Questions tagged [powermosfet]

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Calculating MOSFET gate current with \$Q_\text{total} = I_\text{gate} \cdot t\$

Hi I am using the MOSFET IRFP4368. I want to use the equation $$ Q_\text{total} = I_\text{gate} \cdot t $$ to calculate the required gate current of my MOSFET driver. I have my total \$Q_\text{total}...
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14 views

What is the use of epitaxial layer in vertical MOS?

In a vertical MOS(figure below), what is the use of the epitaxial layer? I understand that this epitaxial layer is a lightly doped n-type layer. Being lightly doped, it will have a high resistance ...
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1answer
57 views

Need help understanding the mosfet trailing edge Dimming

I am working on a circuit to control AC loads up-to 1.5KW by using Mosfets(FCHD125N65S3R0-F155) Circuit is I have few concerns The current is flowing through the body diode of Q2 for positive half ...
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2answers
102 views

H Bridge runs for few minutes and MOSFETS start smoking

I have created an H bridge as shown in the schematic below. PWM signal to the MOSFET driver is given by a microcontroller running on 5V. The MOSFETS are screwed to heat sinks. To control the motor ...
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2answers
82 views

MOSFET H-Bridge FAN7388

In this question Fan7388MX on StackExchange, someone asked how to choose the resistor values for FAN7388MX MOSFET driver. Datasheet: https://eu.mouser.com/datasheet/2/308/FAN7388-D-1805672.pdf The ...
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3answers
85 views

How to digitally control a MOSFET? [closed]

I'm trying to make a temperature controller for peltier module using MOSFET. The peltier uses 3.3 to 12 volts and 15A. So far I've only come across a way in which the circuit uses a potentiometer at ...
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2answers
44 views

MOSFET gets hot in an Op-amp MOSFET-based constant current load build

I've made this schematic following the circuit steps in this site: and after running the output with just 0.1-1A (which works ok according the input setting and current reading seems correct) but the ...
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1answer
81 views

Why do bare die chips (MOSFET) have a maximum storage temperature?

As far as I understand, a chip in general and a MOSFET in particular has a maximum operating temperature (let‘s say 125 °C or 150 °C for Si) because above that temperature the risk increases of ...
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2answers
40 views

Oscillations in voltage-controlled current source with MOSFETs and opamp feedback — Why?

I have a circuit that should operate as a voltage-controlled push-pull current driver, able to source or sink at least 2A (into a 1 ohm load). It has unexpected oscillations on the output current. ...
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1answer
35 views

P-channel MOSFET switch - very high Rdson

I am trying test my p-channel mosfet (IRF9Z34) high side switch on load. On circuit simulator I get the result I expect, Rdson (VM1) is low and load current is 1.4A. (In the target system the gate ...
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3answers
49 views

what is causing this ring effect on my MOSFET testing circuit and how would I be able to calculate the MOSFET power losses?

So I have the following circuit This is the data sheet for the MOSFET enter link description here Using equations, I worked out what my Rgate to be 2.36 ohms. where Rtest was a 470ohm ceramic block ...
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43 views

How to simulate double pulse test in LTSPICE and view switching losses

Please how do i simulate double pulse test in LTSPICE and view switching losses like Eon, Eoff as well as power loss.
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5answers
208 views

Improving dV/dt turn-on immunity of a mosfet without increasing turn-off time

I'm designing a solid state battery disconnect switch and I want to improve the mosfets' turn-on immunity (high dV/dt on Vds) without impacting the turn-off time. I don't really care about the turn-on ...
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1answer
47 views

MOSFET Voltage Spikes

I have a voltage source that has a square wave between 20V and 35V with 12.5khz frequency. Even i fully close the MOSFET, it is still conducting in rising and and falling edges of voltage source. How ...
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1answer
46 views

Electronically Actuated DPDT Switch?

