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Are logic level gate mosfet slower than regular mosfet?

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spec:

--- Quote from: exe on November 01, 2018, 10:43:21 am ---
--- Quote from: spec on November 01, 2018, 10:26:39 am ---As you imply, the secret is to establish the sweet spot in a design :)

--- End quote ---

Yeah, but for a one-off device I'd suggest save time and just get the best part. Sort of overkill, but saves a lot of time... and often board space.

I have CSD17313Q2T (that I'm yet to try), but even at 3V drive it gives less than 50mOhm over entire temperature range (hope it's not a "typical performance") and has very good performance in terms of Rds(on) vs gate charge.

There are inexpensive parts with threshold of less than 1V in sot-23 package with quite low Rds(on). Like AO3414. I bought it because it's cheap (yet to try it, don't have a lab at the moment) :). Just threshold voltage can be as low as 0.4V, so be sure driver can pull that low.

--- End quote ---

Hmm, sounds like you have some interesting parts and plans. I would like to see  any circuits that you design. I'm in the same boat as you- no lab facilities at the moment as I'm living in one house, temporarily, while refurbishing another house which does have a large garage and potential for a lab, but I  need approval from the domestic authority for that. :D

exe:

--- Quote from: spec on November 01, 2018, 11:53:14 am ---I would like to see  any circuits that you design.

--- End quote ---

I'm building a four-channel linear lab supply heavily inspired by this one: https://www.eevblog.com/forum/beginners/how-does-blackdog_s-psu-work/ . Basically, I'm taking that design and adding the following features:

1) Digital control
2) Current sinking (but not much, more like 100-500mA)
3) Dual current range (via a switchable shunt)
4) 4 isolated channels
5) graphical display. May be touch control.
6) remote control (probably add this later)
7) very compact, half-rack width
8) switchable output capacitance. This can be a unique feature, haven't seen this before :).
9) probably two channels will be "beefy" (15V 3A), and two will be will low range (both current and voltage), but more precise and with small output capacitor (like 6V, 600mA).

So far I built 6 and half prototypes of power part, now messing up with software part. Since I'm still evaluating different modules, there is no finished schematic yet (don't want to show discarded designs). Also I don't think I'll be able to implement all the features. Current goal is to finish schematic, make one channel evaluate it, learn from mistakes, and will see. Probably, I'll have to give up on some ideas.

spec:
Wow, quite a project. As I said, keep us informed about progress. :)

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