driver ?
--- End quote ---
Look at isolation voltage spec. Also if there is high isolation capacitance between primary and secondary side, it may be troublesome in some applications.

Miyuki:

--- Quote from: blueskull on March 19, 2020, 05:53:07 pm ---DC/DC bricks designed for gate driving applications have CMTI ratings. Usually specified in kV/us or V/ns.

--- End quote ---
Oh thanks I see them in catalogue, but they are way more expensive than common ones :/

T3sl4co1l:
Yes but...

- The above. Needs high immunity. Not hard to achieve, but if it's not rated, who knows?  Also, if you're using GaN, I would definitely want to see a rating, since the dV/dt is just so high.

- Isolation is usually poor, functional 1kV for example.  This may be technically adequate, but it may also lead to poor reliability versus a proper reinforced barrier.

Expect to pay more for parts with these ratings, or by solving it yourself with a discrete supply (and probably custom magnetics).

Tim

Miyuki:
I dont want to use something exotic like GaN, but even today IGBTs can switch pretty fast (like that Infineon H5 ones can get over 20 V/ns)

I wanted to avoid discrete supply, that is why I asked, but still want to keep it cheap
If discrete supply will be only reasonable way, I still want to avoid custom magnetic if possible

As I look to general purpose ones without immunity they tend to have 5 to 10 times higher capacity between sides

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