Timeline for MOSFET Gate Resistor Problem
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 7, 2020 at 8:35 | comment | added | a concerned citizen | For 2) I already gave the answer. For 1) it means you have some inductive load, because the ringing would not happen with a resistive one (unless your traces are really bad). So you can have anything from a relay to a transformer. Which means it's the inductance, or parasitic inductance(s) that combine with the inherent parasitic capacitances of the MOS that cause the oscillations. Which, in turn, means that the mitigation of the problem is not done on the driver side. This is what I meant when I said to describe what are you doing with the transistor. The devil is in the details. | |
| Dec 7, 2020 at 1:39 | comment | added | RGB Engineer | Hello, I am using the UCC28700 to drive the MOSFET (by drive, I mean pull the gate pin high). I am trying to figure out what resistor value use to 1. Dampen the ringing observed when the drive pin pulls the signal low 2. Limit the in-rush current that the drive pin would experience because of the input capacitance on the gate of the MOSFET | |
| Dec 6, 2020 at 23:16 | history | answered | a concerned citizen | CC BY-SA 4.0 |