Yes.Can a voltage exist without current?
SHOW YOUR SCHEMATIC!!!
First of all, using a BJT is not going to magically boost the gate voltage. The IRF740 needs up to 4V just to START to turn on. Thus, you're going to need something like 10V from somewhere; it's not going to come out of the BJT, and 5V is probably not enough to turn the MOSFET fully on.
If you don't have anything higher than 5V, then this MOSFET is just not going to work. You can spend under a dollar (or Euro, or whatever you use) and get the proper part.
1) Without your schematic, there's no way to answer.
2) Gate current matters when you're dealing with high speed switching. For your application, it's not too important.
Thanks! Great examples that I never really thought aboutHi
Yes.
Think about it: Your power outlet will have voltage even if you don't connect a vacuum cleaner.
The same is true for a car battery.
Klaus
Won't cutting the 5V to the gate turn it off? I might have missed the metaphor.When you get further along you will find out that
it is as important, or more important in some cases,
to turn the MOSFET off.
Don't build yourself a "one legged man in an a$$
kicking contest".
Since your output and input voltages are the same
(5V) all you really want is to "buffer the current".
Like a 5V-output-capable MOSFET driver? There
ought to be some for driving "logic level FETs"
and these ought to have decent control of
shoot-through current. Find one rated for 6-10A
peak and it ought to be fine for 1A continuous.
Interesting idea, worth a try. (But if it was me, I would have already bought and installed a logic-level MOSFET).Hi,
The OP states he has a non_logic_level Mosfet .... and 5V at VGS won't drive enough motor current.
He also states he want's to use this Mosfet.
So for me the only solution is to drive the gate with higher voltage.
To make the microcontroller to output a square wave ...and connecting a few D, C and an R ..
could generate a 9.4V gate voltage.
Klaus
How do you get a doubler with non inverted output and common ground ?Hi,
If you don't have 12v then you may use a voltage doubler using diodes and Cs.
Klaus
I am curious, you have an example circuit ?Hi,
there are many ways:
The simple: one pin, R,C, D circuit is this: https://www.radiolocman.com/shem/schematics.html?di=164710
(I recommend to use BAT54 diodes)
But if you can afford a second pin, or some analog switches you may improve the circuit and it´s behaviour.
Klaus
No, I wrote:You cant mean this, right ?
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