25
Driving a logic level MOSFET with an ATtiny 3224 (thelemmy.club)
submitted 2 months ago* by to c/askelectronics@discuss.tchncs.de
13 comments fedilink hide all child comments
 

I'm tinkering with the ATtiny 2 series (ATtiny 3224). I'm also starting to teach myself about switch mode power and surface mount design. I'm planning to drive two Toshiba SSM6K804R MOSFETs. They are logic level MOSFETs with a 4.5V drive. They have a gate capacitance of 1110pF (1nF).

Even though these are logic level MOSFETs, I think I still need an external gate drive for them for crisp switching above a few kHz. I don't need to try and charge the gate directly with the ATtiny as I would need a 2-300ohm resistor in series to protect the microcontroller and that will slow everything down. Also need a pulldown for the gate.

Can someone please recommend a simple IC or maybe a packaged transistor pair that I can slam the gates with?

Questions/comments/advice greatly appreciated!!

you are viewing a single comment's thread
view the rest of the comments
[–] 5 points 2 months ago (1 child)

I don't know how serious your project is and how much reliability and predictability you need; but regarding

I would need a 2-300ohm resistor in series to protect the microcontroller

I will just say: I have yet to kill an AVR.

I haven't used any gate drivers yet, but I remember an introductory video about MOSFET control that helped me a lot, and at about 7:40 he shows his go-to setup.

And again, I don't know your requirements, but my default logic level MOSFET is the SI2302. It's available from a bunch of different manufacturers, has a threshold voltage less than 1V and can conduct several amps continuously.

  • permalink
  • fedilink
  • source
  • hideshow 1 child comment
    •
  • [–] [S] 2 points 2 months ago

    I'm hoping to end up with a pcb that has the features of an obsolete ecig that my spouse and I prefer. I've probably purchased a dozen of them over the years. The switches always fail.

    Given the politcal climate towards ecigs (What about the children?!!!!?), my particular harm reduction method continues to become more difficult to source. So, I'm just going to future proof things and build my own. I doubt the design will be worth any money so I'll probably open source it if it works.

    So pretty serious about durablility, it would be a tool for daily use. I plan for switches to be on a daughter board so I can just change them out.

    I'll be checking out the video this evening.

    Thanks!

  • permalink
  • fedilink
  • source
  • parent