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Questions tagged [mosfet-driver]

A circuit that accepts a small-signal digital input and produces as output a high current appropriate for driving the gate of a power MOSFET. See also [tag:gate-driving].

31
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6answers
10k views

Designing a *linear* MOSFET driver stage

I'm looking for a MOSFET driver circuit that can be placed between an op-amp and a power MOSFET to operate the transistor as a linear amplifier (as opposed to a switch). Background I'm developing an ...
14
votes
4answers
6k views

Driving highly inductive loads destroys mosfet driver

Background I am attempting to generate some relatively high voltages (>200KV) using a system of ignition coils. This question deals with a single stage of this system which we are attempting to make ...
13
votes
2answers
32k views

Bootstrap circuit for high-side MOSFET driver

I am very familiar with the operation of bootstrap drivers on MOSFET driver ICs for switching an N-channel high-side MOSFET. The basic operation is covered exhaustively on this site and others. What ...
12
votes
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 ...
10
votes
2answers
15k views

How to design the gate resistor value?

This is the datasheet of the driver IC I am working on (LM5112). Following is the application diagram of the module. Basically this is the GATE driver circuit for the MOSFET with PDM signal as the ...
10
votes
2answers
8k views

Why doesn't shoot-through occur on totem-pole structure?

I'm designing a totem-pole by BJTs in order to drive a MOSFET. I studied on several online examples and built up my circuit according to what I understood from them. However, there is a detail which ...
10
votes
3answers
679 views

What causes this knee in my MOSFET drain voltage drop?

FINAL UPDATE: Understand a previously mysterious power MOSFET switching waveform wiggle! @Mario uncovered the root cause here below, distinctive to so-called VDMOS devices, typical of many power ...
9
votes
2answers
4k views

Why have my MOSFET drivers blown in this H-Bridge?

I've built a discrete H-Bridge circuit to run a reasonably beefy 12V windscreen wiper motor. The circuit is below (EDIT: see here for a bigger PDF, StackExchange doesn't seem to let you expand the ...
8
votes
1answer
11k views

How do I choose my optocoupler to drive a solenoid with a MOSFET?

I need to drive a solenoid with a MOSFET. The solenoid is an 8W solenoid and it will be connected to a +12V voltage. And this drive command have to be isolated with an optocoupler but I don't know ...
8
votes
1answer
1k views

Proper way of connecting logic GND / power GND on MOSFET driver

I am tring to build half bridge using IR21844 mosfet driver, i have read datasheet and design tips and some of the topics in this forum. The one thing i still cannot get is the separate GND pins ...
8
votes
1answer
315 views

GaN pulsed operation

Does anybody have experience biasing and pulsing a microwave GaN HEMT? I've just ordered a 10 Watt S-band transistor. I know all about bias sequencing. This application is pulsed. I've read about ...
7
votes
4answers
13k views

p-channel MOSFET switch

I want to use a MOSFET as a switch driven by my microcomputer. The original circuit using N-channel MOSFET is on the left side. Honestly, I do not understand the choice of the IRLZ44. The circuit ...
7
votes
6answers
7k views

BJT push-pull for a MOSFET

I'm looking for a way to drive a MOSFET with discrete components. Actually I need to drive a bunch of MOSFETs, with currents of 100-150A. And I'm wondering it would be possible not to use driving ICs, ...
7
votes
4answers
4k views

How to increase mosfet switching speed, and decrease switching losses?

I hope this is not a too broad question, but what are the best practices to achieve fast switching on a MOSFET driven by a PWM signal? My current knowledge tells me I can do two things: 1 - To use ...
5
votes
3answers
5k views

Why do I keep burning my mosfet?

Following this question, I ended up with the following diagram to drive a custom made dc motor using Arduino (omitting the 5V and 12V power supply stages which work properly): I keep burning ...
5
votes
3answers
942 views

Can PWM affect a brushless DC fan given sufficient time?

tl;dr - Is driving brushless DC fans using PWM unhealthy for the fan compared to variable but steady DC voltage? If yes, why and how? The super simple ...
5
votes
4answers
2k views

Does the IR2110 need a gate resistor?

