Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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27 views

Implementing Active Miller Clamp

I am using UCC21732 gate driver IC. This has an external miller clamp, meaning the "Clamp" pin must be connected to the Gate of the external MOSFET. However, I want to build my own miller ...
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30 views

What is wrong with I_drain?

After adding an inductive load at the switching node of the half bridge circuit, the drain current keeps increasing. Why is this so? What have I done wrong in the circuit? I first tried to put L,C,R ...
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62 views

voltage spiking due to strong gate driver

If I make the PWM signal to gate very steep ( with rising time tr is very small like 200ps) then at rising time the gate ...
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1answer
94 views

Details about driving circuit of mosfet

I want to know the reason behind why this elements are connected in mosfet driver circuit. Basically I want to know the use of this elements . elements are (1)R1,R2 and diode in parallel with them (2)...
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34 views

Bootstrapping circuit in IR2101

Please explain how the bootstrapping circuit help in driving both the mosfets connected to IR2101 driver.Please explain this by taking an example of any voltage so that I can understand easily....
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35 views

Why is there a peak in drain current

I am simulating the double pulse test to test the working of the Overcurrent pin. Although I like that there is no phase lag between the sense voltage and the OC pin voltage, I am getting this peak in ...
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2answers
56 views

Understanding the IRS10752 Datasheet

I am looking at implementing a high side N channel MOSFET driver for some power switching circuitry I am working on. Plenty of great looking driver chips are out there, but they all cost $2.00 per ...
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1answer
47 views

Oscillating sense current in overcurrent protection

I'm stuck at overcurrent protection for SCT3160KL using UCC21732 (or UCC21750, trying to see differences in Desat and Overcurrent protection). This is my circuit Waveforms I see that there is a lot ...
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1answer
31 views

Controlling positive and negative voltage rail

I need to control and switch between positive and negative voltage rail at about 400 kHz with PWM signal at 50% duty cycle(Square wave). The positive rail is at about 150V and negative at -50V. It is ...
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3answers
50 views

Using logic level fet in switching application?

I want to create dc boost convertro based on microcontroller. If I only use low-side switch, can I just use logiclevel NFET instead of using gate-driver? I've planed to replace ir2110 + IRF540 with ...
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2answers
92 views

H-Brdige MOSFETs getting hot despite no load

I'm building a 600v H-Bridge using IPZA60R060 MOSFETs together with isolated gate drivers UCC21520. I designed the PCB layout to be as tight as possible and thought I'd done a good job routing the ...
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1answer
66 views

Overcurrent simulation for Mosfet

I am designing a gate driver for SCT3160KL using a UCC21732 gate driver ic from Texas Instruments. I have made roughly made the circuit using the ic, but I want to test its overcurrent protection ...
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1answer
68 views

High side MOSFET extremely hot in a half bridge circuit

The high side MOSFET becomes extremely hot when I try to run the half bridge, and the output does not seem right. The PWM signals to Hin and Lin come from an Arduino - 47.5% duty cycle, dead time of ...
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28 views

Asking for help about gate drive circuit of a bidirectional dc-dc converter

I have a 40V to 400V 500W bidirectional DC-DC converter as shown the image below. I have trouble designing the gate drive circuit of the switches at the top of the circuit ( I mean S1 to S4 ) because ...
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3answers
90 views

Calculating MOSFET gate current at certain PWM frequency

I want to power the gate of an IRLB3034 MOSFET by a PWM output from an arduino. I know that the current required to charge the gate increases, the higher the switching frequency is. With 5v powering ...
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26 views

BMS won't output voltage despite good LiPo Cells

I have an 20 cell LiPo battery pack that is healthy at 80V in total, the BMS uses 12 MOSFETs in parallel to switch the negative terminal and they all seem healthy but won't switch on, so I can't get a ...
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53 views

SiC MOSFET gate resistance

I am making a gate driver circuit for SCT3160KL using this isolated gate driver IC from Texas Instruments - UCC21750-Q1. The problem I'm facing is the selection of external gate resistance. I require ...
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1answer
29 views

compare half-bridge drivers IC for maximizing the quality/price

I selected a couple of Half-Bridge Drivers Gate for my BLDC project from well-known companies they nearly have the same specifications for my Mosfets such as voltage operation and Temperature range As ...
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40 views

