Questions tagged [mosfet-driver]

A circuit that accepts a small-signal digital input and produces as output a high current appropriate for driving the gate of a power MOSFET. See also the [gate-driving] tag.

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41 views

Controlling 60v with mosfet through pwm

I got this setup for controlling high voltage with PWM through a Mosfet ranging from 0-60v. Im using the PCA9685 for generating the PWM signals and then the mosfet FQP30N06L for controlling the ...
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45 views

SparkFun Power Driver Shield Kit for controlling 60 V input

I just bought SparkFun Power Driver Shield Kit. I read in the specifications that it was possible to control up to 60 V using PWM. I have got a project where I need to control 60 V with the PWM so I ...
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89 views

MOSFET Drive npn/pnp

I want to drive a MOSFET gate with about 10V. I use the following circuit as described in Fig. 4 http://tahmidmc.blogspot.com/2012/12/low-side-mosfet-drive-circuits-and_23.html Is this okay? How do I ...
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Mosfet driver IC for zero voltage switching [closed]

I am designing a 200khz inverter circuit with full-bridge topology to implement zero voltage switching. Where the MOSFET turns on with ZVS and turns off with ZCS. I'm using IRF150 and wanted to drive ...
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84 views

What is the purpose of a diode in parallel with a BJT in a MOSFET drive circuit?

This circuit shows a complementary emitter follower driving an IRF 150 MOSFET. The textbook says that a diode D provides a path for the discharge of the base-emitter junction capacitance of transistor ...
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90 views

Why doesn't this MOSFET driver work when load supply is isolated?

I need to use a mosfet driver in my next project. For this purpose I made a demo board with this schematics. My aim is to light the led by either applying a logic high level voltage from the control ...
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92 views

Half-bridge gate driver fried, how can I make my design work?

I made a half-bridge following the recommended schematics from the IRS2184 datasheet. However when I powered it, it triggered over-current and got quite hot. Here is are schematic and routing. I ...
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32 views

Isolated discrete GaNFET driver implementation for flyback converter, 500kHz [closed]

I am about to embark on a project of making a discrete GaNFET driver. It should be isolated with a signal transformer. Do you have any suggestions for literature or designs? Below is my current ...
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31 views

Burned the voltage regulator of a DC motor driver,

While I check the specs and thought the driver could handle it, after about an hour of discontinuous use, the driver stopped working... I used the following : Motor Specs: 24V 250w, rated current 13.4 ...
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24 views

load sharing circuit power supply and battery with turn off mechanism

I have my power supply VDD with 5 V. If my power supply is connected to the circuit, the MOSFET M1 should block my battery voltage. If the power supply is disconnected (VDD = 0), the transistor M1 ...
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83 views

Trying to understand MOSFET Turn on Procedure

I am trying to understand the mosfet turn on procedure. This is from the following application note by TI. https://www.ti.com/lit/ml/slua618a/slua618a.pdf?ts=1613979703351&ref_url=https%253A%252F%...
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411 views

MOSFET Drain - Source Current limiting

I am a new enthusiast to MOSFETS. I am trying to use a MOSFET to switch on and off a electromagnet that draws 5 amps at 1.2 volts using an Arduino. The circuit I am using has a diode going from the ...
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54 views

Switching high side of a circuit with an arduino and two n-channel mosfets

hello i have a sevenpointfive to 9 volt power supply and want to power a circuit which needs 5 volts. I have an arduino pro mini(3.3v version) and two n channel mosfets(irlz34n and irlz44n) i came up ...
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Do I need to use a MOSFET to drive 60 WS281Bs?

I’m building a custom keyboard and have 60 WS2812Bs as part of the backlighting system. I’m worried about the signal integrity as I’m using an STM32 and the max current on that pin is 25mA. Do I need ...
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137 views

Can a uC drive a MOSFET at 500Hz

I want to dim an LED strip. It's about 1.5m in total length and could work for prolonged time on a battery. If it weren't for the battery limitation I would probably just put a resistor in series, but ...
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56 views

Voltage Doubler PWM Circuit

I have the following circuit here, a high-side N-channel MOSFET driver, with gate voltages being generated via the circuit in the middle/NE555 section. I'm wondering, how does the voltage doubler ...
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18 views

charge pump with bootstrap gate driver

I was building a bootstrap based gate driver for BLDC motor control application.From this application note (https://www.infineon.com/dgdl/Infineon-HV_Floating_MOS_Gate_Drivers-ApplicationNotes-v01_00-...
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SG3525 Fixed output pulse (Without feed-back circuitry)

im making CDI circuit in which capacitor charges upto 300v and then discharge through the IGBT connected . but when i ground the capacitor the output voltage ground as well which is obvious. to ...
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91 views

How can I improve the design of my electronic speed controller?

