Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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25 views

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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69 views

What is the "current - output high, low" referring to on these dual gate drivers?

(Not asking for component suggestions, please don't yank my question) I am looking at two components, (SI8230BD-D-IS and SI82391AD-IS) and think that they both could be used almost interchangeably. ...
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101 views

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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54 views

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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35 views

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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31 views

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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31 views

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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56 views

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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64 views

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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50 views

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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69 views

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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112 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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211 views

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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87 views

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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44 views

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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95 views

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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1answer
56 views

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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45 views

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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2answers
88 views

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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1answer
56 views

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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2answers
61 views

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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107 views

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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1answer
72 views

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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46 views

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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55 views

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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1answer
132 views

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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1answer
107 views

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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1answer
67 views

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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1answer
83 views

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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81 views

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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1answer
36 views

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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14 views

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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108 views

PMOSFET driver not pulling gate voltage up to supply

I just started learning about MOSFETs and gate drivers and the like. I wanted to make an H-bridge operating at 320kHz that can later be modified through the use of faster FETs to get up to ~10MHz. I ...
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73 views

Using tc4420 as buffer for IR2110 driver

Hey there,i want to keep this simple. Recently ive been working on a half bridge tesla coil project.i have succesfully made circuits using the ir2110 gate driver itself but the reason why i come up ...
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101 views

How can I extend the pulse length of a gate drive transformer?

I'm designing a coilgun stage that uses a pulse transformer to switch a high side N channel mosfet. The issue I'm having is that I can't get the firing pulse through the transformer to last longer ...
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1answer
80 views

Gate Driver Circuit Question

I read the PoE PD Schematic Review Guidelines, and there is a gate driver circuit I don't understand how that works. Can someone tell me how to work? 1.) On the page 22, the dotted boxes are the gate ...
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3answers
426 views

Gate driver burning and snubber design for half-bridge transformer driver

IR2113 floating channel digital-input half-bridge transformer driver Dead time is properly set Channel supply VPP 20-60 V, gate bias supply 15 V Operation frequency 15-100 kHz, operation mode PWM or ...
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3answers
278 views

Reducing quiescent current of MOSFET pullup/pulldown

I have a device which will run off a 2.7-60V power source. The voltage may go up to 80V during surges. I have a couple of input protection circuits which use N or P channel MOSFETs and require pullups ...
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81 views

Response of mosfet in high frequency

I used two mosfets to control current passing through resistance 5ohm, shown in the circuit of the attached file. The simulation results show that the mosfet switching frequency higher than 10KHz ...
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1answer
79 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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1answer
77 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
78 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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195 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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119 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
148 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
75 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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49 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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1answer
103 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
181 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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2answers
51 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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