Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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2
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1answer
386 views

Isolated Gate Driver Consistent Failure

I have a Tesla coil driver, designed around a UCC21520 isolated gate driver. It is operating as a fixed 50% duty cycle half bridge switcher. The frequency is varied from 150kHz to 250kHz. It is ...
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1answer
221 views

High speed PWM sometimes glitches out my gate driver

I have a Sparkfun Arduino Pro Micro (an ATMega32u4 breakout board), feeding two PWM signals to a custom board I made based around a mic4606 (dual half-bridge gate driver IC) The IC is driving 4 ...
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1answer
199 views

Is the optocoupler placed before or after the gate driver? [closed]

Is it MCU - OPTOCOUPLER - GATE DRIVER - MOSFET or MCU - GATE DRIVER - OPTOCOUPLER and why? EDIT : it cannot provide enough power so it is used for signals therefore option 1.
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2answers
156 views

Dual gate driver inputs/outputs tied together

I'm using an IR4427 dual low-side gate driver to drive a single IXEL40N400 IGBT. Since I'm not using the second side, I'm considering tying its input to the active input and output to the active ...
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2answers
226 views

**VGS** of upper MOSFET disappears after turning on supply voltage [closed]

Why does VGS of upper MOSFET in either leg of full bridge drop when the supple voltage across the drain terminals of the upper MOSFETS gets turned on ? The half bridges separately work perfectly fine ...
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1answer
548 views

Gate driver IR2110 doesn't work - Full bridge [closed]

I am using two gate drivers (IR2110), each driving a phase leg of the full bridge. Everything has been wired up according to the datasheet http://www.infineon.com/dgdl/ir2110.pdf?fileId=...
1
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1answer
978 views

How to match gate driver with Power MOSFET?

I have a HB power MOSFET , and I need to check if the driver that I choose drive the Half Bridge MOSFET by a good way Here the schematic and Specification of the driver and MOSFET ...
1
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1answer
671 views

Mosfet does not turn off

Well, I have this circuit design that drives a motor (draws abt 3A) via N channel mosfet. It works fine on a breadboard. I decided to go with pcb and ordered some from oshpark. Suprisingly once the ...
2
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2answers
259 views

LDO to regulate bootstrap voltage

I am designing a BUCK converter 24V/12V, 80A, 300kHz switching freq. It will be used for stepping down battery voltage, so it can be expected for input voltage to vary from 22 to 30 volts. I am ...
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3answers
422 views

Resistor values for a Voltage- Controlled Current Source Circuit

simulate this circuit – Schematic created using CircuitLab Hi Folks, During my bachelor thesis, I am learning IGBT gate driver cricuits. I am struggling with understanding the following ...
0
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1answer
223 views

How do I interpret BST/SW voltage rating vs BST/GND rating in data sheet?

I'm reading the datasheet for the NCP81151B-D MOSFET gate driver / half bridge. It has a standard bootstrap configuration where the switched note (drain + source of the totem pole N-FETs) is tied ...
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1answer
883 views

Voltage surge during transition of high side mosfet in half bridge mosfet gate controller

I'm working on half bridge mosfet gate driver using IR2184 and IRF540N mosfets. You can find circuit diagram and scope captures in images. I have observed that there is a small spike (LC tank like ...
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0answers
1k views

Drive strength definition & fanout

Given an inverter of drive strength N (example N=16) and input capacitance 1.6fF, does it mean that it can drive N times its gate capacitance, i.e. 16*1.6f=25.6 fF, or N times the unit capacitance, ...
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2answers
464 views

Can I drive MOSFET gate with an isolated voltage source?

I have two N-channel MOSFETs. I want to make a simple bidirectional solid state relay by using them. I want to place them back to back as seen in the schematic below, and drive them with a controlled ...
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0answers
638 views

High- and low-side MOSFET gate driver bootstrap circuit

I am trying to create a simple buck converter on a breadboard using this topology: I am familiar with the theory of this circuit and believe I have connected everything correctly. The gate driver I ...
1
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2answers
506 views

How do I delay MOSFET turn on without slowing down the rise time?