We have a brushless motor with the following characteristics (Slow(8T)): For that motor, we are developing an electronic speed controller using the hall sensors. The microcontroller is an atmega328p ...
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63 views

Is this gate driver circuit sufficient to drive a parallel FET spot welder?

I am building a spot welder for attaching nickel strips to Li-Ion cells to make custom battery packs. There are plenty on the market but I wanted to use up some components and learn something. The ...
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41 views

High frequency inverter using irf540n

I want to make a square wave inverter for DC resonant converter. I have constructed this full-wave bridge inverter which is to work at frequencies of 50kHz to 100Khz. The input is 37V DC. The gate ...
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47 views

24V, 200W DC motor Control using N channel H bridge

I am trying to build a controller for a brushed DC motor. AIM:- To Run the motor at continuous load of about 8A. Rotate motor in both the directions i.e. forward and reverse. Control the speed of ...
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51 views

How to find Rsense value?

I want to use a current sense resistor (R54 in circuit) for overcurrent sensing. The rated drain current of the MOSFET is 17 A. Bus voltage is to be 100 V. Then would my sense resistor be R = V/I = ...
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39 views

Boost converter, why the voltage derates when frequency rises?

I am simulating a boost converter in ltspice. vin=3V, vout_bst=12V, ideal inductor, capacitor, diode and voltage source. When I use an ideal switch, raising the frequency doesn't affect the output ...
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82 views

What are the possible disadvantages of using this PNP transistor?

I read this application note from Fairchild Semiconductors, and was wondering about what the possible disadvantages could be if a PNP transistor is used to bypass the Miller current as shown in the ...
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45 views

Help using an FOD3182 OptoCoupler

So this is the Optocoupler I will be using: https://html.alldatasheet.com/html-pdf/505064/FAIRCHILD/FOD3182/978/2/FOD3182.html My question is with the schematic of the data-sheet. Using Ni-multisim I ...
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62 views

How to make IGBT/MOSFET gate driver circuit (5-10V) using push pull with transistors

I was trying to drive the gate of 25N120 IGBT (2800pF gate capacitance) with the help of transistors. The working voltage is 10V. I have tried with BC548 NPN and BC558 PNP. Everytime I apply PWM, the ...
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25 views

Strange A3941 motor driver behavior

I'm driving a 12V brushed DC motor using an A3941 full bridge mosfet driver. The setup is controlled using an STM32F407. Since the A3941's logic inputs need 5V, I'm using a MC74VHCT125A buffer between ...
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Confused on the notation from a TI datasheet

So I'm trying to implement this IC onto a controller that I'm designing: https://www.ti.com/product/UCC5350 I understand for the most part how to apply it, I am just lost on one key part The specific ...
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141 views

MOSFET failure (RN6020JNZ4) - all pins shorted

I've made a device to PWM a 20Ω load (a 5kW braking resistor) at 325V DC. PWM frequency is from 2kHz to 500kHz (it's used in a research project). I first tested the design with a smaller load (a 200W ...
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75 views

Back to back N-MOSFET on low side

I would like to disconnect the current in the system with a battery (using N-MOSFET in a back to back configuration). I would like the circuit to be on the low side and without a driver. At this point,...
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27 views

Differential transceiver SN65C1167

I have a question about a differential transceiver. In my application I am using a MCU to generate PWM signals for a gate driver board (CGD1200HB2P-BM2). This board, however, needs a diffierential PWM ...
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stack/ladder n- mosfets

I need to drive n-mosfets to switch on/off resistors in parallel with Lion cells. Each cell+mosfet is in a series - 50 cells. It looks much like a BMS except it NOT a BMS, but a cell test system. See ...
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Doubts in using UCC27537 Gate driver to drive IPA60R120P7XKSA1 MOSFET

I want to use UCC27537 gate driver to drive IPA60R120P7XKSA1 MOSFET but I have some doubts. To avoid voltage oscillations at the gate, do I need to include resistors in between MOSFET and gate-driver?...
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82 views

How can I calculate the dead time to prevent shoot-through?

