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Questions tagged [mosfet]

An transconductance (using voltage to control current) electronic component used for switching and amplification. Acronym for Metal-Oxide-Semiconductor Field-Effect Transistor. (from http://en.wikipedia.org/wiki/Transistor)

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3answers
857 views

P-Channel MOSFET Inrush Current Limiting - Transistor burn issue

I'm fighting with PFET inrush current limiting circuit discussed here: P-Channel MOSFET Inrush Current Limiting In my circuit is input voltage 24V DC and C_Load is 6mF. I'm switching on transistor ...
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2answers
82 views

Relationship between Vgs ang Vds

Above is the output characteristics graph of IRFZ44N mosfet. As we can see, the output for various Vgs values are plotted. The highest two Vgs values (10v, 15v), have their Vds points halted below 10v ...
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1answer
57 views

Why is this solenoid valve consuming so much power?

The circuit below drivers a pump and a valve, the pump works fine, the valve consumes much more current than I'd expect. The valve is rated 2W at 12V (600mA) i'm more like 15W. The PUMP_DRIVE signal ...
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2answers
94 views

LTspice transformer voltage course problems at low duty cycle

I am trying to simulate full bridge SMPS in LTspice where I can change the input voltage to the voltage regulator (LT317) by changing the pulse width of the PWM signal at the MOSFETs. Everything ...
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2answers
37 views

Switched capacitor resistor

I have some basic doubts about switched capacitor resistors: With this circuit we get an equivalent resistance equal to (Reference: Wikipedia): Where f is the frequency of the clock signals that ...
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2answers
80 views

Calculating Drain voltage of a mosfet

With no external resistors, is it possible to calculate drain voltage of a MOSFET with known values for Vg, Vs, Vb, and Ids?
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1answer
98 views

Slayer exciter(Mini Tesla Coil) Not Working[IRFZ44N]

I made a tesla coil as https://www.youtube.com/watch?v=Ca2e3evwVK0 's circuit. the MOSFET seems to be getting hot and current passes through the primary but I get no response from the secondary. ...
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46 views

Wireless power transfer circuit to attain ~5W of power on the receiving end

I am designing a WPT system to run a ws1812 based pixel chain. The ws2812 pixel chain runs on 5v and consumes 500-800ma of power, means 2.5w-4w. The system I made is not able to transfer adequate ...
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1answer
59 views

How do I get this PFET to switch off when G=5V (high)

What am I missing (and why) to allow this PFET to switch on and off? I'm new to this but am learning. The circuit is part of a larger schematic I am working on. Once I get this working I can insert it ...
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39 views

How to prevent reverse current/voltage on a sense line?

I'm designing a rocket launch controller, that incorporates an Arduino to provide a safer and more controlled launch. Original rocket launch controllers used to use an incandescent light bulb and a ...
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2answers
1k views

How to get an analog signal 0 to 12 V DC based on reference 0 to 5 V DC?

I have an Arduino which is creating an analog voltage from 0 to 5 V (I used external DAC for it) and I need to use it for the regulation of "big" circuit with 12 V DC. So I am trying to get ...
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2answers
66 views

Optocouplers driving MOSFETs in an inverter

For many hours I was trying to simulate in LTspice XVII an optocoupler driver for MOSFETs in an inverter. My project is to build a SMPS with linear voltage stabilizer (I didnt put it on the schematic ...
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1answer
49 views

Power a coil with a MOSFET driven by a BJT in ground

I am trying to do something something maybe trivial. I have little to no knowledge in transistors so bear with me. I want to power a high voltage coil with a low current switch using transistors I ...
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51 views

Why are diodes a fundamental part of a MOSFET [duplicate]

I noticed that there are diodes inside a N-Channel Mosfet. I am curious as to a simple explanation of what the diode does exactly?
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0answers
49 views

Parameter extraction of MOSFET

I am doing the internship at Texas Instruments. I need to extract the parameters of MOSFET to study how all these parameters are getting affected by stress on silicon chips. If you guyz have good ...
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1answer
102 views

mosfet gate charge

Because I was worried about the gate inrush current of a p-mosfet, because of a lacking gate-resistor, I decided to measure the switching times with an oscilloscope. I also considered another ...
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1answer
44 views

