Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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What is wrong with my double pulse test setup in LTspice?

I am trying to make double pulse test measurements in LTspice using the spice model of a MOSFET and gate driver we are using in our actual design. My setup seems to be not working as nothing is ...
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1 vote
2 answers
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What is the most used bi-polar output SMPS topology in gate driver isolation?

I have some questions concerning this schematic: What is the topology used here? I am guessing flyback without feedback circuitry. Why is the TPS40211 utilized here? Is it to provide more current? ...
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Searching for inductive gate driver that only needs input power supply [closed]

I am switching 250 V across a solenoid with an IGBT, and am finding that the noise transients induced by this switching causes other controller circuitry in my robot to reset. Currently the 250 V and ...
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42 views

IR2110 not working correctly in LTspice: Length shorter than recommended

I want to use an IR2110 gate driver in LTspice. I downloaded the model from the Infineon website and implemented the symbol in my LTspice circuit: I only want to use and test low-side switching, so ...
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Boost Converter Gate Drive IC

We are looking for a gate drive IC for a custom synchronous boost converter. The boost converter should cover a wide range of input and output voltages, for use with a solar cell to charge a battery. ...
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71 views

Driving the gate of a MOSFET using an isolated transformer

I am trying to drive a MOSFET using a TL494 IC. The controller IC is separated from the power circuit using a transformer. LTspice is unusually slow while simulating this circuit. This is my schematic:...
5 votes
1 answer
213 views

How to improve efficiency of a "dead simple" motor driver - are more MOSFETs better or not?

This is a follow-up of that question. The only reason I've got 8 transistors on that schematic is efficiency. I'm now trying to figure out whether switching losses are making it pointless to have so ...
1 vote
1 answer
64 views

Spikes on IGBT's turn-on waveforms

Here are the ideal IGBT turn-on waveforms and the actual waveforms from my own gate driver. What causes the spikes on the actual waveforms at t0? Idealized gate turn-on waveforms IGBT Turn-on ...
5 votes
3 answers
299 views

Optimal gate drive voltage for MOSFET in DC-DC

I am working on an application where a nMOS is switched at few hundred kHz in a buck DC-DC with its Vds max of 60V. I have the option to choose the gate drive voltage. Its one of the usual power ...
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1 vote
1 answer
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Code-Free FOC BLDC Controller Circuit Design Help - AMT49406

My team and I are are in need of designing our own BLDC motor controller and need some help with the circuit design. We want to stick with an FOC setup and avoid a sensor solution as those can be far ...
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2 votes
1 answer
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What kind of MOSFET gate driver is required for cell balancing in BMS?

I want to drive these MOSFETs which will be in the cell-balancing circuit that is part of the BMS. What kind of topology for gate drivers can be suitable for this system?
4 votes
1 answer
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Why does UCC27524 MOSFET driver keep breaking?

I'm using the following circuit to drive an electric pulse motor triggered by an optical switch and timing disk, which works very well, but the MOSFET driver (UCC27524P) keeps getting fried. If the ...
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1 vote
1 answer
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Current control loop compensation network

I have an application that uses n-channel Mosfet as a high-side switch controlled by an IC driver. The point of the Mosfet is to manage the inrush current to the load. I understand that the resistor ...
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3 votes
1 answer
138 views

Gate resistor necessary and value calculation

I want to drive the SiHD240N60E with the UCC27511A and I want it to switch as fast as possible. The PCB traces are very short so the resistance is just 1 mΩ. The voltage is 12 V. Now when I check the ...
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1 answer
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While choosing a MOSFET gate driver for a full bridge, what does one being "Tolerant to negative transient voltage, dV/dt immune" mean practically?

