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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Formula to calc Id of this IRF3205 in the linear region from this specific voltage measure point

I was doing a project of a electronic load and I bought a hall effect sensor to measure the current through the mosfets in this project. Due to some instability in the hall effect sensor, I needed to ...
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3 answers
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Why is this transistor in my bootstrap driver failing?

I'm trying to implement a bootstrap switch circuit for an N-channel high side switch. I implemented the following circuit on a breadboard: Testing it with a 24V power supply and a grounded input ...
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How to drive multiple floating N-channel MOSFETs

I want drive a RGBW-LED (CREE XLamp XM-L) using a synchronous constant current buck. To control the brightness and color, the LED of each color channel is controlled by a shunt transistor using PWM. ...
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High side MOSFET gate driver for pure DC application (non PWM)

I want to drive a highside MOSFET which is supposed to be on for hours. I tried TI's approach of using a 555 timer and IR2110 but from my simulation on LTspice, the outputs at the HO pin of the ...
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Using H-bridge gate drivers to drive MOSFETs in non PWM applications

I am using IR2110 to drive a highside MOSFET which I intend to use to control the charging of a lithium ion battery (disconnecting it from the charger once full). I am not using any PWM control ...
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How do you determine that a MOSFET needs a gate driver as logic levels are not good for it?

I'm using an IRF620 MOSFET paired with a TC4420 high speed gate driver. Just using the MOSFET by itself with the Arduino does not work properly. It works a lot better and faster with a gate driver. ...
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Isolation high side MOSFET

I have high side MOSFET component VN7003ALH, with the following information, it has an input pin instead of a gate. As the electrical specification shows, the MOSFET drain and source voltage adjust ...
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How is output current of a MOSFET gate driver controlled?

So I have been studying a lot about gate drivers, and I understand calculation of the current requirement, but what I don't understand is how the output current of the driver IC regulated. In ...
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Can I drive only one MOSFET/IGBT in a DC chopper circuit using IR2112 driver?

I have a three phase inverter that is driven with 3 IR2112 drivers board and microcontroller. I want to take advantage of the board and take two wires from these drivers pins to trigger one MOSFET/...
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6 answers
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Can I drive a low-voltage MOSFET gate directly from a microcontroller?

We're working on this project for school where "reducing the number of components is essential". We need to operate a little brushed DC motor so we thought of using a simple low-side drive ...
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High- and low-side MOSFETs controlling one load

I have electromagnets I want to control using a Raspberry Pi. They run on 12V and each use 0.3A when briefly operating. For various reasons I want to control the positive and negative sides of each ...
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Automatic multiple switch ON when power is applied

I have made a switch as shown in the schematics to turn ON/OFF 24 loads. When I apply a pulse on the ON-signal the load gets 24 V and when an OFF-signal pulse is applied the 24 V at the load gets ...
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Distorted output waveform and snubber heating in 3level 3 phase inverter

We are working on 3-level 3-phase 400Hz inverter (110Vrms). The problem is that the output wave still have some harmonics of the switching frequency. The snubbers are heating up rapidly when connected ...
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How can I drive small motors with 3.7V PWM?

I want to use a small PWM driver PCB (that I hacked from a RC vibrator sex toy) to drive three other motors using a single 3.7V lithium-ion battery. (The motors are rated 3V.) The PWM driver ...
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How to make a separate common point for gate driver with 1 Voltage source?

So I'm trying to make a single board that can take care of bucking 120V to 56V. The circuit for that works. The TL494 Circuit below also works, and so does the gate driver circuit. This circuit works ...
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How to buck 120V DC to 56 DC?

I'm working on a project to power a 56 volt BMS with a buck converter that bucks 120V DC (rectified from 120AC) to 56V DC, but I've gotten to the point where I'm hard stuck. Here is what I have so far....
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Can this gate driver circuit work in real life?

I simulated this circuit and it seems to work. I would like to drive the gate of an n-channel MOSFET, where the source can be connected to a 24 V supply, so one can't just pull the gate down to 0 V (...
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Power loss in gate driver independent of duty cycle?

