I have this circuit attatched.
The datasheet says the mosfet IRF4905 is 74A max current, but when I use only 5A its getting as hot as 80~90º celsius.
Even without heatsink I was suppose to handle more than 5A.
Any idea?
Where did you get that circuit?
I'm guessing you aren't turning the MOSFET fully on.
The transistor looks like it might be very unhappy in that circuit. Is your schematic accurate?
Read here while we wait:
a7
The gate source is fully on. I know its not correct, but even if I connect GATE direct (whithout) resistor to the VCC, the over-heat problems keeps happening..
I've heard about fake Mosfets..
If the gate is connected to the source and both are connected to 12V, then the MOSFET should be completely OFF and it should not get hot.
If it's getting hot then the MOSFET is burned out
This is the correct circuit
love this part
short circuit in 3,.. 2,.. 1,..
Sorry! That was a misunderstood from my side... Its a p-channel mosfet.
Well.. when I connect the gate to the GND, it turns the mosfet on and then the heat problem begins,.
What is the load?
Hello, Kolaha, WHY YOU LOVE THIS PART?
A dummy load for testing "creating" a 5A load simulation.
A 100 Watt, 2.4 ohm resistor?
Updating my squematic...
Heres the right..
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If this is what you have done it should not get hot.
If it does than I suspect the MOSFET is damaged.
OK so it's a varable load, if you connected the circuit like I show in post #14 it should not get hot
Yes it is, the only difference is that there is a pullup resistor from gate to VCC
Are you using 12V or 24V?
Your load says 24V and 6A
What are you talking about?
Due to people like you, the knowledges in the world are not enough
Did you see that R5 is connected to gate? to pull it up? What the %%%% are you talking about?