Electronics > Beginners
Bogus parts from Reputable Dealer?
nigelwright7557:
10K is a high value for gate resistor.
I tend to use 390R.
Jwillis:
--- Quote from: nigelwright7557 on February 19, 2020, 12:24:34 am ---10K is a high value for gate resistor.
I tend to use 390R.
--- End quote ---
The current draw at the gate of a mosfet is negligible . In the nanoamps. The Voltage drop across 10K resistor would have little effect to the voltage at the gate.
rstofer:
But it could have an effect on rise/fall times and, thus, heating. If it matters...
For power applications like H-bridges, we want to drive Amps into the gate to overcome the capacitance.
Jwillis:
--- Quote from: rstofer on February 19, 2020, 01:54:55 am ---But it could have an effect on rise/fall times and, thus, heating. If it matters...
For power applications like H-bridges, we want to drive Amps into the gate to overcome the capacitance.
--- End quote ---
Yes if your running a pulse.But not when running in linear. The way its used here in in linear mode.
exe:
In a linear application the gate resistor becomes a part of feedback loop and need to be chosen wisely, imho. Although, I can't say if too big value can be a problem or not. Probably not as it seems to be pushing "first pole" to lower frequencies (as together with gate capacitance it makes a low-pass filter), making the whole loop more stable, but I advice use a simulation to confirm this.
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