Photo voltaic buck converter

I am currently designing a buck converter for a Photo voltaic panel. The Voc of the panel is 22V and I want to use it to charge a car battery. I want to use a p or n channel mosfet as the switch. My problem is that if I use a p-channel the Vgs voltage will be exceeded by the Voc of 22V. And if I use a n-channel the pv voltage might drop to low and the Vgs will be to low for the mosfet to work.

if I use a p-channel the Vgs voltage will be exceeded by the Voc of 22V

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This seems to be a problem of the simple circuit you imagine rather than of the P-FET as such. There are always means to drive
a suitable voltage to a MOSFET, independant of the converter toplogy.

if I use a n-channel the pv voltage might drop to low and the Vgs will be to low for the mosfet to work.

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i am not clear... which type n-channel MOSFET makes the Vgs to drop?
depltion or enhancement?

dinaa89 said:

if I use a n-channel the pv voltage might drop to low and the Vgs will be to low for the mosfet to work.

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i am not clear... which type n-channel MOSFET makes the Vgs to drop?
depltion or enhancement?

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I want to use a gate driver that uses the solar panel as the source. My problem is when the solar panel's voltage drops that the gate driver will not be able to supply a sufficient Vgs.

Added after 2 minutes:

FvM said:

if I use a p-channel the Vgs voltage will be exceeded by the Voc of 22V

Click to expand...

This seems to be a problem of the simple circuit you imagine rather than of the P-FET as such. There are always means to drive
a suitable voltage to a MOSFET, independant of the converter toplogy.

Click to expand...

Is there any specific gate drivers that I should look at? Woould you recommend a n-channel or p-channel FET.