As part of designing an H-bridge module rated for 30V 50A operation, operating from a low ESR power source driving an unkown DC motor, I need to select a gate driver. The intention is for the circuit ...
3 votes
3 answers
129 views

Shoot-through inside gate driver ICs

We are driving a piezo transducer array with sub-1 μs pulses at an extremely low duty cycle. A single N-channel power MOSFET drives each transducer. Each power MOSFET transistor has a low side gate ...
0 votes
1 answer
34 views

Ripple problem when using a type III Compensator for buck boost converter

I need your help, and from my last question here, I understand I need a closed-loop for my design, which helps to reduce the output overshooting. Below is the plot. From the plot you can see my ...
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1 answer
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Using isolated gate driver for switching loads sans MOSFET

I am trying to simplify my circuit and use a single multi channel part for both driving high current MOSFETs and directly driving a much smaller inductive load without a MOSFET basically as a digital ...
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1 answer
105 views

Is a resistor between the gate and source of a MOSFET suggested even in an H-bridge configuration?

I've seen a couple application notes suggesting a gate to source resistor being added to help with depleting the gate charge when trying to turn off MOSFETs. At the moment I have an H-bridge that is ...
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2 answers
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Driving parallel MOSFETs individually

I have two MOSFETs in my circuit and I want to make it possible to actuate them individually and simultaneously, depending on what analog input I am giving with the joystick. Do I need one gate driver ...
-1 votes
1 answer
72 views

Calculation of IC driver resistance, gate resistance, and inductor value

I want to use a UC3843 PWM controller to drive a IRF2305 MOSFET (in a Ćuk converter). How can I calculate the resistor values for the IC input pin (pin 7) and the MOSFET gate? For example, in the IC ...
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0 answers
66 views

Bandwidth: voltage-source vs. current-source gate drivers

Why do voltage-source gate drivers provide low-to-medium bandwidth that does not work well for wide band gap devices, while current-source gate drivers provide hundreds of MHz of bandwidth?
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4 votes
3 answers
806 views

Why does a MOSFET gate respond to voltage and not current?

I am trying to make a variable resistor using a MOSFET, but the problem is that I don't want it to vary from voltage, but instead current. I understand that MOSFETs work by creating an electric field ...
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2 votes
2 answers
140 views

MOSFET gate failure caused by unknown reason

I have the below circuit (link to simulation). It represents the low-voltage interlock and high-voltage precharge & discharge circuit for my Formula SAE team's EV car. While most other FSAE teams ...
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1 answer
54 views

Power supply issues for half-bridge IGBT driver

We are designing an isolated power supply for our IGBT Driver. We took the reference design from this & this This is reference design 1: This is reference design 2: We are using a zener diode (...
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How can I properly terminate an unused gate driver channel?

I have a circuit where I need only one MOSFET to be controlled but I have a dual channel gate driver capable of driving both high and low side MOSFET. I only need the low side channel for the ...
1 vote
1 answer
166 views

Miller Capacitance causing IGBT to turn on in half-bridge

Some time ago I built a H-bridge with 5 paralleled IRFP250N and after a couple of blown-up IR2104s I came up with this driver design that was more about protecting the IC than anything else: Where: ...
5 votes
2 answers
242 views

What is the reason for the "back porch" current requirement on an SCR gate driver?

I am studying SCR gate drivers at the moment and I would like to understand their fundamentals. Looking at a SCR datasheet (for example, this one section 7 or this application note fig 6 p4,) one see ...
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1 answer
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Using BC547 instead of S8050

I found this schematic on a website. This is a buck converter. They used S8050 as the gate drive transistor. Can I use BC547 instead of that?
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2 answers
168 views

High-side gate driver PWM output signal isn't going all the way down to 0 and it's causing shoot through

Over the past week I have been facing this problem where my high-side driver isn't going all the way down to 0 as seen by the simulation below. My low-side driver puts out a good a PWM signal, ...
2 votes
1 answer
71 views

How is MOSFET gate resistor chosen?

