Linked Questions

17
votes
3answers
52k views

Question about mosfet gate resistor

I have n mosfet gate connected to 4043 logic and Id is about 100mA. Both 4043 and mosfet has +5v. I have plan to use 2N7000 mosfet Questions are: How large gate resistor i need between 4043 and ...
13
votes
3answers
7k views

Driving DC motors with MOSFETs and a microcontroller?

I'm developing a nano quadcopter using an Atmega328 microcontroller, powered at 3.3V, and very small brushed DC motors. The average current used by these motors is about 800mA @ 3.7V. Initially, to ...
8
votes
4answers
24k views

How to reduce MOSFET turn-off delay

The title says it all in signal switching applications - besides choosing a different device, how can I reduce the turn-off delay of (N-channel) MOSFETs? Is there something similar to the Baker Clamp ...
4
votes
2answers
5k views

PMOS Inrush Current Limit - Where to place Capacitor

In order to reduce back-EMI of a Buck converter a LC input filter is to placed in front of the converter. To limit the inrush current when those caps are charged I consider to use a PMOS with a RC ...
1
vote
1answer
915 views

Is Rg, calculated in the linked PDF calculating the pulldowm/pullup resistor for a MOSFET gate?

I stumbled upon the following paper while looking for ways to calculate a specific value for the pullup/pulldown resistor for the gate of a MOSFET. I see several calculations for Rg. Is that the ...
0
votes
1answer
985 views

problem with driving the mosfet through optocoupler

I want to run the mosfet (irf540n) through opto coupler(4n25) for driving the motor. I refered some formula from this website, but my circuit is not working. I calculated opto coupler current limting ...
0
votes
1answer
712 views

A question about a Class E Tesla Coil circuit

The link to the original website and the schematics : http://uzzors2k.4hv.org/index.php?page=4MHzclassE1 http://uzzors2k.4hv.org/projectfiles/4MHzclassE1/proper_4MHz_classE_SSTC.gif I'm trying to ...
0
votes
2answers
279 views

Problems with IRF520 Transistor

This is the schematic for the project. I'm using an IRF520 transistor (http://www.futurlec.com/Transistors/IRF520.shtml) which goes from left to right Gate->Drain->Source. So the problem is that when ...
3
votes
1answer
245 views

MOSFET driver input resistor

In datasheet for MOSFET driver ZXGD3003E6TA is following typical application circuit: What should be the value of circled resistor? I did not find any reference in documentation. Datasheet link: ...
0
votes
1answer
278 views

freechargecontroller.org LO side

I wired one up. It's the low side assembly for: I'm using a small cheap coil for my breadboard. I have been told already about the resistor 470K Ohm between the gate and source. I made sure that its ...