Measuring Voltage drop across MOSFET 2N7000

My setup is 2.1V on the gate. A 330 Ohm load between Vdd and drain. And Source to ground. I stepped Vdd from 0V to 9V in small increments and measured the current through Vdd to ground. Got currents ...
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1answer
71 views

Current Mirrors Design in IC

I was looking at a certain circuit in which there was the necessity of generating 3 DC current sources (10uA, 50uA, 250uA), starting from a given current source of 10uA. Let's consider firstly the ...
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48 views

Is the switching speed of MOSFET comparable to that of a Schottky diode?

Assuming identical voltage and current rating, which is having higher switching speed? MOSFET or Schottky diode? In synchronous buck converter, we replace Schottky diode with MOSFET (low side) for ...
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0answers
28 views

Is it possible to implement a high-side current mirror with only NMOS FETs?

I need to implement a difference amplifier only using NMOS technology. I am struggling when trying to reference the voltage difference to ground. From my reading it looks like I need a high-side ...
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1answer
67 views

MOSFET to disconnect 3S 12.6V battery

I have a device absorbing up to 12 amps that is powered by a 3S 12.6V lipo battery. Every time I have to start this device, I need to plug-in the battery and this is quite annoying. I would like to ...
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1answer
47 views

PWM Mosfet (and help identifying the right one)

I am building a project to control a 12 V, 10 A heating system from a Raspberry Pi. I have identified that I need to use a MOSFET transistor and I will control the output by using pulse width ...
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1answer
66 views

What is the reasoning behind Barkhausen's criteria?

Especially why should loop gain be equal to 1, won't that give us infinite circuit gain?
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1answer
47 views

Arduino RGBW 24v LED strip driver

This might not even be the right place for me to ask, but I hope somebody can help; I have an arduino mega with 4 PWM outputs (5v, fitted with 220 ohm resistor) that I would like to use to control ...
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1answer
91 views

What are these resistors for?

I am looking at implementing a MOSFET Bridge Rectifier circuit. I am trying understand why there is a difference in the basic application circuit and layout from the app note. The layout image below ...
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1answer
63 views

exceed drain-source voltage on mosfet

what happens if I exceed the maximum rating of the drain-to-source voltage of an N-MOSFET I am using NTNS3C94NZ so 12 V in this case datasheet: https://www.onsemi.com/pub/Collateral/NTNS3C94NZ-D....
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32 views

Error in LTSPICE MOSFET model

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2answers
68 views

Switching power source using P-channel MOSFET

In a below schematic, PVBUS and VBUSIN are both attached to USB VBUS of two different USB ports (so +5V). The goal is to be able to power +3V3 regardless of whether VBUSIN is present or not. If VBUSIN ...
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41 views

How to choose the correct N channel Enhancement MOSFETs?

Having little to no experience on MOSFETS i am having trouble part sourcing the correct one, one that will work for my applications. But before i go with the terms let me show the circuit first ...
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62 views

Driving a motor freezes Arduino

I am trying to drive a Carrera Digital car (brushless DC motor) using an Arduino and an L293D h-bridge motor driver. My schematic is the following: I have also connected an IMU (GY-521 MPU-6050) to ...
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2answers
126 views

Connecting battery packs in parallel and series, each with their own BMS

Recently I bought cheap a lot of CASIO DT-9723LI battery packs. Every pack consists of 2 Sony 6th-gen Li-ion 18650 cells and its own 2s BMS. Here the question arises: Can I connect this packs ...
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1answer
48 views

Is Vout in this circuit loop-grounded when Vin becomes 0V?