What is optimal way to supply voltage for MOSFET gate driver circuit

Most FET Vgs are about 7 to 15V, if we use supply voltage in this range we can feed supply voltage to gate driver ICs or circuit. But, what if our circuit work on higher supply voltage range,says 9 to ...
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2answers
20 views

Not sure how to use Half Bridge Gate Driver (LIN being in/out of phase and more in general)

I am relatively new about semiconductors and I recently realized that driving MOSFETs requires a middle circuit for most microcontrollers. I followed schematics shared in this tutorial, except I ...
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1answer
67 views

Switching PMOS issue

i wanted to make a nand gate circuit for driving a few amp loads using pmfets. in my desgin im using DMP4010SK3Qfets, and any transistor thats capable of handeling 24+ volts on the collector. my ...
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2answers
160 views

Solution for how to drive a P-Channel MOSFET when Gate/Source voltage is too low?

I have used this forum to lookup solutions and suggestions from time to time but this is my first ever post! There are many great P and N-Channel MOSFET Questions and Answers in here, but I cannot ...
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2answers
192 views

MOSFET Driving problem

I have this MOSFET Driver IC 16 Pin Package Specification - Maximum Drain Voltage 16V. Maximum Drain Current 7.5A EDIT: Schematic : All the Enable, Sen and Sel signals will be provided by a separate ...
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41 views

Common Source vs. Common Drain for N-Channel Switches

Most discrete load switches I have seen (Using N-Channel FETs) have been in the common-source configuration. What, if any, are the operational differences between this and the common-drain ...
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1answer
26 views

Issue with n channel mosfet switching with an isolated gate drive

I am trying to make a n-channel mosfet switch a load from a high voltage (250V). I am using the n channel C2M0280120D mosfet. the circuit looks something like below: simulate this circuit – ...
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29 views

Identification of IC - Top marking number 3SDM

I could not find the part number from the IC top marking. The top marking shows 3SDM. I am looking for the manufacturing part number of this top marking. Added circuit diagram for better understanding
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1answer
37 views

IC datasheet and MOSFET selection question

I am trying to design a buck converter using TI's LM3150 synchronous buck controller and I am wondering how to read some of these specs and how to select MOSFETs based on gate charge: https://www.ti....
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29 views

Stepper Driver TMC5160 strange mosfet behaviour

So I made stepper driver PCB with the TMC5160 (datasheet) but I noticed something weird about about one of the motor outputs. Of the 4 motor outputs (A1, A2, B1 and B2) B2 always seems to have some ...
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47 views

Shoot through problem in 3-phase BLDC controller circuit

I have designed a 3-phase controller for a BLDC motor. I am checking one side of the bridge with a Pico-scope for shoot through. The wave-forms below are indicating that i am getting shoot through, ...
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2answers
87 views

Functionality of IR2101 driver

Please tell me the use of high-side floating supply voltage (VB) and high-side floating supply offset voltage (VS) in the IR2101 (datasheet) driver circuit and also the use of capacitor between them.
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1answer
170 views

Question about symbol in front of MOSFET GATE

I hope you are safety & healthy. I have a question about symbol in front of MOSFET GATE. The circuit that Im analyzing transforms almost ~311 V filtered and rectified DC to 48V DC. As In images I ...
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49 views

Switching between power sources with microcontroller

I need a way to switch a load(a high power LED) between two different power sources(50v and 100v) using a logic signal, quickly(<500us) and repeatably. I was going to use an n-channel high side ...
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1answer
37 views

What is the current in a FET as gate voltage is increased towards large voltages?

