Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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12 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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32 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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26 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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168 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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48 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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36 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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28 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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24 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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51 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
51 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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32 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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27 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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159 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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44 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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116 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
57 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
102 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
63 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
49 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
62 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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82 views

Isolated MOSFET gate driver VCC and VDD power suppl

I am planning to use UCC21520 for HV SiC MOSFET based full bridge design. My operation frequency would be around 100kHz. I selected UCC21520 in order to achieve the isolation between the power and ...
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60 views

Parameters for VAC 5046-X005 gate pulse transformer

I'm trying to parameterize this device to find a suitable equivalent. Trouble is, there seems to be no datasheet available, and one of the two secondaries are measuring open, so complete measurements ...
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52 views

component identification by the image

I was troubleshooting a transformer coupled MOSFET gate driver circuit. I found the sot-23 package component having the part details in photo which I was not able ...
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1answer
92 views

Is it possible to reduce the Miller's plateau voltage?

Consider the following circuit: Image source: Simplified Clamped Inductive Switching Model - Figure 3 from "Fundamentals of MOSFET and IGBT Gate Drive Circuits by Texas Instruments" I would like to ...
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68 views

Gate Driver HCPL3120

I want to use HCPL3120 gate driver: Its data sheet is here: https://www.mouser.com/datasheet/2/678/V02-0161EN_DS_HCPL-3120_2016-03-21-908803.pdf On page number 22 there is an excellent design for ...
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104 views

Connecting a low-side gate driver to a FET with current sense resistor

When connecting a low-side FET gate-driver to a FET (N-channel MOSFET) that has a current sense resistor connected between its source and ground, where should I connect the ground of the gate driver? ...
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41 views

Can someone explain this high-speed P-channel MOSFET drive circuitry?

I found this circuit in an application note on P-Channel Power MOSFETS. The note explains that modern technology has made it possible for P-Channel MOSFETS to approach N-Channel performance in power ...
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1answer
77 views

Charge Pump for P-Channel MOSFET

Many N-Channel MOSFET drivers for high side switches and high speeds have charge pumps that can provide enough current at high voltage to drive the gate high and sink the current back out again. I ...
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65 views

Si8234 PWM with “disable” pin

in the datasheet of the Si823x family of gate drivers, the Si8234 is mentioned as being a high-side/low-side driver with PWM input, but actually this "PWM" input pin is only there for switching ...
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31 views

Why do we require isolated supplies for gate drivers in 3-phase inveters?

I have used isolated supplies while making optocouplers based drive circuitry for driving 6 IGBT switches in 3-phase VSI in my undergrad projects. I remember my professor kind of explained why exactly ...
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63 views

Calculating resistance for integrated circuit with logical gates, so that the circuit works properly

I have found this task with its solution: For the circuit shown below calculate \$R\$ so that the circuit works properly. All gates belong to the \$TTL\$ series. Solution: $$\begin{align*}R_{max} &...
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1answer
119 views

mosfet gate charge

Because I was worried about the gate inrush current of a p-mosfet, because of a lacking gate-resistor, I decided to measure the switching times with an oscilloscope. I also considered another ...
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29 views

High Side - Low Side Driver selection

I'm currently using a pair of IPT015N10N5 FETs in half bridge configuration, to drive a motor. The FET gates are driven by a UCC27211A-Q1 High Side/Low Side driver. I'm thinking that this particular ...
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44 views

How to generate time delay when input frequency is high?

Im trying to generate time delay for my gate drivers for a project im working on. But the issue is at lower frequencies my circuit works fine, as I ramp up the frequency (upto 250Khz) the output goes ...
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39 views

N-MOSFET not passing current when gate is high (SPICE)

I'm having a very strange issue with some power MOSFET circuits I'm trying to build for regulated high-current pulses. I can get my circuit to work fine when I use a lower-amperage power MOSFET, but ...
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1answer
119 views

H-Bridge Gates Stuck On

I've developed an automotive H-Bridge circuit using the DRV8702-Q1. It's pretty close to the reference schematic in the datasheet but it doesn't work. I've been racking my brain for ideas as to what ...
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158 views

driving mosfet gate with an npn bjt

simulate this circuit – Schematic created using CircuitLab Today I saw an led dimmer product. the driving circuit was like in the schematic. it was a cheap one but the circuit looks inefficient ...
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1answer
117 views

Is isolation required for MOSfet gate driver's and microprocessor's power supply?

I have designed a 62W , 24V-5V buck converter operating at 250KHz. I am using TI's UCC27200A gate driver and Infineon's Optimos 4. The problem is that the driver doesn't have any kind of isolation ...
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4answers
176 views

Math behind Zener resistor for MOSFET Vgs

The following circuit is from Texas Instruments: http://www.ti.com/lit/df/tidrb35a/tidrb35a.pdf What is the math behind the string of six 470k resistors at the MOSFET gate? I know that they are for ...
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131 views

H bridge circuit using FAN7392

YELLOW- LOW IN RED - HI IN BLUE - LOW SIDE OUTPUT GREEN - HIGH SIDE OUTPUT I have designed a H bridge circuit using FAN7392 & 25N120NDH IGBT. The voltage I want to switch for now is 24 volt ...
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64 views

Measurement of Quiescent Current and Operating Current in Gate driver

In datasheet they have provided two parameters named Quiescent Current and Operating current in which I am measuring quiescent current i.e, ground current flowing from the device VDD to GND , when ...
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3answers
275 views

IGBT Gate driver sink or source current

I will drive a load low side with IGBT. IGBT gate-emiter (Threshold) voltage will be 12 V. This voltage level is enough for my load current. I will use a gate driver. When ı search gate driver for ...
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61 views

pwm half bridge inverter- split capacitor voltage alternating

In the half bridge inverter shown below, when driven by a PWM signal, the voltage Va (the voltage in-between the two capacitors C1 and C3) is a sine wave. I was expecting it to be a constant voltage ...
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42 views

High/ Low level output voltage in gate driver datasheet

Gate driver datasheet mentions about VOLL and VOH with test conditions Iol=100mA I am testing this using this setup by calculating value (ron of pmos is 7.05 ohms) of load to be placed, Is this ...
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86 views

Propagation delay and its measurement in datasheet

I am referring to Gate driver LM5102 Here the terms are bit misleading 1] Lower turn off propagation delay 2] Turn on delay But application curves uses different measurements symbols(tp/tdl)/...
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3answers
2k views

Why have both: BJT and FET transistors on IC output?

This is the structure of FAN3100 gate driver IC: (taken from its datasheet) As you can see - there are two ouput switches: CMOS and BJT. Why they put them both?
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1answer
131 views

Half Bridge with PWM- gate signal problem

After making a half bridge inverter using a square wave (I asked a question on this website about it previously) I have now decided to use PWM signal in order to obtain a sine wave output and have ...

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