From Figure 1 is evident that to get the dead time I must define the values for RC. E.g my resistor is 220 ohms and capacitor is 0.1uF this gives me 22us at 1-time constant, however, when I measure ...
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Supposed to be a trapezoidal BLDC Back-EMF waveform?

INTRO: The project bellow was designed in simulink to drive a BLDC motor. It has a matlab function that basically receives the rotor's angular speed (w) and using N = 6 (N is the number of pole pairs) ...
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28 views

A Driver Circuit for DC to AC Converter

I am simulating a DC to AC converter on LTSpice and I used if statements to make the circuit work. These if statements are located near the top of the image below, where the "lonely" voltage ...
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65 views

Is it safe to drive a 5V servo using a logic level shift board?

I would like to turn off and on a servo while it is not used. The LV would be 3.3V and the HV would be connected directly to s lithium battery. Could it work if I replace R4 with a servo? What problem ...
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How to disable IR2110?

I made a H bridge using 2 half drive like the picture this works fine, but how can I disable the driver IR2110? I'm afraid to put 0,0 in the input and that the driver will burn
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57 views

How to design a switching circuit with minimal voltage drop?

I am using a high side switch with BSS84 MOSFET. This is used to power on and off all the sensor and actuators during deep sleep of the uC. All the sensors are working except the SG90 servo. There is ...
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78 views

H bridge using MOSFET driver don't work

I am using the IR2110 drivers and this is the schematic of a half bridge, to obtain the complete H bridge I repeat the same circuit 2 times I measured the voltage between gate and source of each ...
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Is my LED driver fundamentally incorrect, or can I compensate it somehow?

I'm driving 3 tricolor LEDs from 3 PWM pins. They can't source enough current to drive them directly so I have them switching on some 2n7000s. Works great when each PWM corresponds to one color but... ...
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125 views

Where can I get obsolete MOSFET's from?

I have a Fusion5 tablet which is not working. There is a mosfet which gets very hot when I plug it in so 1st thing I want to replace. But I'm looked online and can not find where I can get a ...
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49 views

Why we need gate drivers and how much they are important in power electronics applications

Generally, there are low, high side, as well as half-bridge and full-bridge gate drivers, existing in the market. I am keen to learn the basics of all such gate drivers in view of power electronics ...
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248 views

Two BJT transistor vs driver for PWM MOSFET

In some books and articles they say that to protect the MOSFET from overheating when working in PWM mode two BJT transistors are used as in the image, others recommend the use of a driver for MOSFETs ...
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No Voltage on IR21844S HIGH OUTPUT (HO) pin

I need help, please. my IR21844S was working when SD (ShutDown active Low) is powered with High logic level (5V) and Vin with Low logic level (0V), IR21844S Low Side(LO) = Vcc Voltage and IR21844S ...
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36 views

BJT based mosfet driver, what resistor values to use?

I designed this MOSFET driver for a 24V motor with parts I have in my junkbox: The idea is basically Q2 and Q3 make a push-pull driver to drive the MOSFET gate to 0 or 24V. This allows the use of a ...
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1answer
127 views

Gate signal problem on my flyback

Here is my flyback converter design. Vin: 110V Vout: 24V Iout: 1A (max) Desired efficiency: 85% Transformer -> P1: 6T S1: 6T S2: 5T (aux) Vro: 24V EFD30 I determined 15uH for Lp Ls1: 15uH and Ls2: ...
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59 views

Calculating the MOSFET gate resistor for an H-bridge driver

I'm designing a DC motor driver using Allegro's A3941K driver. The block schematic shows a gate resistor for the MOSFETs. The A3941 gate structures are as below, The ...
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2answers
74 views

Driving a high-side N-channel FET

I'm currently using a LM5109B to attempt to drive a high-side N channel mosfet in a particular setup. I want to drive it independently of the low-side driver. I'm aware that the provided IC is used ...

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