Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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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 ...
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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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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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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-...
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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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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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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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How is output current of a MOSFET gate driver controlled?

So I have been studying a lot about gate drivers, and I understand calculation of the current requirement, but what I don't understand is how the output current of the driver IC regulated. In ...
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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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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 ...
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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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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 ...
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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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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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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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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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When should you use a gate driver, and how do you choose one?

I'm building an amp using the NXP MRF300AN 300W LDMOS RF power amplifier device and was originally planning to use a DAC to drive the gate bias until @Hearth mentioned that I should use a gate driver. ...
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Two switch forward converter - replacing BJTs for IGBTs in welder

So my friend has a broken TIG welder, an Lorch IT 250 GW to be specific. It's quite old, water cooled, has 250A continuous welding current and is powered by 3x230V mains. It was sitting for about a ...
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Dual input gate driver with discrete components

How do I discharge C3 (simulated gate capacitance) after/on the V2 pulse trailing edge with discrete components (capacitors, resistor, transistors, diodes, etc.) and no additional power sources? V1, ...
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Troubleshooting Skyper 32Pro R + Adapter Board 1 Skyper 32Pro R

Hello I am trying to test an IGBT SKM145GB066D with the Adapter Board 1 Skyper 32Pro R and gate driver Skyper 32 Pro R, but cannot make it work. I've spend 2 weeks trying, but it seems like some ...
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Series IGBT connection problem that the second igbt is always on

I'm tring to make fast turn-on circuit, so I use boosting P/S with 19V. And main P/S is 2V with 5A. The circuit is as follows. IGBT is connected by series, and gate-emitter voltages apply square ...
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FET Gate Voltage Question

What gate voltage is required to turn on a power MOSFET to the specified Rds(on) at a given drain current? Take for example, 1.5A drain current using this FET. https://www.vishay.com/docs/78092/...
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Question regarding the MOSFET gate Miller plateau region

During turn of on an N-MOSFET, the gate drive dynamic characteristics curve looks like this: The gate voltage across the gate terminal of MOSFET rises linearly for charging input capacitance Ciss ...
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In buck converter what will be the MOSFET source node voltage (floating point) with respective MOSFET gate for driving the N-MOSFET turn ON

To turn on N-MOSFET (high side) what should be the gate voltage (Vgs) in buck converter before turn on and after turn-on of MOSFET. Case 1 (As per my understanding): To turn on the MOSFET the gate ...
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Make 3 phase motorcycle stator as engine starter

I've been studying this for more than a year. I want to make a BLDC controller to start a motorcycle engine, where the power source from a 12 V battery is input into the BLDC driver and then input to ...
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122 views

Is it a good practice to take power for gate driver from MOSFET source?

I would like to avoid using DC-DC converters for each power MOSFET in a switch-mode power supply as they are pricey, bulky, and have an input to output capacitance which can lead to common-mode noise ...
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Gate resistor with "logic level" MOSFETs

I need to drive 2 logic level MOSFETs from digital outputs of a microcontroller (3.3V). These will be used to drive a low-power push-pull converter at 500 kHz. I have identified these "double&...
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2 answers
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DC motor flyback diode get very hot (then roasted) [duplicate]

My motor works with 5V and consume about between 6 A and 8 A , controlled by ESC with PWM , and there is 1n4007 flyback diode to protect it , when i am working with PWM frequency = 350 Hz ( it works ...
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ESC (flyback diode)

i bulid ESC circuit based on TLP250 gate driver and IRF3205 MOSFET ,My motor works with 5V and consume about between 6 A and 8 A. the ESC circuit works well over month with software PWM frequency = ...
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How to use a MOSFET to switch up to its Vds rated specs (e.g. 100 or 150 V)?

So I'm still learning (old dusty ETE degree I finally got around to making use of lately), so be nice please. I get a ton of snark sometimes when I post a question on here. But then there's always one ...
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MOSFET gate capacitance near \$V_{gs,th}\$ (miller plateau)?