The datasheet of the IR2110 shows this as the typical connection: And in some cases even a gate-source resistor is used, as in this and this post But the app note shows this as the connection for a ...
5
votes
3answers
7k views

MOSFET as Variable Resistor in High Amp Circuit

I'm trying to create a variable wattage heater circuit as shown below. I'm clearly not a trained electrical engineer (simply a hobbyist) so please forgive my crazy idea and general stupidity. You ...
5
votes
1answer
154 views

Mic5158 does not regulate

Refering to this post, I changed mic5156 to mic5158 (datasheet) and this mos. I wired it several times as the datasheet shows but I can't get any regulated voltage. In order to understand what ...
4
votes
1answer
2k views

MOSFET and Driver. Gate current questions

I am designing a three phase bridge inverter and I have some questions about the MOSFET driver. My MOSFET has a total gate charge (Qg) of 200 nC and a internal gate resistance of 2 ohm. I want it to ...
4
votes
1answer
603 views

Why would someone tend to use a high-side device instead of low-side device?

I am trying to understand why someone would want to use a high-side MOSFET to switch on and off a load if they could simply use a low-side MOSFET. Using a low-side MOSFET requires a much lower VG ...
4
votes
1answer
395 views

Driving 3 Mosfets with a MSP430FR4133 from 0% to 100% Duty Cycle

I'm having an issue with a Mosfet driver that I put together. It is a MSP430FR4133 taking in 3 square wave signals and outputting them at a higher frequency. The new signal is put through 3 separate ...
4
votes
1answer
510 views

How to properly drive MOSFET in MPP tracking duty cycle above 50% for a synchronous buck regulator at 50-100V input?

I'm currently building a 10W high voltage (~50V-100V) Maximum Power Point Tracking (MPPT) buck regulator on the side for educational purposes. For the time being, the output is tied to a load. Things ...
4
votes
1answer
580 views

P-Channel MOSFET gate protection

I'm controlling a P-Ch MOSFET on a circuit, VIN is 8-30V TTL_IN is a 0-5V signal generated by a MCU, which can source/sink currents up to 15mA Zener Izt 5mA (BZT52C15) MOSFET Vgs limit 25V I'm ...
3
votes
3answers
1k views

Resistors getting hot in this MOSFET driver circuit

I created this circuit as general purpose MOSFET driver circuit for PWM frequency up to 10KHz (usually from microcontrollers): But R3 and R5 are getting hot soon as I connect 5V supply and I did not ...
3
votes
5answers
1k views

Why MOSFET makes Motor ON directly?

In my project I have to operate DC motor. For this I am using Arduino as controller and MOSFET for switching. I have connected MOSFET GATE pin to Arduino's pin 12. I have used this schematic.... ...
3
votes
4answers
1k views

Best approach for designing 40A laser diode driver?

I need to design 40A 1.8V laser diode driver and need some word of advice as in the past I did from scratch only much smaller DCDCs. As it's a laser diode there will be no fast current changes. My ...
3
votes
4answers
6k views

Understanding purpose of components in a half bridge driver circuit

I'm currently trying to learn and understand about creating an H-Bridge using two half bridge drivers. The half bridge drivers I have are IR2184. I found a circuit diagram someone else has designed ...
3
votes
3answers
528 views

Is “switching frequency” measured for a full cycle or half cycles

Here's a sample datasheet from a FET driver: http://www.ti.com/general/docs/lit/getliterature.tsp?genericPartNumber=ucc27211a&fileType=pdf Section 9.2.2.5 describes calculating power dissipation....
3
votes
3answers
152 views

Gate driver unexpected output

I'm new to this forum and to microelectronics, my apologies if I don't give all relevant information. I'm trying to use a FAN3214TMX low-side MOSFET gate driver (datasheet). Input is provided by a ...
3
votes
2answers
7k views