In a Half bridge MOSFET switching circuit, in order to prevent a "short" circuit through the high and low sides, I need to delay the turn on of the high/Low side until the Low/High side has turned off....
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2answers
1k views

High Frequency High-Side MOSFET Drive

For ultrasound transducers for imaging, high voltage drive pulses need to be generated, typically using a 3-level or 5-level pulser structure which resembles the image below. For a 3-level structure, ...
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2answers
2k views

Choose Vcc for MOSFET driving a 48v Motor

The circuit above is used to drive a 48v motor as shown. I am using: IRF3205 MOSFETs (datasheet) IR2110 High and Low side driver (datasheet) 22uF bootstrap capacitor for PWM frequency of 30 KHz. I ...
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1answer
111 views

LED strips using not gate [closed]

I have 2 led strips and I want to turn one ON when the other turns OFF. I have a 50V transistor from a atx psu, and a switch. When I assembled, the circuit works (not gate), but the strip that should ...
3
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1answer
2k views

Purpose of anti-parallel diodes in isolated gate driving circuit?

I've come across this high voltage 'modulator' circuit and the MOSFET gate drive circuit is shown below. The floating wire on the bottom connects to a duplicate of this circuit at the MOSFET drain (...
0
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1answer
257 views

PWM inductor current

I am trying to understand this. When a induction motor is driven PWM Drives, the current is not chopped-up but filtered into nice sinosoidal wave because of inductive nature of motor. I understand in ...
0
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1answer
306 views

Using AND gate as a comparator

I amb trying to desing a very simple Gate Driver for a Class-D audio amplifier. In order to introduce the Dead Time my first thought was to use a RC conected to a comparator as an imput of an AND gate....
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2answers
1k views

Pulse transformers and V.dt ratings

I am experimenting with a mains 230Vac chopper using IGBTs and needed an isolated gate drive circuit. Much searching and head-scratching led me finally to a pulse transformer design as a simple, ...
3
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1answer
645 views

Half Bridge Gate Drive Transformer - Extra winding?

I've been experimenting on a lot of half-bridge-based PC PSU schematics. There's one thing I cannot understand: As can be seen from above, there's an extra winding in series with the high side ...
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1answer
357 views

How to create high voltage levels for high side input of a driver?

I need to charge and discharge a capacitor up to supply Voltage and down to GND level. Supply voltage of the system may change between 120V and 60V. Also, to drive capacitor charge/discharge switch, I ...
0
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1answer
252 views

L6491 half bridge gatedriver is destroyed regularly

I'm trying to build a power supply - combined step-down converter and the inverter using only a single H bridge and power LC member (C91, C92 = 2 pieces of 1.5uF foil capacitor in paralel and coil 1,...
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0answers
192 views

Using 1:1 Transformer for High Side Switching

I'm working on a 2-sw Forward Converter with isolated input and output. The design is complete on paper, but I still have a problem in my head: High side switching. The question is, can I drive the ...
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2answers
221 views

Mosfet driver(Pin configuration)

I would like to know what Vcc(supply voltage) and Vin(input voltage) do on Gate driver. Here is the datasheet. http://www.ti.com/lit/ds/symlink/tps2813.pdf
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2answers
106 views

Gate driver and instability problem

This is a gate driver circuit for a boost converter. However, there is one part that I don't understand. Could you explain it or give me some links so I can read up about that? Here is the part that ...
0
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1answer
74 views

analog shut down whilst turning on an LED

I am a EE student from Denmark, in the middle of making a class D audio amplifier. In this matter, I have stumpled across a needed circuitry. I need a way to shut off my gate driver (essentially the ...
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1answer
2k views

MC34063 P-MOSFET driver?

I've got a successful buck converter design using an LM3485. It's got a MOSFET gate driver output pin that swings between Vin and Vin-5V - perfect. My MOSFET is a SQ1431EH-T1-GE3. It has a maximum Vgs ...
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0answers
161 views

Parallel high speed and high current mosfets

In order to speed up switching times and reduce power (I2R) losses, is it worthwhile to put a fast switching (but high RDSon) FET in parallel with a low RDSon (but slow witching and high Qgs) FET? ...
2
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1answer
143 views

Why does a triac trigger with gate current in either direction?

