Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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62 views

Half-bridge transformer driver capacitors overheat

I'm trying to build a DSP plasma speaker using IR2104 half-bridge to drive a TV transformer. The switching frequency is between 15KHz-100KHz. I chose the topology from an old analog plasma speaker ...
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63 views

How to drive flyback transformer with digital input?

I'm building a DSP PWM plasma speaker and using a push-pull to drive a TV flyback transformer: This circuit is not flyback but it works. However I'd like to properly drive the flyback transformer ...
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1answer
68 views

Am I on the right track with my H-Bridge circuit

I have been trying to implement this H-bridge circuit to design a Class D amplifier. So far I have been able to correct a few little errors in the design. However, I am unsure whether the circuit is ...
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2answers
163 views

Maximum Vgs for MOSFETs with kelvin source

There are some MOSFET packages with an additional kelvin source pin that provides a low inductance driver source connection: Source: CREE C3M0060065J Datasheets also specify a maximum \$V_{GS}\$, for ...
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1answer
76 views

IR2110 output voltage problem

I have been working on a half bridge Tesla coil circuit. In process of building the Tesla coil, I have come across some problems. First of all, I’m using the IR2110 gate driver IC to drive the MOSFETs....
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1answer
76 views

MOSFET half-bridge taking too much time to close

I'm using IR2104 to drive two N-MOSFET, 2 kHz with very low duty. IR2104 is a half-bridge driver with fixed deadtime: This is the gate driver output without MOSFET: This is the MOSFET gate when ...
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1answer
66 views

I'm having trouble trying to design a Class D Amplifier. Does anyone have any tips on where I can start?

I'm aiming to design a 4 NMOS H-Bridge switching configuration. I understand that I am going to need: two half bridge gate drivers to driver the mosfets a comparator stage to compare the audible and ...
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34 views

Reference ground for Vgs on the source pin of an N-channel MOSFET

Hey fellas, So I'm trying to take advantage of n-channel mosfet's inherent low RdsOn, but also want a high-side configuration. I've got the following circuit here and it seems to work in this ...
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75 views

What happens if we apply a Gate to Source voltage above that the threshold voltage of the MOSFET [duplicate]

I have this NVB5860NL Power MOSFET. In the datasheet, it is given as the Gate Threshold voltage is 3V maximum. But that is for a condition of drain current in microamps. But, my condition is, I ...
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1answer
134 views

How do I deal with acoustic noise from a transformer under PWM load?

I am working on a hobby project involving controlling LED strips (working at 12 volt and drawing up to 5A). The light intensity of the strip is controlled using a single MOSFET transistor (...
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46 views

Should resistor R1 be in the gate of the CMOS transistor of the following schematic? (CMOS Transistor)

I'm analyzing the following circuit that is used to activate and deactivate a CMOS transistor which is used as a switch: simulate this circuit – Schematic created using CircuitLab I think that ...
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21 views

Double pulse test drain current not reaching peak

I want to have a double pulse test for the MOSFET. The drain current needs to reach 17 A peak. So to choose the capacitor and inductor I did the following, DC Bus voltage = 400 V $$L\dfrac{di}{dt} = ...
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36 views

Can I use the P3020L Mosfet with 5>Vgs>3 without any linear region consequences?

So I've been searching for a long time, for a power mosfet I can switch safely at a Vgs of 3V. I'd like to know if this is the one, because luckily, I recovered it from a computer power supply, thus I ...
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1answer
40 views

Gate spike in Synchronous Boost converter

I'm trying to build a synchronous boost converter. I'm getting the following spike in the gate. Yellow is gate voltage and blue is drain to source voltage. How to get rid of this spike in the gate? I ...
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1answer
79 views

Gate driver output 25% of PWM frequency - any idea how this is possible?

I am testing isolated gate driver IRS10752LPBF on the bench and I have a result I don't understand. The only change I made on my test rig compared to the typical application proposed in the datasheet ...
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32 views

MOSFET Gate Current Draw and Understanding Gate Driver IC Datasheets

I am building an ESC for a three phase BLDC motor based on the ST demo board STEVAL-ESC001V1. For the given motor I have currently decided on using a Nexperia PSMNR90-40SSH MOSFET. Based on the Vishay ...
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1answer
77 views

TVS/Bidirectional Zener for N-MOSFET Gate Protection

I am using a MOSFET to read a square wave, which usually ranges between -1 and 16 V. However, on occasion, the signal can reach values of -30 to 45 V. My current setup uses a Zener-protected STN3N45K3 ...
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46 views

Negative gate transients on high side half bridge FET

I am trying to simulate a half bridge for a 3 phase motor driver. When my high side FET transitions off, during the dead time, the switch node voltage is 25V. I would expect this voltage to be a ...
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37 views

High resistance between control ground and power ground of a gate driver IC in high-side configuration

I am working with a circuit configuration where a gate driver IC (ISO5852S) is used as a high-side gate driver and the bias supplies of this IC is coming from three isolated DC-DC converters. I intend ...
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1answer
56 views

IR2112 give out bad wave

I have connected an IR2112 as a low side gate driver in Proteus. Its output is very bad (blue graph.) It is even worse at higher frequency (given is 7812 Hz.) Is this how the IR2112 supposed to ...
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1answer
51 views

What to do with the /RST pin?

I'm using this gate driver IC. My question is, do I have to externally pull up the /RST pin? Because it can't be left floating, but I don't get the part that says "pulled down internally". ...
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2answers
88 views

What could have caused my high-side MOSFET gate driver to break?