I have been doing research on MOSFETS. I see that in a typical circuit that includes a MOSFET and a Driver IC, there is a gate resistor. I have done research on this gate resistor and I am aware that ...
0 votes
1 answer
91 views

Gate driver DRV8300 debugging

I want to use the DRV8300 to drive three half-bridges. However the schematics inside the datasheet does not seems to work. When I try to scope VDS, it seems VDS seems to be too small on the upper FET.
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-1 votes
2 answers
203 views

MOSFET Driver Base and Gate resistors and other input stage for PWM motor control

I have the below basic pwm circuit for speed controller of a 12V ~10A motor - I have seen this circuit but am unsure of how to select base or gate resistors. These should be to protect the gate from ...
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Maximum output voltage for a buck converter with IR2110 as its driver

I'm currently making a buck converter (rated output of 60V/10A) with IR2110 as its high side NMOS driver. The driver and buck converter circuit can be seen in fig 1 and 2. I've asked a bit on this ...
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1 answer
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Inconsistent behavior of MOSFET gate driver

I am working on a 7-level power micro-inverter which composed mainly by power MOSFETs. These logic-level MOSFETs (IRLZ24NS) are driven by separate photovoltaic gate drivers with integrated fast turn-...
11 votes
4 answers
1k views

How does this PNP transistor improve the switching performance of MOSFET?

My guess is PNP transistor might ensure fast turn off by shunting the gate capacitance (ie, when diode is reverse biased and the PNP is on.) Additional questions: Why is the gate current limiting ...
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1 vote
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How to determine if a gate/inverter can drive a fanout of 4 gates?

I have a circuit in which a driving inverter output (Fanout of 4) with equal Wn Wp sizing (m=4) is driving 4 other gates having same equal Wn Wp sizing (m=1). How to calculate if the inverter fanout ...
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2 answers
97 views

Driving a gate driver with another gate driver

I have an IC with integrated gate driver. This IC has an integrated logic, charge pump and gate driver section. Unfortunately, the rated voltage of my application is higher than the ICs rated voltage. ...
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3 answers
398 views

How is output current of a MOSFET gate driver controlled?

I have been studying a lot about gate drivers, and I understand the calculation of the current requirement, but what I don't understand is how the output current of the driver IC is regulated. ...
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How many times larger should the gate resistors be than the drain resistor?

I was asked this question in class and could not come to a concise answer. This is question was asked in terms of MOSFET design. Are there any general rules or guidelines to follow?
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Help in push-pull MOSFET circuit design (gate drivers)

Background: I need to drive a 24 volt device from a (buffered and optoisolated) GPIO output. The device connected may be either low- or high side switched, so I guess push-pull is the way to go. ...
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1 answer
83 views

VDD Half Bridge Driver from VBus?

The below diagram is from the first page of the Infineon IR2104 Half-Bridge Driver datasheet. I have a Vbus that is also the power source for this IC (or I want it to be). One presumes that the LO is ...
4 votes
2 answers
675 views

MOSFET in linear region

Can we work with a MOSFET only in the linear region? I want to use it as variable resistor so it can provide a fixed amount of current. The MOSFET SOA should not be violated.
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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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1 answer
181 views

SMPS Zener diode value in gate driver

I've got an industrial SMPS for a laboratory optical microscope that failed. When probing to measure for voltages I accidentally destroyed some components. In the attached image I hand traced the ...
3 votes
1 answer
365 views

How to make a deadtime circuit in a time of great shortage?

I found the only isolated gate driver on the market! It's all perfect, only doesn't have the deadtime circuit - the other part number is out of stock. I am willing to change the layout and add my own ...
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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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1 answer
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Are AO3400 MOSFETs good for my LED strip 'project'?

I read a lot about MOSFETs, but since I do not have much electronic background most official 'notes' are quite above my knowledge. So I hope someone can beware me of making some trivial mistakes. Why ...
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2 answers
188 views

How to control an LED strip with RaspberryPi/ESP32 using N-channel MOSFETs?

I am trying to control my LED-strip with N-channel MOSFETs. The problem is it won't turn off after removing the current from the hate. More details below. I bought these MOSFETs, and am currently ...
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0 answers
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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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