Author Topic: Buck converter question  (Read 204 times)

Offline dru

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Buck converter question
« on: November 18, 2022, 06:10:52 AM »
Hello,
I'm working on a buck converter for a QCW coil. I have a schematic I plan on using, but I'm wondering if I may be doing something wrong. For the MOSFET or IGBT that is being driven by my microcontroller, is it correct that this should be an N channel device? I have gotten satisfactory ramps when running sims, but it was always necessary to drive the MOSFET at vcc to get it into linear region. This makes sense because it is in a high side configuration. What are some practical methods of amplifying the low voltage signal from my mcu to vcc + ~5v or so? Does it make sense to use a high side driver for this?

Offline davekni

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Re: Buck converter question
« Reply #1 on: November 19, 2022, 03:36:20 AM »
Quote
For the MOSFET or IGBT that is being driven by my microcontroller, is it correct that this should be an N channel device?
NFETs have higher current ratings for a given cost and drive power.  A PFET is possible to use.  IGBTs aren't available in P variety AFAIK.

Quote
Does it make sense to use a high side driver for this?
Yes, that is what high side drivers are designed to do.
David Knierim

Offline dru

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Re: Buck converter question
« Reply #2 on: November 19, 2022, 08:03:56 AM »

NFETs have higher current ratings for a given cost and drive power.  A PFET is possible to use.  IGBTs aren't available in P variety AFAIK.


Yes, that is what high side drivers are designed to do.
Great, thank you Dave!

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Re: Buck converter question
« Reply #2 on: November 19, 2022, 08:03:56 AM »

 


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