Timeline for N CHANNEL MOSFET STAYS OPEN
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Aug 26, 2016 at 21:44 | comment | added | Big6 | Interesting. Does it happen with both of the two outputs you're using? It's hard for me to see if all the wiring is ok from the pictures. | |
| Aug 26, 2016 at 17:18 | comment | added | Michael Niebauer | @SixtoCabrera when I use the blue led connected to the MOSFET using 5 volts it works correctly with the same wiring setup as the 12 volts setup. That's why I'm confused | |
| Aug 26, 2016 at 6:48 | comment | added | pipe | It's possible that the MOSFET is simply damaged. Not sure how ESD-sensitive these big guys are, but I know I've ruined some smaller packages. | |
| Aug 26, 2016 at 5:07 | comment | added | Big6 | If I were debugging this, I'd try connecting the other led that you have, to the same pin the gate of the mosfet is connected to and see if you get your blink program to work there. Or just switch the gate to the pin where you have your blue led connected. | |
| Aug 26, 2016 at 4:54 | comment | added | jonk | @pipe: I haven't inspected the breadboard well enough to see that. So I'll take it from you that it is wired okay. Hmm. Does anyone make an oddball pinout for the TO220 and that device? (The PN2222A from OnSemi has a different pinout as does the P2N2222A also from OnSemi, just as one such example.) | |
| Aug 26, 2016 at 4:49 | comment | added | pipe | @jonk From the datasheet, his breadboard setup looks right. | |
| Aug 26, 2016 at 4:48 | comment | added | jonk | Reversing D and S may mean the body diode is conducting. | |
| Aug 26, 2016 at 4:46 | comment | added | jonk | Do you know which is the drain and which is the source? Drain is the center leg... Just want to be sure. | |
| Aug 26, 2016 at 4:41 | comment | added | Michael Niebauer | @SixtoCabrera I added the resistor but it didn't make a difference. The 12 volt led stays on | |
| Aug 26, 2016 at 4:37 | answer | added | pipe | timeline score: 2 | |
| Aug 26, 2016 at 4:34 | comment | added | Big6 | Try connecting a resistor from the gate to ground (say ~10k). After you first switch on, the gate may stay charged up. So if you are not sending a signal to turn the mosfet off, you need a resistor to discharge the gate to ground. | |
| Aug 26, 2016 at 4:26 | review | First posts | |||
| Aug 26, 2016 at 5:10 | |||||
| Aug 26, 2016 at 4:24 | history | asked | Michael Niebauer | CC BY-SA 3.0 |