Switching MOSFET

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Switching MOSFET on: September 29, 2020, 01:58:41 PM
Hey there, I am currently working on 0-100 (1A) buck converter using stm32. I want to switch MOSFET ( IRFZ44N ) at 500 KHz. I can not get the square wave at the output. After (Vg = 5v, R_Load = 10 Kohm, Vs = 12v) 32KHz, it looks like capacitor charging curve. Anyone suggest me about how to switch MOSFET properly. Which MOSFET should I use?



Re: Switching MOSFET Reply #1 on: September 29, 2020, 05:47:23 PM
I don't fully understand the problem. You can't get a 500KHz from the stm32 or the output of the entire circuit is bad? A buck converter should have DC outoput by filtering the PWM with the capacitor. Share the circuit so we could take a look. If the circuit output value is the problem, try different capacitor values. Also 500KHz is a bit to high, right?



Re: Switching MOSFET Reply #2 on: September 30, 2020, 09:28:53 AM
Here, I am posting the schematic and waveforms. Kindly look at the waveforms at different frequencies. The waveform is taken between the 10k Ohm load. The duty cycle is 50% for all frequencies.

With the STM32 we can get frequency up to 24 Mhz. I want to drive my buck converter at around 100 kHz. Suggest me the ideal frequency from your experience. In the next post, I will post the waveform using the transistor as a mosfet driver, which you used in your buck converter project.

I want to make Converter for 0 to 100v, but I am testing the MOSFET at 12v.

Thank You. :)
 

« Last Edit: September 30, 2020, 09:35:31 AM by Noob 1381 »



Re: Switching MOSFET Reply #3 on: September 30, 2020, 09:43:46 AM
I think that is something normal. It is called MOSFET skew. It is the time it takes to rise and fall and can be affected by parasitic capacitance and by the rest of the components around the MOSFET. When I've made my 50V boost converter, I've used 32Khz for the PWM so maybe try that value. Also, when you add the coil and capacitor at the output, those will affect the signal too. I think testing with different values is the best in this case.



Re: Switching MOSFET Reply #4 on: September 30, 2020, 09:46:09 AM
Now the same thing with the transistor as a driver.

Your help would be a lot for me. _/\_

Thank You. :)



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Re: Switching MOSFET Reply #7 on: January 03, 2024, 05:36:57 AM
The waveform that you used in your buck converter project will be posted in the following post, which will employ the transistor as a mosfet driver
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Re: Switching MOSFET Reply #8 on: February 04, 2024, 08:02:10 AM
The waveform you utilized for your buck converter project—which employs the transistor as a mosfet driver—is included in the next poly track .



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