Why the mosfet IRF520N should control the 12DC motor (it mean the circuit is normal), but should not work in DC 5V motor(0.6A).
inspect the output voltage was low.
Drain-Source Voltage: VDS 100V
Continuous Drain Current: ID 9.2A
Gate-Source Threshold Voltage: VGS(th): VDS = VGS, ID = 250 μA ;2.0 - 4.0 V
Someone should explain the reason?
Watch this.
hangdx9siu:
Why the mosfet IRF520N should control the 12DC motor (it mean the circuit is normal), but should not work in DC 5V motor(0.6A).inspect the output voltage was low.
Drain-Source Voltage: VDS 100V
Continuous Drain Current: ID 9.2A
Gate-Source Threshold Voltage: VGS(th): VDS = VGS, ID = 250 μA ;2.0 - 4.0 VSomeone should explain the reason?
The IRF520 is designed to be operated with ~12V (at least 10V) on the gate. So when you put 5V on the gate it doesn't work properly or at all.
You need a logic-level MOSFET.
You might have been confused by the Vgs(thr) voltage (the threshold voltage), being in the 2 to 4V range.
This means its absolutely not logic level in fact. Threshold voltage is where the device turns hard off,
nothing to do with it being hard on.
Logic level MOSFETs have a Rds(on) rating quoted for Vgs=5V (or lower, typically you see Vgs=4.5V)
They also tend to have threshold voltages around 0.5V--1.0V
You can basically ignore threshold voltage and max current ratings for a MOSFET, use the Rds(on) specification
to tell you the power dissipation and the gate drive voltage. The "max current" is when the device max junction
temperature limit is exceeded with infinite heatsink attached, its not a practical thing at all.
For instance if you want 10A handling, and are prepared to use a small heatsink capable of handling 3W, you'd
use I-squared-R to determine that you need an Rds(on) of 30 milliohms or less and pick a device with that
rating.