I am trying to be able to dynamically switch two wires on a brushless motor ESC for a Quadcopter. The plan is to wire an arduino to the flight controller so that I can program it to switch the ESC ...
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2answers
70 views

Upgrade BLDC motor controller (ESC) to higher wattage (replace mosfets/shunt)

I was wondering if I could upgrade my current bldc motor controller (three phase motor)(*) to a higher wattage/output power by doing the following modifications: Replace mosfets with higher power ...
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0answers
26 views

Awning control for closing

Awning currently controlled by simple 120vac up/down switch and an upper limit switch. Down is stopped by manually flipping switch. Need to close awning when wind storm occurs. Have an Adafruit ...
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2answers
169 views

Removing voltage spikes and overshoots using power MOSFET as switch and 555 timer as pulse generator

I'm trying to turn on a power LED using LM555 timer as input signal of IRF630N N-channel power MOSFET as Fig1. Fig1. pulse generator and switching circuit. Here is the output of LM555 Timer (Not ...
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21 views

SIZING steps and Interpreting Mosfet datasheet

After reading those Interpreting Maximum Power of a MOSFET from the datasheet How to interpret Vgs(th) min/max in a MOSFET datasheet? https://www.infineon.com/dgdl/Infineon-...
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2answers
36 views

Power MOSFET internal diode: when does it conduct?

So I'm currently studying power MOSFETs and I'm getting a bit confused about when and how it conducts current. Let's start with the normal MOSFET functioning. I'm considering a n-enhancement type ...
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0answers
57 views

VDS Fault on A4964 BLDC motor Driver

I am actually designing a BLDC motor control unit with the A4964 Driver. I made the design for working on 24V supply. I did severals test and HW/SW modification but unfortunaly, the motor won't run ...
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54 views

Mosfet control Rds on , and Vgs

I want to know how to calculate Vgs , assuming load current Id is constant , Vd = voltage of battery is constant , and fet is operating in thermal stability region , so there is no thermal runnawy , ...
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40 views

How much does the gate charge of a MOSFET change over lifetime?

Is the total gate charge of a silicon power MOSFET changing over lifetime, as long as it is used inside its rated operation conditions? I am using a SIHB6N65E (650 V, 600 mOhm) were the datasheet ...
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1answer
100 views

High side MOSFET driver with transformer

I am reading the application note " Fundamentals of MOSFET and IGBT Gate Driver Circuits" written by Texas Instrument. In order to control High Side MOSFET, the application note suggests to use this ...
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0answers
34 views

N Channel Power MOSFET as a Switch

I am trying to use a N-Channel Power MOSFET to turn on a capacitor bank in my MRI birdcage coil. I tried using PIN diodes as a switch but they kept failing as they could not handle 400 V and 9 A that ...
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2answers
77 views

Isolated MOSFET gate driver VCC and VDD power suppl

I am planning to use UCC21520 for HV SiC MOSFET based full bridge design. My operation frequency would be around 100kHz. I selected UCC21520 in order to achieve the isolation between the power and ...
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2answers
114 views

Mosfet Driver IRS2007 failure when running with mosfet IRFB3607

I am designing a BLDC motor controller and facing some issues with using an IRS2007 along with IRFB3607. For one phase, the high side and low side give clean wave forms as long as V_Pow is ...
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1answer
66 views

What the maximum possible temperature that a MOSFET can reach?

I'm choosing a switch for a power supply design. I would like to know the highest temperature the MOSFET can reach. The switch that I'm using is DMT3020LDV. An input having 24V and 8A is supplied to ...
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1answer
181 views

Designing MOSFET bridge rectifiers for high voltages

I've been looking into MOSFET bridge rectifiers, also known as "zero IQ" rectifiers, as a replacement for traditional diode-based bridge rectifiers. Here's a simple example: The benefit, of course, ...
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1answer
84 views

Is it possible to reduce the Miller's plateau voltage?

Consider the following circuit: Image source: Simplified Clamped Inductive Switching Model - Figure 3 from "Fundamentals of MOSFET and IGBT Gate Drive Circuits by Texas Instruments" I would like to ...
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33 views

How do I avoid a high DC current flowing through mosfet in my SRSSTC tesla coil?

There are 6.48 amps flowing through the mosfet but only 12 mA through the capacitor, L2 would be my tesla coil primary. How can I reduce the amount of components in my circuit and improve its ...
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1answer
62 views

3d printer MOSFET can't use on car bulb, but can use on other load (ie. LED, dc motor, relay)

I want to use a MOSFET that can handle high current use for switching, so I decided to use the external MOSFET for 3d printer. I tested it out on other loads such as motor, LED, relay it is able to ...
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4answers
109 views

Do Protected Power MOSFETs need a flyback diodes?