Inside a generic switch mode power supply a MOSFET is used. The switching frequency is \$f_{sw} = 300\text{kHz}\$ and the duty cycle is \$D=0.45\$. To drive the gate of a MOSFET, we use a gate driver ...
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What are low pass and high side driver MOSFET? [duplicate]

I am beginer in power electronics. I know that transistor are used either as amplifier or as a switch. While reading about MOSFET , I found the term i.e. low side and high side driver. So can anyone ...
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Turn two circuits on and off one at a time

simulate this circuit – Schematic created using CircuitLab I want to use two MOSFETs to supply power to two different circuits. However only one of these MOSFETs can be on at a time. One FET for ...
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Implementing MOSFET Driver & Simplifying MOSFET Switching Design

I am leaning a lot from the great community here, and I think I have a solution to my project of a high power Battery MOSFET switch. My previous questions was getting quite long, and I now have a ...
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What are the limitations of AC coupling a MOSFET gate?

I came up with this AC coupled half bridge for high positive and negative voltage output with logic level control that I cannot find in any resources about (probably due to wrong search terms): It ...
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Can you help me identify this integrated circuit component marked FH4 2103?

I ordered (among many other components) some half-bridge drivers about 2 months ago, verified only the packet labels on the items in the order, and put them away for later use. Fast-forward to today ...
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Power MOSFET gate driver: voltage and current levels

Following are the doubts on the gate driver section of a forward converter. Peak drive voltage = 7.4 V (Shouldn't it be higher, say 10 V or so, usually for driving power MOSFETS?) Peak MOSFET gate ...
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6 votes
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Why is increasing gate voltage beyond 'reasonable' limits not advantageous in power MOSFETs?

In a power MOSFETs datasheet I see Rds(on) specified at Vgs= +10V whereas +Vgs (absolute max) is +30V. Why do they (manufacturers) restrict to +10V while quoting Rds(on)? The manufacturer could have ...
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  • 2,051
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Switching between two power sources with two NMOS FETs

I need to create a test setup to do a long-term overvoltage test on a device. The specifications that need to comply with are given below: As you can see, I need a rise and fall time below three ...
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UCC27211 Gate Driver High Side Output Randomly Turns Off

I am operating a half bridge. The high side gate driver output randomly turns off. I am unable to identify why this may be happening. Attached is an image (Pink: HO, Cyan: HI, Green: LI, Blue: Vgs(LO)....
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2 votes
1 answer
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What is the best way to drive 4 relays and 4 MOSFETs (PWM) from an ESP32?

I have a project that will require switching of 4 x 5/12 V mini power relays and 4 MOSFETs (switching 12 V load up to 10 A maximum). I'm quite new to circuit and PCB design and I have been scouring ...
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1 answer
79 views

MOSFET motor driver burns up with battery [closed]

I am working on a robot. I have used a MOSFET bridge to drive the motors. The problem is that when I test the motor drive using a power supply the circuit works fine without any problem but when I ...
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Need help driving IRFP460 using 555 IC

I have put together a variable pulsed dc signal using 555 timer ic. I wan't to control a IRFP460 mosfet so that i can drive high current loads. I have found a circuit of mosfet driver on one of ...
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Switching a voltage higher than Vgs MOSFET

In order to drive a voltage higher than the M1 Vgs, I think that limiting the Vgs voltage with a zener diode could be a good idea. It will be only switched once per minute. By this I mean that high ...
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How to use MOSFET?

I'm having trouble understanding MOSFET. There is always a voltage at the drain pin (my case: MOSFET on 5 V, MOSFET off 4.8 V). I've tried n-channel irfz44n and p-channel irf4905, but the result is ...
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2 votes
1 answer
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Why use both a BJT and a MOSFET for switching a subcircuit?

