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I’ve generally done the opposite: The data sheets can be misleading, they often give the gate voltage for mA current on the front page, and you find that they need 12V for 5A, say.
But you really need a gate driving circuit from 3. The Datasheett isn’t considered “on” until the device has completely resistive behavior over a specified range of xatasheet.
Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. I’d put two resistors into the circuit: The downside is that a MOSFET doesn’t pull a constant amount of current across the entire edge, since it looks like a resistor; this slows down switching a capacitive load.
IR non logic level vs. Alastair McCormack 3.
Therefore, Raspberry Pi’s 3. Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”? Will this be sufficient?
The FQP30N06L is designed to be driven from voltages of at least dataheet, which is the minimum voltage that they specify on-resistance. Sign up using Facebook. MCU pins are usually inputs on reset, and this could cause the gate to float momentarily, perhaps turning the device on, until the program starts running.
Email Required, but never shown. As far as protection You only pay power to switch a MOSFET, not to keep it on, which reduces power dissipation in both the transistor and the part that drives it, especially if switching is infrequent.
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By placing a resistor in series with the gate, I can protect the pin, but this will slow down the switch, possibly resulting in high heat dissipation by the MOSFET? I don’t see in the specifications where 5V is given as a minimum. Hi JasonS, forgive my ignorance. More seriously, just because 3. Note that “logic level” does not seem to be an exactly standardized term, and it won’t necessarily show up as a parameter in the parametric search at the vendor sites, nor will it necessarily show up in the data sheet.
Is this charging current high enough to damage the MCU pin?
Sign up using Email and Password. It’s like just passing above the threshold voltage on a BJT.
(PDF) IRFZ14 Datasheet download
Post as a guest Name. The resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI.
What number am I looking for to determine whether 3. Some devices may have quite a bit higher Rdson at 3. I understand that the gate of the MOSFET rifz14 like a capacitor, and therefore draws some current while “charging”, and then none thereafter. It’s not cheap 0. The reason they include it at all is that the relative behavior current goes up with increasing gate voltage and increasing drain voltage is datzsheet Mark 1, 7 36 More discussion on this blog entry.
Don’t drive this directly from an MCU.