There are protected MOSFETs under various marketing names available (e.g. omnifet, hitfet, intellifet, etc). These devices include clamping diodes and overcurrent/temperature protection. They also ...
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41 views

Can someone explain this high-speed P-channel MOSFET drive circuitry?

I found this circuit in an application note on P-Channel Power MOSFETS. The note explains that modern technology has made it possible for P-Channel MOSFETS to approach N-Channel performance in power ...
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162 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
39 views

N-MOSFET not passing current when gate is high (SPICE)

I'm having a very strange issue with some power MOSFET circuits I'm trying to build for regulated high-current pulses. I can get my circuit to work fine when I use a lower-amperage power MOSFET, but ...
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2answers
312 views

Resistance of mosfet's internal diode

I am an IoT solutions developer and not an engineer, so please excuse my vocabulary if not upto the mark. I have used Mosfets such as FDD6637 and IRF9310 in my circuits for power switching and they ...
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3answers
56 views

Comparison of the SOAs of two MOSFETs

Below the SOA for the IXFP6N120P: And the SOA for the IRFBG30: The first one shows a DC line beyond 100 ms, but the second one does not. Does this mean the second one is unreliable beyond 10 ms, or ...
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85 views

MOSFET activates every time when ESP32 is restarted

I am using ESP32 (GPIO-13) and RFP30N06LE to control my load (Motor). Everything works fine until i restart/reset the board, Motor starts irrespective of state (ON/OFF). I tried adding pull-down but ...
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25 views

Smart High and Low Side Mosfet

For example I have two smart high or low side mosfet that have 4 channel. One high side driver has 1 amper per channel. Other high side has 2 amper per channel. I tested these smart high side mosfet ...
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1answer
103 views

Using series of LM 78XX for power supply

I'm new in electronics. I want provide 9V (VVD9) and 5V (VCC) for my electronic board including power mosfets (IRF 3205), high power LED (14V-3.5A), micro-controller (at-mega16), and etc. I use this ...
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1answer
77 views

Need for 2 drains in a MOSFET? [duplicate]

Iam looking at the datasheet of a dual MOSFET (IRF9358PbF.) which contains 2 drain pins and 1 source pin for each MOSFET. What is the purpose of having 2 drains, when there is only 1 source pin? Is ...
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1answer
68 views

Power Mosfet Information Mismatch: On Region Characteristics vs Total Charge Graphs

I'm dealing with Power N-Chanel Mosfets and, while looking at the data sheet of several units, I noticed that the information about the On-Region (\$ I_{D}\$ vs \$ V_{DS}\$) and the Gate Charge (\$ V_{...
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1answer
62 views

MOSFET switching seeing unneccessary pulse during Power ON

We have a MOSFET switching circuit to switch secondary(battery 5V) supply to load if power lost on primary(12V). Circuit works fine currently. But i am seeing a LOW pulse on highlighted red net in ...
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2answers
332 views

Is it possible to make an IGBT to work at duty cycles up to 100%?

I am designing an IGBT based chopper with single Low side switching IGBT (chosen low side switching because ease of driving the IGBT.) There are plenty of resources available for SMPS (buck, boost, ...
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38 views

MOSFETs Cascode Configuration

The following schematic is from Texas Instruments: http://www.ti.com/tool/PMP10195 I have some questions on it: Is Q1 always on? How do I calculate the voltage that the gate sees? It looks like this ...
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1answer
68 views

MOSFET and TVS Voltage requirements for 120V single phase AC circuit

I am designing a circuit that will gate single phase 120V AC through back-to-back N-channel MOSFETs connected as shown below. When passing AC, one MOSFET is on and the body diode in the other is ...
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70 views

Driving Parallel Mosfets

I have a total of 20 IRF3205 mosfets in a H bridge configuration for switching a transfromer to get pure sine wave output. (Five mosfets at each end of thr H bridge). Datasheet says total gate charge ...
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150 views

Problem driving MOSFET with ACPL 337J optocoupler

I want to drive a mosfet. I am using an ACPL 337J optocoupler to drive it. Here is the schematic:- But I am facing problem while driving the mosfet. The signal at gate of mosfet should be a PWM but ...
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2answers
733 views

15kV High voltage pulse generator circuit how to have digital control?

first of all I'm fairly new to making a more complicated circuit. I'm trying to make a PCB with an ATmega328PB chip on it. And with that chip I want to control a High voltage pulse generator (Arc ...