I've been coming up to speed on thyristors, and triacs in particular. I've found detailed material on them a little hard to find, in particular on the device physics. Horowitz & Hill is silent on ...
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1answer
324 views

Triac Datasheet/Design Questions

1) How do I choose the resistor for a triac? I saw this design in the opto-isolator datasheet that I'm using. I thought I'll just change the resistor value based on the gate characteristics of my ...
0
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1answer
264 views

Boost capacitor sizing, gate driver LM5106 used with N-MOSFET IPP075N15N3 G

I am using a TI gate driver LM5106 and I wanted to size the bootstrap capacitor. The application regards a synchronous boost converter. According to pag. 13 I need the \$Qgs\$ charge of the MOSFET ...
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2answers
1k views

Why does this circuit speedup the switching time and reduce losses?

I am a little confused as to how this circuit works: According to this website its function is to speedup charge time of the MOSFET as well as reduce losses. How does D1 and Q2 actually work to make ...
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3answers
786 views

Hysteresis in a MOSFET's I-V

I've skimmed through several sparse articles online about hysteresis in a MOSFET's I-V characteristics. What I found was sparse, but some articles attribute uneven-ness in the gate structure, causing ...
12
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2answers
3k views

What is the difference between driving a MOSFET gate and an IGBT gate?

Can I use an suitable IGBT gate driver for driving the MOSFET, and vice versa? Which parameters (threshold, plateau, and turn on voltage ratings, gate capacitance, etc) must be the same for this ...
2
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1answer
151 views

Gate Driver Voltage drifting?

I am using below circuit to differentially drive ultrasonic transducer. It works almost as expected. However, I notice strange phenomenon if i observe the output at the transducer with dual gate ...
0
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1answer
1k views

Boosting output current of mosfet Driver IC

Continuing my work on a half bridge driver . I faced problem of slow Turn on/off of the mosfet due to the "relatively" low output current of the IR21844 mosfet driver (1.4A source and 1.8A sink). ...
2
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3answers
1k views

Boost converter for high side Mosfet

I recently came across an article explaining how to drive a high side MOSFET using a "separate isolated power supply whose ground and the ground of the MOSFET-based circuit are isolated". However ...
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2answers
1k views

Why do MOSFET drivers need so much current?

I'm using a MOSFET driver to drive a 6 MOSFET H-bridge, with a 40V supply. At 25 KHz, the driver gets very hot, almost too hot to touch. The MOSFETs have a gate charge of 350 nC. Why does it take so ...
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1answer
206 views

Practical Bootstrapping

I have been looking up bootstrapping circuits. The concept makes sense, but I am afraid I just don't see the use. Can someone give a practical situation where one would be designing and decide this is ...
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1answer
623 views

How to PWM-drive a N-channel non-logic level power MOSFET with a 3.3V signal?

Follow-up of Using IR21531 as a simple 1 channel gate driver After doing the above question (I'm very sorry, beacuse my question seems a XY one), I'll try to explain better what I believe that I want ...
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1answer
217 views

Using IR21531 as a simple 1 channel gate driver

I've bought the only gate driver I've found on the local hardware store (IR21531). I want to use it only to drive a IRF630 with a PWM 3.3V signal. How should I do the wiring? As you can see on the ...
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1answer
318 views

How to detirmine if I need a gate driver for MOSFET or not?

I want to design a BLDC motor controller and I am still collecting some info about the components that I will use, of course main components will be MCU and MOSFETs. I have seen some designs that use ...
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0answers
1k views

MOSFET Without Gate Resistor is Failing

I have two MOSFET circuits; one is working and the other fails and I'm not sure why. I just want to turn on/off the LED, nothing special, no fast switching. Below is the working circuit (series gate ...
2
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2answers
341 views

Gate Driver IC question?

Refer to this Question: MOSFET Gate Driver Simulation Problem My Gate Driver datasheet: http://www.irf.com/product-info/datasheets/data/ir2104.pdf May I ask why there are two capacitors instead of ...
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2answers
873 views

High side Driver Issues

I am currently developing a small low power (high switching) Buck converter and have run into a strange issue that I have never seen before and was looking for some insight into the issue. I am also ...
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2answers
3k views

Buck Converter with Gate Driver

I designed a simple buck converter to meet the following specs (I have attached the schematic): Vin = 17.4V Vout = 12V D = 0.69 Switching Frequency = 50kHz Inductor Ripple Current = 20% of ...