I have seen a BJT used together with a MOSFET for a power switching in an actual circuit. Below the ON voltages I have indicated the OFF voltages in red color. What is the reason behind using such a ...
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2 answers
183 views

MOSFET drain ringing and Vds measurement with oscilloscope

Following circuit drives a 24V LED strip. Vin is a 3.3V 1kHz PWM signal coming from an ESP32 GPIO. The MCP1416 MOSFET driver converts the input signal to a 5V PWM with low output impedence. The MOSFET ...
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High-side none-inverting SOT-23-3 switch

It started with a typical simple high-side P-MOS battery supply switch with inverting logic. Vs = 3.3-4.2V. Vg = 0-2.8V. 0V on, Imax = 2.5A. A P-MOS with SOT-23-3 package was chosen and works fine. ...
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Ringing at input of digital isolator while driving a mosfet with high voltage and current

From a rectified main 230V supply + 4x120µF 400V capacitor, I'm driving a STW40N65M2 mosfet which commutes a big coil. Gate is driven by MCP14A0304T. Gate current is limited by a 30.9 Ohm resistor. ...
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Relay driver circuit causes 5V line to get pulled down

PLEASE NOTE: The schematic is slightly wrong. It is a MOSFET in my circuit, not the BC850 BJT. The actual part is: BVSS138LT1G Link to MOSFET part Problem Summary: In the circuit below, I'm turning on ...
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P-MOSFET driver

I need to drive a P-channel MOSFET from an output of a 74HC595 shift register which is controlled by an ESP32. The MOSFET load will be a high power LED. Once the register is latched the outputs will ...
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How to drive high side Pmos buck converter at 40+ voltages

I'm working on a buck converter that will have an input of 42V to 80V, switched at 200kHz with a max load of 5A. My load will require a duty cycle range of 75% to 100% I know the componenet selection ...
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LM358P doesnt respond to inputs

I am currently building a Li-ion cell capacity tester. The circuit has two parts, one that charges the cell, and one that discharges it, but I have removed the charging components to make the circuit ...
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1 vote
3 answers
69 views

Spanning the voltage gap between microprocessor and P-MOSFET

I need to control a high-side FET from an STM-8, to enable solar charging of 2x18650. The only pins I have left are PD4 and PD5 which are true open drain outputs: that would be perfect if I could use ...
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How can the NSI45020T1G claim to "turn on immediately"?

The On Semi NSI45020T1G, a simple two-terminal inline current regulator, claims in at least two places that it "turns on immediately". However, it cites a capacitance between 2.5 and 2.7 pF....
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Driving high side MOSFETs

I am designing a BMS using BQ76940 IC. I will be implementing high side MOSFETs for charging and discharging. I read in a theory document that in order to switch ON the MOSFETs in high side, the gate ...
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What component should I use to regulate power during runtime? [closed]

I have been thinking about a way to reduce heat produced by my resistive wire based on some user input. My circuit is basically a simple resistive wire and arduino, both powerd by Li-Ion battery pack ...
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1 vote
2 answers
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Best practices to avoid a MOSFET switch failing closed

I am designing a high-side solid-state relay to replace a mechanical solenoid. The solid-state relay uses an array of high-power MOSFETs connected in parallel. It has been tested and successfully ...
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Troubleshooting Skyper 32Pro R + Adapter Board 1 Skyper 32Pro R

Hello I am trying to test an IGBT SKM145GB066D with the Adapter Board 1 Skyper 32Pro R and gate driver Skyper 32 Pro R, but cannot make it work. I've spend 2 weeks trying, but it seems like some ...
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L6384: Expected waveforms on boot pin

Here my driver section using L6384: SD1 and SD2 are at 0V. On IN1 and ...
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3 answers
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What do they mean by current specs in datasheet: peak or average value?

I am using an Arduino DUE (Atmel SAM3X8E) to control my power MOSFET (IRLZ24N) through a Phtovoltaic MOSFET driver (Panasonic AVP1122). While reading there respective datasheets, I've been noticed ...
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At what value should I choose the MOSFET resistors for the MOSFET triggered by the MCU?

I have added a picture of my circuit. Vcc = 5 V and Rled = appr. 600 Ω. So, I_Rled_current = 6-7 mA. The MCU is an ATmega328p. MCU pd1 and pd2 are logical high and logical low. What should the values ...
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MOSFET Vds is too high when MOSFET turn on

Few days ago, I upload question about MOSFET driver getting too hot. That problem was solved by your help. thank you. But I have another problem. I connect 80ohm load to MOSFET like this figure. ...
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