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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.

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. Sign up or log in Sign up using Google. Instead, look at the datasheets and the rated on-resistance Rdson, which is specified at a certain gate-source voltage for each part. But you really need a gate driving circuit from 3. In other words, it’s the mean behavior, not the extreme, and you can’t rely on it being valid for all devices.

Email Required, but never shown. Home Questions Tags Users Unanswered. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The MOSFET isn’t considered “on” until the device has completely resistive behavior over a specified range of currents. The FQP30N06L is designed to be driven from voltages of at least 5V, which is the minimum voltage that they specify on-resistance.

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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? 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. As far as protection Sign up using Email and Password.

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.

By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Some devices may have quite a bit higher Rdson at 3.

Is this charging current high enough to damage the MCU pin? If the VGS threshold is like 1.

IRFZ14 Datasheet PDF – Samsung Electronics

In other words, drive past that value. All of that said, I see that a lot of people still recommend using an opto-isolator between the micro-controller and the MOSFET, just to be extra safe. What number am I looking for to determine whether 3. Therefore, Raspberry Pi’s 3.

It’s not cheap ircz14. Mark 1, 7 36 Hi JasonS, forgive my ignorance. It’s like just passing above the threshold voltage on a BJT. More seriously, just because 3. More discussion on this blog entry.

IRFZ12 datasheet & applicatoin notes – Datasheet Archive

Will this be sufficient? The big thing is to look in the data sheet and check the VGS threshold value and look at the graph that shows current flow vs VGS. Post as a guest Name. Alastair McCormack 3. I’d put two resistors into the circuit: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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IR non logic level vs. Don’t drive this directly from an MCU.

I understand that the gate of the MOSFET behaves like a capacitor, and therefore draws some current while “charging”, and then none thereafter. I’ve generally done the opposite: Is this “saturation” achieved by simply providing a high enough voltage on the base that the MOSFET is completely “on”?

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The resistor from MCU pin to gate is also used to slow down the switching edge, to reduce ringing, overshoot, and EMI. I don’t see in the specifications where 5V is given as a minimum. 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. The reason they include it at all is that the relative behavior current goes up with increasing gate voltage and increasing drain voltage is universal I have a few questions, however.

Any lower than that, and you have no guarantees whatsoever of device behavior beyond the uA current of the Vgs threshold. Sign up using Facebook. There are some with logic-level inputs, though.