Questions tagged [gate-driving]

Interfacing between control signals and power switches, like MOSFETs and IGBTs; charging the gate capacitor of a transistor to the voltage required to make it switch while supplying enough current to make it switch at the required speed.

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does this npn gate driver circuit work?

this is a mosfet driver for a full bridge inverter. Does the circuit prevent the mosfet from turning on when the circuit is powered?
Lethabo juinor's user avatar
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EL7457 alternative with larger negative voltages? [closed]

I'm looking for a gate driver similar to the EL7457, but that can handle larger negative voltages up (down) to -10V. The EL7457 is limited to -5V. Is there a device that can be purchased and directly ...
vjalle's user avatar
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How to determine rise and fall times of MOSFET

Rise and fall times of a PWM switching MOSFET must be paid attention because too slow switching times will decrease the efficiency and too fast will cause ringing. I want to know how to choose a rise ...
CaveScientist's user avatar
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How to calculate required gate resistance

I want to limit the rise and fall times of a MOSFET with a gate resistor to prevent large EMI. My calculation is as below: ...
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How to replace voltage source with other component to get constant voltage of 3.5v

Anyone knows how to replace the voltage source in the circuit but still get the same waveform?My intention is to get the green waveform, but replacing 3.5V voltage source with other components. I ...
User691's user avatar
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Is that shoot through in phase leg configuration?

I am doing simulation using phase leg configuration. Anyone know why there is current spike at around 1.1us? (the last subplot). From the plot, is there a shoot through happen? The spike in blue trace ...
User691's user avatar
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How to interpret Ids of low-side FET in phase leg configuration?

I am simulating a phase leg configuration as shown below using a GS66508T GaN FET. Does anyone know if the circuit is working correctly according to the current plot? There is current spike above 30 A....
User691's user avatar
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Gate driving circuit loss [closed]

I am doing a gate driving circuit for GaN FET in LTSpice. Does anyone know how to calculate the total loss for this circuit? I understand there is gate drive loss, conduction loss, switching loss etc. ...
User691's user avatar
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Will my gate driver work for this situation?

This is my own design, I did a gate driver for the MOSFET. Would this design work, or should I instead use a gate driver IC?
İbrahim İpek's user avatar
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Switching Freq. and Output voltage error

Attached is the datasheet for the Synchronous Buck Controller: https://www.ti.com/lit/ds/snvsb32b/snvsb32b.pdf?ts=1711536038118&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FLM5145EVM-HD-20A ...
Andr7's user avatar
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Is Vgs a concern when using a high-side FET driver?

I would like to use the MIC5014 to drive an N-channel MOSFET as a high-side switch. My supply voltage in this system is 24 V. I understand that the MIC5014/MIC5015 uses an internal charge-pump to ...
BonsaiOak's user avatar
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How necessary are gate resistors for MOSFET gate driving?

I've been studying MOSFET gate driving recently, aiming to understand the importance of layout. To investigate this, I designed a PCB as shown below: In this PCB, I used the FD6288T (https://static....
0x1a551e2's user avatar
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Can I use the RV-3028-C7 INT pin as a PSW switch?

The RV-1805-C3 has a PSW pin that can be configured as an output switch. The RV-3028-C7 does not have such a pin, it only has an INT pin. I need to periodically power ON my MCU, do stuff, and then ...
Miguel Tomás's user avatar
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Debugging BLDC gate driver, unexpected back EMF waveform

I'm debugging an electronic speed controller I designed that uses a 3-phase gate driver, DRV8300DRGER, to control BLDC motors. The circuit is shown here (the 2 other phase aren't shown) with the ...
ken's user avatar
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Power Up Delay Time of Gate Driver

Can someone please explain it to me what does these delay times (highlighted in red box) practically mean during the operation of the gate driver? Attached is the datasheet for the same: https://www....
Andr7's user avatar
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LTspice bootstrap half-bridge simulation peak current problem

I was working with the simulation I attach below. While testing my simulation I was confused when I observed a short circuit on the half bridge, and it did not get better when I added extra deadtime ...
MSB's user avatar
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IR2110 LTspice high-side switching problem

I am working on a half-bridge simulation in LTspice. For the gate drive circuit I am working with an IR2110. My problem is that whatever I select Vin to be above 200 V output, it can't pass 200 V. I ...
MSB's user avatar
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Gate driver input

I am giving a pulse input (from a microcontroller) to the INA/INB pin of the Gate Driver IC: https://www.ti.com/lit/ds/symlink/ucc21222-q1.pdf?ts=1708945816410&ref_url=https%253A%252F%252Fwww.ti....
Andr7's user avatar
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I want to run the high side switch without using the bootstrap

