Author Topic: IRFZ44N Mosftet with Arduino  (Read 5956 times)

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Offline radhika

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IRFZ44N Mosftet with Arduino
« on: September 10, 2018, 10:38:20 am »
Hello,
I am building a boost circuit and I am using IRFZ44N MOSFET. But, as I am using Arduino, so I just have 3.3V or 5V as VGS. But according to the link http://www.irf.com/product-info/datasheets/data/irfz44n.pdf. we need VGS = 10V to switch on the mosfet.
Can anybody explain me how do I do this?
 

Offline rajivdeo

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Re: IRFZ44N Mosftet with Arduino
« Reply #1 on: September 10, 2018, 11:47:38 am »
Hi

For use with Arduino please use IRLZ44N instead of IRFZ44N.
 
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Offline wraper

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Re: IRFZ44N Mosftet with Arduino
« Reply #2 on: September 10, 2018, 11:57:21 am »
Yes, use logic level MOSFET if don't want to use gate drive circuit with additional power rail with higher voltage.
 
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Offline radhika

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Re: IRFZ44N Mosftet with Arduino
« Reply #3 on: September 10, 2018, 01:23:06 pm »
Hello,
I only have IRFZ44N but not IRL
What to do now?
 

Offline radhika

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Re: IRFZ44N Mosftet with Arduino
« Reply #4 on: September 10, 2018, 01:25:02 pm »
Hello,
IRFZ44N is not a logic level circuit.
Can things be done by using driver circuit? If yes, then which driver IC i will use?
 

Offline Zucca

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Re: IRFZ44N Mosftet with Arduino
« Reply #5 on: September 10, 2018, 01:40:04 pm »
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 

Offline wraper

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Re: IRFZ44N Mosftet with Arduino
« Reply #6 on: September 10, 2018, 02:05:03 pm »
http://lmgtfy.com/?q=irfz44n+arduino

it should be easy
And 99% of suggestions are incorrect,  showing to directly connect the gate  :palm:.
 

Offline Zucca

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« Last Edit: September 10, 2018, 02:23:08 pm by zucca »
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 

Offline JS

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Re: IRFZ44N Mosftet with Arduino
« Reply #8 on: September 10, 2018, 02:17:46 pm »
Charge pump with one uC pin and then a transistor switching the gate using that new voltage

JS

If I don't know how it works, I prefer not to turn it on.
 

Offline wraper

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Re: IRFZ44N Mosftet with Arduino
« Reply #9 on: September 10, 2018, 02:20:22 pm »
Correct answer how to drive the gate depends on what voltages do you have in your circuit and how fast switching needs to be.
 

Offline JPortici

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Re: IRFZ44N Mosftet with Arduino
« Reply #10 on: September 10, 2018, 02:21:06 pm »
are we looking at the same datasheet?
Altough the rated RDSon is for VGS = 10V, Gate threshold is listed at 4V max and Figure 1 suggests that at 5V it could be turned on enough for your needs.
Granted, i wouldn't like to work so close to the limit, but since it's all through hole parts you can put together a test circuit on a breaboard or perfboard see if it's acceptable. it could work
 

Offline wraper

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Re: IRFZ44N Mosftet with Arduino
« Reply #11 on: September 10, 2018, 03:51:33 pm »
are we looking at the same datasheet?
Altough the rated RDSon is for VGS = 10V, Gate threshold is listed at 4V max and Figure 1 suggests that at 5V it could be turned on enough for your needs.
Gate threshold voltage is when MOSFET only starts barely conducting. If you get one with 4V Vgs, hell it won't work well from 5V
 

Online langwadt

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Re: IRFZ44N Mosftet with Arduino
« Reply #12 on: September 10, 2018, 03:55:57 pm »
are we looking at the same datasheet?
Altough the rated RDSon is for VGS = 10V, Gate threshold is listed at 4V max and Figure 1 suggests that at 5V it could be turned on enough for your needs.
Gate threshold voltage is when MOSFET only starts barely conducting. If you get one with 4V Vgs, hell it won't work well from 5V

depends on what you need, look at the graph for typical output characteristics, it's ~6A at 4.5V Vds
 
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Offline wraper

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Re: IRFZ44N Mosftet with Arduino
« Reply #13 on: September 10, 2018, 03:59:37 pm »
are we looking at the same datasheet?
Altough the rated RDSon is for VGS = 10V, Gate threshold is listed at 4V max and Figure 1 suggests that at 5V it could be turned on enough for your needs.
Gate threshold voltage is when MOSFET only starts barely conducting. If you get one with 4V Vgs, hell it won't work well from 5V

depends on what you need, look at the graph for typical output characteristics, it's ~6A at 4.5V Vds

It's "typical" = silicon die lottery. And it will get worse at low temperatures.
BTW this is barely usable even with typical figure due to high losses.
« Last Edit: September 10, 2018, 04:07:43 pm by wraper »
 

Offline Zero999

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Re: IRFZ44N Mosftet with Arduino
« Reply #14 on: September 10, 2018, 07:16:19 pm »
Hello,
I am building a boost circuit and I am using IRFZ44N MOSFET. But, as I am using Arduino, so I just have 3.3V or 5V as VGS. But according to the link http://www.irf.com/product-info/datasheets/data/irfz44n.pdf. we need VGS = 10V to switch on the mosfet.
Can anybody explain me how do I do this?
What voltage and current load is the MOSFET switching and at what frequency?

If the current is not much more than 1A and voltage above 12V or so and it only needs to be switched a a few hundred Hz or less, you'll probably get away with driving the IRFZ44N from 5V.