I don't have expertise in this area. So any answer or instruction would be helpful to relieve my pain. I think Vout would lose its GND when Vin becomes '0V' because C is located before GND. Am I ...
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2answers
36 views

Switch AtTiny1614 on and off

I have built the following circuit to reset an AtTiny1614 (the mega tiny 1 series). They don't have a reset switch and I thought with this circuit I could (hard-)reset the chip by doing a power cycle. ...
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24 views

ZXM61N03FTA as a replacement for Si1308EDL

I'm working on a e-Paper display driver. The reference design uses Si1308EDL as part of the boost converter. I'm sourcing the components from LCSC, but unfortunately Si1308EDL is not in their stock. I ...
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92 views

How to suppress noise in my circuit

I illustrated what my circuit do as you see. Switching frequency is 800 Hz. When I increase the load, a noise is heard from my circuit. Here is my drain oscillocope view in frequency domain. What can ...
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57 views

Dual MOSFET Switch Circuit not switching

I'm trying to switch a high-current, 12V load (large parallel LED strip, with the anode connected to LOAD-) using a PWM chip. My approach right now is to use a ...
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0answers
46 views

IGBT chip metalization

Consider an IGBT chip within a power module. The top surface of the chip is often metalized by aluminum (with approximately 5 microns thickness) to bond some aluminum wires into the chip; I am hazy ...
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2answers
98 views

Circuit for choosing one power supply from several of them

I have a load and four different voltage sources. I want to change the voltage on the load by using four different enable signal as seen in the schematic below. Note that, all of the "Enable" signals ...
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1answer
28 views

Designing an over discharge lithium ion protection circuit

I am trying to build a portable RGB LED display that runs off a Lithium Ion battery. After a few days of research, I understand the importance of using a dedicated IC to handle charging the battery, ...
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0answers
31 views

Are there MOS VLSI Process Design Kits (SPICE models) for free SPICE simulators?

I want to do some proof-of-concept work in IC analogue IC design. I know that plenty of free circuit simulators exist (LTSpce, NgSpice etc.), however they are meant for PCB simulation and most perform ...
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2answers
38 views

Logical level conversion with MOSFET-N

I doubt if the way I am converting the logical level is correct and if it is the best way to do this. The PWM_1 signal comes from a STM32F4 microcontroller. When PWM_1 = logic level 1 I have 3.3V. ...
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46 views

Turn-on and turn-off switching energy

Is it possible to calculate the turn-on and turn-off energy of SiC-MOSFETs with datasheet parameters? The method with ½ * U * I * tr (or tf) cannot be used here. Let us take the C2M0080120D from Cree ...
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1answer
58 views

Noisy MOSFET RGB LED driver problem

I'm controlling a 12v RGB LED strip from an Arduino Mega following the tutorial here I'm controlling with 3 pots via the Mega's ADC >> PWM value written out using ...
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33 views

Making a more efficient replacement for my diode

I am making a boost converter using the LM3481 IC (although it might be considered a sepic topology as well). Typically in a boost topology, you put a diode before the output capacitors so they don't ...
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0answers
55 views

Pulse Transformer design problem: cant understand for sure whats the reason or irregular output waveform?

A ferrite core pulse transformer provided with 12V PWM signal (as primary winding input voltage) as shown in Fig-1, produces irregular output voltage across the secondary winding as shown in Fig-2. I ...
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2answers
256 views

Please review this electric guitar buffer / volume / tone circuit

I have been tinkering with creating a MOSFET buffer circuit for my guitar to boost the high impedance output from the pickups to help drive the signal through long cables and pedal boards. This also ...
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56 views

Would this shift register schematic avoid master/slave if I extended it to four billion bits? [duplicate]

simulate this circuit – Schematic created using CircuitLab The basic data structure for the machine I want to build is a shift register. Quite some time back someone told me that if I could ...
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1answer
722 views

Are MOSFET drains ESD sensitive?

There's a lot of post on here about MOSFETs and ESD sensitivity. But whenever the general question is asked, people always go straight to the gate and how sensitive it is. I've developed an LED ...
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24 views

Parasitic Inductance - DPT circuit

I have a question about parasitic inductances. Let's take the figure below as an example, a DPT circuit is shown here. I have added an inductor (parasitic loop inductance). I would like to have a ...
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1answer
35 views

How do I solve the input resistance of this BJT and MOSFET in series?

This is a sedra-smith microelectronics excercise question for which I can not find the answer and I hoped for perhaps a solution here?