I designed a small breakout board for the LTC7004 gate driver to test some high-power MOSFETs. While initially powering the circuit using a 12V AC adapter, everything worked fine and the gate drive ...
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45 views

H-Bridge gate driver HIP4082 damage

I made H-Bridge circuits with HIP4082IB & FDMS86101. It works good with 30V power, But some low-side FET & gate-driver die when 70V applied. Load is stepping motor, But problem even in without ...
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57 views

Full bridge inverter using IR2110 giving output in patches

I have made a full-bridge inverter using IR2110 IC. The MOSFETs used are IRF540n. The bootstrap capacitor is 4.7uf. The diodes used are 1N5819 high-frequency Schottky diodes. The operating frequency ...
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1answer
94 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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82 views

IGBT half bridge inverter not giving correct output

I am making a half-bridge square wave inverter using IGBTs (GW20NC60VD) and gate driver HCPL 3120. The input signal for the gate driver IC is taken from an Arduino. The signal is of 60KHz frequency. A ...
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3answers
79 views

Using a NMOS as High Side Switch for 48V battery

I am evaluating IR2125 and IRS20752LPBF and IR2184 high side gate drivers to drive a MOSFET that is to be used as a battery switch for a 48V battery, the continuous current from the battery is around ...
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3answers
58 views

High-Side N-Channel MOSFET Driving

Is this an acceptable way to drive a mosfet? In this case, I'm trying to turn on a high current load, but in case the load is changing it's resistance/impedance, or in the possibility it's ...
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1answer
65 views

IGBT vs MOSFET inverter (which is better)?

I am developing a full-bridge inverter with a working frequency of 100 kHz. I am confused about whether to use IGBTs or MOSFETs. The inverter is to output a 40V square wave signal. I have previously ...
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3answers
614 views

Using a miniature BNC connector on a PCB to measure high-frequency content with an oscilloscope

I am a power electronics engineer in R&D and often measure fast switching waveforms, specifically high bandwidth MOSFET gate signals. When connecting oscilloscope probes in the past I have found ...
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3answers
254 views

How to select a gate driver for a 100% duty cycle MOSFET switch

I am designing circuit with a high-side N-channel MOSFET switch. The switch will be operated at 100% duty cycle. I decided to use a high-side gate driver since they have internal circuitry to boost ...
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1answer
50 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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2answers
72 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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1answer
61 views

Choosing Full Bridge Gate Driver

I want to use an H-Bridge module as a switch in a 12V DC circuit and would prefer, if possible, for ease and simplicity, to use a full-bridge gate driver such as the IRS2453DS. The H-Bridge comprises ...
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1answer
53 views

Using Dual [High Side/Low Side] Isolated Gate Drivers

When in general is it easier, even preferable, to use a dual isolated gate driver on an H-bridge with IGBT power transistors, rather than separate high side and low side drivers; what if any are the ...
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63 views

Driving Power MOSFET with Optocoupler Problems (Component FOD3182)

simulate this circuit – Schematic created using CircuitLab So I am trying to build a BLDC motor controller using a Teensy4.0, FOD3182 Optocoupler, and some power mosfets. Currently I am working ...
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1answer
112 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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39 views

isolated Ground

I have a question regarding the ground connection of two isolated DC-DC converters. Is the connection advisable considering ground loops? Does it affect the safety? It is about the circuit seen below. ...
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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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1answer
43 views

Gate Driver Circuit Gives Unexpected Results!

I have designed around the LM5106MM/NOPB gate driver. Used two IPB017N10N5ATMA1 N-CHANNEL MOSFETS. This circuit has actually been used in another design in production by a engineering group beyond my ...
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39 views

Isolated gate driver for the Class D amplifer

I am trying to simulate the gate driver part for driving the MOSFETs in the class D amplifier with 4N25 optocoupler, not too sure if the connection between 4N25 and MOSFETs is correct.
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1answer
58 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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1answer
51 views

How to calculate number of turns, N for a gate driver transformer?

Update: Hi, my TA helped my issue. Thanks for everyone's help. It turns out, my area should be 12.2e-6.(I accidently wrote 12.2e-5). And, my understanding for ∆𝐵=2Bmax was wrong. The right way for me ...
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1answer
139 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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1answer
117 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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75 views

Help generating a 10Vpp squarewave at 13.56MHz

I'm working on a test fixture for which I need to generate a 10Vpp square wave, at 13.56MHz, capable of driving 250mA. My first attempt was a using opamps, but very quickly realized I can't drive ...
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2answers
47 views

BLDC low-side gate oscilations

I am developing the BLDC motor controller board and I have problems with low-side gate driving. I am using MC33035 BLDC motor controller. PWM for speed control is fed into low-side MOSFETs. High-side ...
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123 views

Hot-swap controllers vs load-switch circuits and bidirectional current flow

We've got a battery of 50V connected to a load that may regenerate power, hence a bidirectional current could be present. We'd like to be able to switch on and off the load. We're looking at load-...
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0answers
105 views

Gate Driver keeps burning

I'm designing an MPPT charger with a Synchronous Boost Converter using the LTC4444 gate driver. For prototyping I made a 1 layer pcb where I soldered all the components and added a few cables. The ...
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1answer
132 views

Output capacitance of MOSFET

I have read in several application notes that there exists a region called the Miller plateau where the current into the Cgd is large such that almost no current enters Cgs holding the Gate voltage ...

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