Failing that, you need to use a higher voltage gate drive circuit. If you can't get the IRLZ44N, then I presume specialist MOSFET driver ICs are also out of the question? If so a MOSFET driver can be built from ordinary BJTs. It depends on the requirements. Answer my previous questions and I might be able to suggest something.
 
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Offline JPortici

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Re: IRFZ44N Mosftet with Arduino
« Reply #15 on: September 10, 2018, 10:12:39 pm »
If the current is not much more than 1A and voltage above 12V or so and it only needs to be switched a a few hundred Hz or less, you'll probably get away with driving the IRFZ44N from 5V.

Thank you, that was what i meant. I don't think one can expect something more from an "arduino based" boost converter
 

Offline radhika

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Re: IRFZ44N Mosftet with Arduino
« Reply #16 on: September 11, 2018, 04:59:33 pm »
The Voltage is 5V as a inpput from the Arduino. And I used it in Boost circuit so, I want to get 19.5V. Also, current is 2.5A and frequency is 8.5kHz.

I want to know that what driver IC should I use for it, as IRFZ44N is not a logic level Mosfet. So, can you suggest me a driver with a circuit which drive MOSFET for PWM?
 

Offline Zero999

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Re: IRFZ44N Mosftet with Arduino
« Reply #17 on: September 11, 2018, 07:16:12 pm »
Wow 8.5kHz is quite a low frequency for a switched mode power supply. It will need a very large inductor.

JS has already hinted on the answer: use another pin to drive a charge pump to boost the 5V up to 10V - a couple of diode drops and power the MOSFET driver from that. Sequencing will be important. The charge pump must be run for long enough to bring the MOSFET driver up to a suitable voltage, before the MOSFET is turned on.

Here's an example of a voltage doubler using a 555 timer. Of course the 555 can be swapped with a squarewave output from your MCU. The diodes can be swapped with Shotkky units for a lower voltage drop.

http://www.555-timer-circuits.com/voltage-doubler.html

Another possibility is to power the MOSFET driver from the output of the boost converter. The main downside with that option is the MOSFET will be running hot, with high conduction losses, up until the secondary voltage is high enough to drive the MOSFET properly. There's a risk it might not be able to start on a full load.

Here are a couple of links to some MOSFET driver ICs. If you can't get hold of either of them, I'll suggest a discrete circuit with BJTs, if someone doesn't beat me to it.
https://www.onsemi.com/pub/Collateral/MC34152-D.PDF
http://ww1.microchip.com/downloads/en/DeviceDoc/22022b.pdf
 
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Offline malagas_on_fire

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Re: IRFZ44N Mosftet with Arduino
« Reply #18 on: September 11, 2018, 09:15:06 pm »
Hi

Can we also use a IRF540 to connect a arduino using a auxiliary BJT  + resistor dividor to toggle it? The dataheet from vishay says that the Vgs threshold is minimal 2V and maximum 4V so 3V in Gate would be save? Or this means the threshold towards the voltage on Drain?

(Edit)

Link to the datasheet:

https://www.vishay.com/docs/91021/91021.pdf
« Last Edit: September 11, 2018, 09:20:46 pm by malagas_on_fire »
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Online oPossum

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Re: IRFZ44N Mosftet with Arduino
« Reply #19 on: September 11, 2018, 09:22:47 pm »
Vgsth is when the MOSFET just begins to turn on. Look at the Vgs vs Ids chart to determine the minimum gate voltage and make sure you exceed that. Figure 3 in the data sheet you linked.
« Last Edit: September 11, 2018, 09:24:33 pm by oPossum »
 

Offline Zero999

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Re: IRFZ44N Mosftet with Arduino
« Reply #20 on: September 12, 2018, 07:48:20 am »
Hi

Can we also use a IRF540 to connect a arduino using a auxiliary BJT  + resistor dividor to toggle it? The dataheet from vishay says that the Vgs threshold is minimal 2V and maximum 4V so 3V in Gate would be save? Or this means the threshold towards the voltage on Drain?

(Edit)

Link to the datasheet:

https://www.vishay.com/docs/91021/91021.pdf
The IRFZ44N also gives the same threshold as the IRF540.

Looking at the graphs on the data sheet, the IRF540 will be similar to the IRFZ44N.

 

Offline malagas_on_fire

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Re: IRFZ44N Mosftet with Arduino
« Reply #21 on: September 12, 2018, 08:50:18 am »
The scale on the graphic is logaritmic so were to use 5V 1A on drain source, i can put 3V on the gate according to the graphs. it is for a low power application of maximum 1A peak, nominal maximum 200mA.

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Offline Zero999

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Re: IRFZ44N Mosftet with Arduino
« Reply #22 on: September 12, 2018, 09:24:57 am »
The scale on the graphic is logaritmic so were to use 5V 1A on drain source, i can put 3V on the gate according to the graphs. it is for a low power application of maximum 1A peak, nominal maximum 200mA.
Which graph are you talking about for which part?

5V of voltage drop between the drain and source would be unacceptable in most applications.
 

Offline malagas_on_fire

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Re: IRFZ44N Mosftet with Arduino
« Reply #23 on: September 12, 2018, 11:24:54 am »
The graph on the IRF540 datasheet, Figure 3  which was advised from oPossum to pick the Vgs for the desired current .

See comments above for more details.
 
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Offline Zero999

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Re: IRFZ44N Mosftet with Arduino
« Reply #24 on: September 12, 2018, 12:37:08 pm »
The graph on the IRF540 datasheet, Figure 3  which was advised from oPossum to pick the Vgs for the desired current .

See comments above for more details.
At a junction temperature of 25°C, it shows ID = 13A when VGS = 5V and VDS = 50V, an enormous voltage drop. The static power dissipation would be 650W, which is why it's tested with a 20μs pulse.
 


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