I'm making a circuit for study purposes. I want to deliver gate signal without using bootstrap method, overall circuit configuration is as follows. The problem is operating the secondary high side ...
kogyu's user avatar
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Using TL431/ATL431 to make UV lockout circuit for gate driver IC

I am using UCC5350 (isolated gate driver) in 3 phase bridge circuit, sadly I decided later in the project to use isolated Bipolar dc/dc converter MGJ2D241509SC (+15/-9) for gate drive supply. 15 V ...
Eng Sam's user avatar
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I want to drive half bridge using gate driver that doesn't use bootstrap method

First of all, it can be unnatural using a translator. I'm sorry. I'm trying to drive the high side switch through gate driver that doesn't use bootstrap method. I think we can use optocoupler type ...
kogyu's user avatar
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1 answer
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How to mitigate this transient with huge magnitude at turn on interval for a MOSFET tested in double pulse test setup In LTspice?

I am doing a spice simulation to characterize the switching behavior and switching losses for MOSFET I want to use in my three phase inverter application. I am using a 60 V, 3 mΩ Si MOSFET from ONSEMI ...
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Controlling a IR2110 with PFM for Half Bridge Circuit [closed]

I am curious about how to select Cboot for desired control frequency range. https://www.infineon.com/dgdl/Infineon-Bootstrap_Network_Analysis-ApplicationNotes-v01_00-EN.pdf?fileId=...
MSB's user avatar
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Double pulse generation

I want to generate a double pulse with an initial delay of 50us (initial delay is power-up delay time for the gate driver IC.) The first pulse should be of 1.2 micro seconds and then off for 0.7 ...
Andr7's user avatar
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Double Pulse Schematic

I had a doubt in the schematic of the gate driver part of the following double pulse test circuit. Do I need to connect the source pin of Q2 to VDDB? What will be the path of the current during ON and ...
Andr7's user avatar
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How can I build a bipolar (+Vgs,on/ -Vgs,off) driver with BJTs for MOSFETs?

I am beginner in driver circuitry. I am trying to do a MOSFET driver that can work at over 300kHz with a current sink capability of 10A. I also want it to give a bipolar output like -10/30V. I found ...
DidiNano's user avatar
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3 answers
473 views

LED driving circuit, related to MOSFET V(gs)

The N-MOS used is an IRF3710. If you look at the IRF3710 datasheet, VGS is ±20 V. However, in the picture, 24 V is added to VGS. PWM signal: 24 VDC, 0 VDC Is it okay to think of it this way? What I'm ...
contain's user avatar
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Why do we need a small external gate to source capacitor for a MOSFET drive circuit?

I have a question regarding a MOSFET half bridge driver circuit. We always connect a small capcitor between the gate and source of both the high side and the low side switch, typically in picofarads. ...
Alison's user avatar
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Turn on control of antiparallel SCRs to pass AC

If you are trying to pass an AC signal through antiparallel SCRs (there to isolate the signal when required) where the AC frequency is low enough to satisfy the turn-off time requirements during the ...
Paul's user avatar
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3 votes
2 answers
429 views

Is this really low gate resistance normal for this power MOSFET?

In the datasheet of the IRF540 power MOSFET there are two different statements about the input gate resistance. At the end of page one, it says that with VDD = 25 V and TJ = 25 °C, the input gate ...
Kinka-Byo's user avatar
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Bias up and down sequence of a GaN power amplifier

I am trying to build a biasing sequence circuit for a GaN power amplifier. The GaN power amplifier I am using has a particular bias-up and bias-down sequence as shown below: The figure below is a ...
Sahasra Vaiishnavi's user avatar
1 vote
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81 views

MOSFET parasitic turn-on

I'm simulating a circuit which uses a high-voltage SiC N-channel FET to discharge a large voltage (something close to the breakdown voltage of the FET, 1.7 kV). The power supply for the circuit is a 1 ...
L30LVC's user avatar
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1 answer
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Gate driver selection for digitally controlled via PFM, LLC resonant half bridge charger

I am designing a LLC half bridge charger. I am going to use a microcontroller to control the switching frequency, with feedback from the output to smoothly control the switching requency. I don't ...
MSB's user avatar
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1 answer
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Gate switching - Guitar signal gate controlled by another signal

The circuit below is based on a noise gate and a JFET based switching circuits. The idea is to mute the guitar signal when another signal pases certain threshold of volume (like a reversed gate ...
Electrical Voyager's user avatar
1 vote
1 answer
26 views

Relationship between value of the totem pole output of the gate driver and the speed of turning ON of the MOSFET

We are using LT1243 gate driver for turning ON a MOSFET: if you see the datasheet of the LT1243, then we will know it has a high totem pole output of 1 A. which means that driver will drive a current ...
Fredrick's user avatar
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4 votes
5 answers
2k views

Sizing the gate resistor for power

There are many questions and answers regarding the value of the gate resistor, ranging from "anything will do" to "put something and see what happens". But even to put something ...
Maple's user avatar
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ATSAME70 driving MOSFET, which gate-resistor to use?

