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Power FETs [message #98057]

Sat, 26 October 2024 14:58

gofar99
Messages: 1957
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

Hi, has anyone used N channel enhancement MOSFETS as a CCS?

Good Listening
Bruce

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Re: Power FETs [message #98059 is a reply to message #98057]

Sun, 27 October 2024 09:28

Wayne Parham
Messages: 18796
Registered: January 2001

Illuminati (33rd Degree)

I haven't, but that does sound like a good idea. Seems like I remember seeing some schematics for just such a thing. Please do report back what you find if you experiment with that.

I've only designed with traditional power transistors, for high-current outputs, high-voltage outputs or a combination of the two. Those applications are kind of simple. I drive an automobile spark plug coil with a PNP power transistor, for example. That's basically the same approach as using one for a flyback transformer.

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Re: Power FETs [message #98061 is a reply to message #98059]

Sun, 27 October 2024 20:24

gofar99
Messages: 1957
Registered: May 2010
Location: Southern Arizona

Illuminati (5th Degree)

HI I have seen plenty using depletion MOSFETs, but none with enhancement ones. I have lots of the the enhancement ones and the others are still a few $$ to buy. Another thing I noticed was that the depletion ones have relatively high Rd-s compared to the enhancement ones roughly a 10 to 1 ratio. It would seem to make the enhancement ones better as a CCS.

Good Listening
Bruce

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