Timeline for Can you drive a MOSFET directly from a microcontroller?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Oct 13, 2020 at 11:07 | history | edited | SamGibson♦ | CC BY-SA 4.0 |
Added link to datasheet, to help readers better understand the device. Made tags more relevant.
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| Oct 13, 2020 at 10:18 | comment | added | Bimpelrekkie | But for FDN327N gate charge is only 4.5nC Geez, 4.5 nC, that's a lot! I work with MOSFETs that only need 1/10th of that. Size is always relative so never say that a charge "is only" 4.5nC, you cannot draw conclusions like that. | |
| Oct 13, 2020 at 10:15 | comment | added | Bimpelrekkie | The safe option is to add a 100 ohm resistor. Why are you thinking/doubting so much about a 100 ohm resistor that costs 2 cents? Just do what most others do and that is to add a gate resistor. The exact reasons why/why not a gate resistor is a good thing aren't relevant when you're a beginner (and worry about everything) so just do what the experienced people do. | |
| Oct 13, 2020 at 10:06 | answer | added | ocrdu | timeline score: 4 | |
| Oct 13, 2020 at 9:59 | comment | added | Moon | Just switching on and off say every second to give a pulse signal (duration around 2ms) to the load. The load is capacitive and 5V from the micro | |
| Oct 13, 2020 at 9:50 | comment | added | Justme | It depends what the load is and how fast you will be switching it. What is the load, how much current it needs, is it capacitive, inductive or resistive? What is the MCU GPIO output high voltage at the gate, is it 3.3V ? Do you plan to simply turn it on and off every now and then, or use PWM at tens of kHz to drive it? | |
| Oct 13, 2020 at 9:36 | comment | added | Andy aka | It really shouldn't be a big deal to use a 100 ohm series gate resistor. | |
| Oct 13, 2020 at 9:30 | history | asked | Moon | CC BY-SA 4.0 |