I have trouble inferring a realistic value of the gate capacitance for when a MOSFET is used near its turn-on voltage, i.e. not as a switch but as a linear regulator. It's important to find a ...
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GDT Core Selection for an MF Switching Action

I am designing an MF (approx. 1.5 MHz) MOSFET driver for an inverter circuit. I’d searched numerous driving strategies (according to the circuit’s needs like high frequency operation, drive-input ...
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2 answers
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Gating a 5 V signal on <microsecond scale with a small gate signal, should I use a MOSFET?

I have a 20 Hz (~25 µs long) 5 V square-pulse that I would like to block most of the time, and only let through when another channel is above some 100 mV level. I wonder what would be suitable ...
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Boostrap capacitor charge path

I want to make a bootstrapped high side switch, something like this: (source SLUA618A, interesting for many things, by the way) The negative voltage transient label is not pertinent to the question, ...
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How to make considerations when connecting MCU to IGBT which has Logic Level Gate Drive?

I will use MCU that has 5V output that should connect to ISL9V5036S3ST IGBT. IGBT will drive ignition coil that has 0.8 Ohm resistance connected to 12V (+/- 3V) power supply. IGBT will be on the low ...
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Circuit to drive 8 IGBT gate drivers using 2 PWM pins on Arduino

I am using digital pins 9 and 10 to generate a 10kHz PWM on Arduino Uno. So, I got 2 PWMs. But I need to drive 8 IGBT gate drivers using these 2 PWMs (4 IGBTs using PWM1 and other 4 IGBTs using PWM2). ...
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4 votes
1 answer
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What is high-side bias in a MOSFET gate driver IC and why is it needed?

I'm using the IR2104 gate driver in a DC motor driver design, and I noticed something in functional block diagram from the datasheet that I didn't understand. The low side schematic is as expected, ...
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-1 votes
1 answer
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Why is the pulse generator negative pin connected to the source pin of a SiC MOSFET?

The image attached below is the LTspice schematic of a buck converter. Here, the pulse generator ground terminal is connected to the source terminal of SiC MOSFET. I don't know why this is connected ...
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Driving the Gate of an AC MOSFET Switch

I'm designing a bidirectional AC power switch using two source-to-source connected n-channel MOSFETs. Some restrictions apply to the design: I want to use only standard components The load must be ...
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Low voltage MOSFET gate drive

What is the best way to drive a MOSFET with low voltage? I have encountered several projects where power from a battery is used to drive motors or source a DC/DC converter. In most cases, we used an ...
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Limiting the base current to BJTs in Gate Driver circuits

I want to make an MCU operated buck converter with the lowest operating current possible since most electronic shops near me only offered buck converters with an operating current of 10 mA and above. ...
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Reproducing ST Design Gate Driver

I try to reproduce the buck-boost converter from the "STM32F334 Discovery" board. Therefore I have drawn a KiCad Schematic and assigned the appropriate spice models. But unfortunately, I'm ...
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Should I be using two half bridge drivers, or can I use two single MOSFET gate drivers?

I am in the middle of doing some research on gate driver ICs and I'm wondering why it is more common for people to use two half bridge driver as apposed to using two gate driver ICs. Here is the more ...
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To minimize the power loss in MOSFET of current control circuit

I am going to measure the electrical response (voltage drop vs current) of an electrical contact joint modeled as resistance 0.4 ohm in following figure. I made a prototype circuit to control the ...
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2 votes
1 answer
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Balancing the short trace requirement with the thermal ones

I'm designing a substantial (200W) buck converter with the LT3840 (datasheet) controller (but the question is not really part specific). As usual with these parts the datasheet says: Minimize the ...
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IRS2007S LIN input problem

I'm using IRS2007STRPBF gate driver. I set up almost the same circuit suggested in the datasheet. I am attaching the circuit. I'm connecting my 3.3V microcontroller outputs to the HIN and LIN inputs ...
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