I designed a board with an ATSAME70 on it, which uses small SI2342DS MOSFETs to drive LEDs. I need to figure out which value gate resistor I need to use for this, or if maybe setting the drive ...
Jenny's user avatar
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6 votes
4 answers
714 views

Why gate drivers have series resistors on gates?

Although gate drivers are often used to interface low-voltage logic with high gate thresholds, it is my understanding that their primary function is to ensure fast gate switching by supplying high ...
Maple's user avatar
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2 votes
1 answer
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Why are the FD6288T&Q gate driver logic inputs for high side switching connected to VCC?

I came across a datasheet for the FD6288T&Q MOSFET gate driver, which I would like to use in an ESC design. When I was incorporating it into the schematic for my ESC, I noticed that in the ...
Hans Owen's user avatar
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1 answer
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Gate Driver Output Wiring (TC4431)

I don't know how to how to properly wire the two outputs of the driver IC TC4431 to the MOSFET gate. In the datasheet, there's a test circuit diagram (@page7, FIG4-1), should I connect the outputs ...
Bikay's user avatar
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Optimization of gate resistance value for gate driver circut of a SiC MOSFET

I am struggling to tune in the RG_on and RG_off values of gate resistors for SiC MOSFET. I have tried a lot to tune in the values but at turn off transition there is persistence high frequency ringing ...
Alison's user avatar
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1 answer
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Problem with the output of a synchronous non-inverting buck-boost converter

I found this electronic circuit in an old research, along with the code necessary to operate it. When I applied it in the laboratory, the results were not the same as in the original research, not ...
loa rifa's user avatar
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82 views

Driving Gate from MCU (using 6N136 and TC4431)

This is my first time trying to use this optocoupler (6N136) I'm trying to control a MOSFET gate with the least switching delays (rise and fall timings) possible, while making the MCU isolated from ...
Bikay's user avatar
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2 votes
1 answer
84 views

Changing gate turn off voltage of SiC MOSFET from 0V to -4V

The design of sic gate driver circuit is designed to work at 0 V as gate turn off voltage. Due to some undamped ringing at turn off, I want to change the gate turn off voltage at -2 or -4V which is ...
Alison's user avatar
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0 votes
2 answers
116 views

Improving MOSFET switching timings (push-pull)

Based on my previous question here, as suggested I'm using a push-pull driver circuit to control a MOSFET gate. this is the circuit: And this is a simulation result: Vertical Divisions are 1 V, ...
Bikay's user avatar
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2 votes
1 answer
66 views

HIP4081 Full Bridge FET driver peak pull up/down current

The datasheet for the HIP4081A bridge driver references a limit of 2.5 A "pull up"/"down" current. I thought the maximum load current in a bridge is limited by the FETs themselves, ...
Freeman's user avatar
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2 votes
2 answers
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LM393’s LOW shows high Ohm to GND

In LM393 datasheet it’s connected to GND on LOW, and disconnected of everything on HIGH. But on my tester I see on LOW: 100 Ohm when no load’s GND connected to Out pin. (No load at all). 850 Ohm when ...
juanmf's user avatar
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1 vote
1 answer
137 views

Different gate resistors to turn on and turn off a MOSFET

I found that people use different gate resistors to turn on and turn off a MOSFET as shown below. Is there any reason behind this? Usually, the turn on resistor is higher than the turn off resistor. ...
user42423's user avatar
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2 votes
1 answer
221 views

How can I take parameters from power NMOS and power PMOS transistors and translate these into LTspice simulations?

I am trying to simulate NMOS and PMOS power transistors in LTspice, but I keep getting error messages about the NMOS being duplicate. Some of the earlier LTspice file is here. I am trying to have a ...
Stephen Elliott's user avatar
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1 answer
61 views

Two SCR thyristor modules using gates tied together to trigger

When I tie the gates of a MCC 95-16 together, it conducts AC at decreasing gate milliamps as I raise input voltage. Is this acceptable to power a microwave transformer? My zero crossing opto driver at ...
callmemac's user avatar

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