Timeline for MOSFET for 5V high-side switch
Current License: CC BY-SA 3.0
11 events
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| Apr 19, 2018 at 20:09 | history | edited | user31708 | CC BY-SA 3.0 |
Seems to work now, but I don't know why.
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| Apr 19, 2018 at 12:18 | comment | added | user31708 |
But why would the intermediary circuit affect the voltage at MES1?
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| Apr 19, 2018 at 12:16 | history | edited | user31708 | CC BY-SA 3.0 |
emphasize "also decreases"
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| Apr 18, 2018 at 6:01 | comment | added | a concerned citizen |
While it doesn't blame the supply, it does blame the intermediary circuit. If you replace the FET with a brute relay, what heppens? If you insert the circuit without the FETs, what happens? If you don't insert the circuit, but only the FETs, and directly (with a wire) control the BS170, what happens?
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| Apr 18, 2018 at 5:22 | history | edited | user31708 | CC BY-SA 3.0 |
added measurement methodology
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| Apr 17, 2018 at 23:45 | comment | added | user105652 | They would not directly solve your problem. They are precautions used to protect the MOSFET's gates from over voltage or current shoot-through, especially when you are in an experimental phase. | |
| Apr 17, 2018 at 23:42 | answer | added | Henry Crun | timeline score: 1 | |
| Apr 17, 2018 at 23:40 | comment | added | user31708 | Thanks, I'll order a zener with those specs. Can you expand on why it would help the problem? | |
| Apr 17, 2018 at 23:14 | comment | added | user105652 | Since you are experimenting, it would be a good idea to put a 12 volt 500mW zener diode from gate to source on the P-channel MOSFET. Put a 1K resistor in series with the gate to limit any instability at the gate. | |
| Apr 17, 2018 at 23:12 | answer | added | Spehro Pefhany | timeline score: 1 | |
| Apr 17, 2018 at 23:05 | history | asked | user31708 | CC BY-SA 3.0 |