I know that beyond a threshold voltage VGS, increasing the gate-source voltage VGS in a field-effect transistor (FET) increases the drain-source current IDS quadratically. I've looked on the web and ...
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33 views

Gate drive circuit for 1500VDC two switch flyback converter

I am designing two switch flyback converter for 1500VDC input solar application. I am little bit confused while selecting gate driver circuit, specially for high side gate drive. I didn't find any ...
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85 views

Half Bridge Bootstrap configuration using IR2184 Gate Driver

I am planning on building a half bridge inverter for use as a tesla coil driver, using a couple of IGBTs, with gates driven by an IR2184 half bridge gate driver. According to the data-sheet, the ...
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2answers
71 views

How is dead time in a half bridge implemented

I was wondering if dead-time in a bridge design is achieved by the turn-on and turn off resistors as shown below, so that the FETs turn on slower and turn off faster, thus avoiding shoot through. Or ...
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1answer
84 views

Calculation of MOSFET gate drive current

I know that there have been many posts on this topic, but I'm confused about calculating the gate current of a MOSFET. I have calculated the gate current as Igs = Qg/t. For example, I want to drive ...
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36 views

Calculating MOSFET gate current with \$Q_\text{total} = I_\text{gate} \cdot t\$

Hi I am using the MOSFET IRFP4368. I want to use the equation $$ Q_\text{total} = I_\text{gate} \cdot t $$ to calculate the required gate current of my MOSFET driver. I have my total \$Q_\text{total}...
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1answer
37 views

How to determine the value for the gate resistor (Rg) of a MOSFET in low side configuration?

Once the FSR is pressed the output of the comparator should go high. This, will drive the MOSFET ON which has a DC motor on its drain terminal. I was wondering how can I determine the value in ohms of ...
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1answer
38 views

ESP32wroom pull down 12V P-channel mosfet gate

I am switching a circuit with a resistive and inductive load that is supplied with 12V using a p-channel mosfet. I already have the option to switch the p-channel mosfet with a mechanical switch (SW3) ...
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1answer
30 views

Half-Bridge Start-up State

I recently started to start working on a project where I started using a half-bridge to turn on and off a device that normally plugs into a wall outlet (120 VAC, 60 Hz). In the future, I am looking to ...
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2answers
183 views

IGBT won't turn off

I have built the following circuit as a static AC switch (no high frequency switching). The IGBT is a dual common-emitter module (https://www.infineon.com/dgdl/Infineon-FF300R12KT3_E-DS-v02_00-en_de....
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3answers
376 views

Do I really need the N-MOS driver here?

In this circuit I am wondering if I really need the n-channel mosfet to control my dual p-channel MOSFET. I think I can drive this straight from the micro. Just want to second opinion before I modify ...
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1answer
52 views

Half bridge Gate Driver UVLO

I am interested in designing a BLDC motor driver capable of operating at low supply voltages and relatively high currents (i.e. a device capable of operating with a 3V minimum supply and a phase ...
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227 views

Modelling of center tapped transformer in SPICE and driving it with switches

I am using SPICE engine (LTSpice) to model a center tapped transformer and then drive its primary side (center tapped) using MOS switches as follows: What I am expecting to see at the output ...
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2answers
59 views

MOSFET gate spikes when load is disconnected

I have a system that has two fan banks driven by MOSFETs. The fans are mounted on two sides of the enclosure on ~2 ft cables. After one second from system turn-on the microcontroller turns these FETs ...
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3answers
106 views

Why we need two resistors to control the gate voltage of a PUT transistor?

Looking the follow schematics you can see two resistors 15k and 27k that are controlling the gate voltage of the PUT (programmable unijunction transistor) transistor. My question is why we need two ...
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1answer
97 views

What is the use of the diode connected anti parallel to the gate resistance in the general MOSFET/IGBT gate driver circuit?

From my limited knowledge, the only advantage of providing a parallel path through diode with a lower resistance across the main gate resistance is the high speed turn off of the power electronic ...
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1answer
54 views

Electrical Switch for LED’s (Providing enough MOSFET gate voltage)

I am designing a circuit to independently control (ON/OFF) up to 8 LED strips. So 8 independent channels The LEDs are of a single color (Not RGB). LED’s are also rated 12V. The controlling signal is ...
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1answer
146 views

HCPL-3120 gate driver

I am trying to use a gate driver HCPL-3210 for an IGBT but one of the big disadvantages that I can notice is that each chip needs its own power supply of 15 V. So as a total I would need 4 power ...

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