Hi,
I thought it was a roll of fabric for a commercial process.
E

 

Hi,
I thought it was a roll of fabric for a commercial process.
E

I apologise. I should have written more details in the description.
It's a personal project that doesn't have to be sold and doesn't have to meet precise standards, so I was looking for fairly simple solutions such as an op-amp or a transistor

 

If you want to regulate the fabric heat by varying the power, then you will need a feedback control loop to control that.
This could likely be done with a heat sensor input to an op amp that controls a transistor.

 

I am trying to simulate the characteristic of an IRLZ44N before testing it

In post #6 I mentioned the "threshold voltage" because it shows a range of sensitivity that could happen in a real circuit.
The simulation model is only for a device that has "typical" specs. Then the circuit you build and test might work better or worse than the simulation.

 

The datasheet lists a 2V maximum Vgs threshold voltage where some IRLZ44 Mosfets draw only 0.25mA. Then with 3V for its Vgs there is no way for these ones to conduct 16A to 20A.

Hi agu.

The above quote is what you said in post #6,
not

Then the circuit you build and test might work better or worse than the simulation.

The typical specifications for a device are based on an 80% probability that the device parameters will fall in the typical specification stated in the datasheet.

The model of the IRLZ44N was created by Infineon engineers, and the simulations posted on this thread show that their parameters are as the datasheet.

I am sure it would more beneficial to the TS's to learn the details of their devices if your technical explanations were more helpful.

E

 

If you want to regulate the fabric heat by varying the power, then you will need a feedback control loop to control that.
This could likely be done with a heat sensor input to an op amp that controls a transistor.

As I said here
But I do not know which bjt or which mosfet to choose for this application.

 

The typical specifications for a device are based on an 80% probability that the device parameters will fall in the typical specification stated in the datasheet.

Hi Eric, I thought "typical" specs are for only some of devices made, then 50% are above and the other 50% are below in the listed range of specs.
I also thought some more devices have specs above or below minimum and maximum specs and are destroyed or picked by a seller from a dumpster then sold cheaply on ebay.

 

Hi agu,
It seems to depend on which version the manufacturer uses to determine the typical specification.
I tend to accept the version where it claimed as ~80% of the devices will fall in the typical range.

We both know that when designing an actual circuit for a particular application, we select the supporting components and drive voltages for the semiconductor device that will ensure operation of the complete circuit over the required environmental range.
Sometimes in a production environment, it is necessary to pretest batch components, to ensure that they meet the required specification.

I agree with your point.
I also thought some more devices have specs above or below minimum and maximum specs and are destroyed or picked by a seller from a dumpster then sold cheaply on ebay.
I would do a quick pretest on any semiconductors I considered suspect

When simulating the same circuit, we can only test it's performance based on the simulation model, of course we have the option to vary the component values and the simulation temperature.

We repeatedly remind the novice simulator user, that the simulator will not design the circuit, it is just a guide indicating the probability that their design will meet the required specification.

Eric

Added links.
https://electronicsbeliever.com/important-mosfet-design-parameter-to-consider/

https://www.vishay.com/docs/68214/turnonprocess.pdf