Floating charge pump for high side N-channel MOSFET bias

This question is derived from this one. I'd like to keep gate on for an indefinite period of time (100% Duty cycle) and for that I'd like to use charge pump since idea with relay is not attractive. ...
3
votes
2answers
1k views

Using MOSFETS for a Level Shifter

I want to use a pair of N and P channel mosfets in a totem pole arragement to shift a VFD display on and off using a 74LS247 decoder/driver. I would put the P channel with the source pin on the top ...
3
votes
2answers
2k views

Buck using discretes - Driving p-MOSFET using n-MOSFET

We are designing a buck using discretes. I have a problem with OFF time of Control MOSFET(U1) and driver(T1). In OFF time, Gate of U1 is rising very slowly to 12V which makes U1 always ON. Which in ...
3
votes
2answers
824 views

Replacement for uknown broken transistor - bipolar or MOSFET?

I try to repair the receiver board of Syma X8 series quadcopter. One of four DC motors is not drived properly, i. e. does not turn on after the signal from transmitters (the other motors do). The ...
3
votes
2answers
243 views

What are the purpose of C38 to C51 in this design?

I came across a BLDC drive circuit design and you can find the design here (https://danstrother.files.wordpress.com/2011/01/danstrother_mtrdrv1_20080629.pdf), and here are the picture of the finished ...
3
votes
1answer
506 views

MOSFET fast turn-off not enough

I have a PWM bridge driving a higher than 1k load from 200V supply. The simplified, equivalent schematic is this: The drivers I'm using are slow turn-on/fast turn-off and, in the schematic, it's a 50%...
3
votes
1answer
212 views

Choosing a suitable power supply for a MOSFET driver chip

I would like to use the TC4427 MOSFET driver chip, in order to switch the current through the IGBT AUIRG4PH50S, which will be placed in series with a resistive load. The power supply providing the ...
3
votes
2answers
720 views

High side regulation of current for proportional valve

I'm working with a circuit which is regulating the current over a generic, proportional solenoid valve (L1 in the schematic below). The characteristics of the valve coil is unknown/will vary and the ...
3
votes
1answer
865 views

How to select a gate driver transformer

I designed a Half-Bridge power supply using Gate Driver Transformers to drive my two MOSFETs. It's working great, I winded the two transformers around very small toroids with some turns, I didn't ...
3
votes
2answers
358 views

What is trimmable “peaking”?

I'm studying Jim Williams application note AN-104 - Load Transient Response Testing for Voltage Regulators, in which he describes an FET-based load transient generator, what might commonly be called ...
3
votes
1answer
248 views

Can I replace a complementary N&P channel MOSFET with two separate MOSFETS?

I'm wondering if a complementary enhancement mode N&P channel MOSFET like this one http://micric.ru/data/documents/P2503NPG.pdf which is used as an inverter driver for the LCD display, could be ...
3
votes
1answer
80 views

What is causing these switching transients on a 3 phase motor driver?

One time I built a 3 phase motor driver, which works quite well in the original configuration. Recently, I changed the physical layout to this rectangular form factor, and now it has quite large ...
3
votes
1answer
304 views

MOSFET driver input resistor

In datasheet for MOSFET driver ZXGD3003E6TA is following typical application circuit: What should be the value of circled resistor? I did not find any reference in documentation. Datasheet link: ...
3
votes
1answer
139 views

Control latching pulse-solenoid-valve with MOSFET Array

I have a setup where I need to control a solenoid-valve via a microcontroller. The solenoid-valve needs a 50ms \$\pm\$6V with around 250mA to OPEN and another 50ms pulse of now inverted \$\mp\$6V to ...
3
votes
3answers
591 views

How to determine whether I need ESD protection? (MOSFET H-Bridge)

I am designing a H-Bridge using IRLZ44N MOSFETs, IR2104 driver ICs and UF5401 diodes. The current circuit looks like this: It will be used on a battery powered device, so no real grounding available,...
3
votes
2answers
4k views

How to reduce noise causing by MOSFET driver?

I am trying to get +/- 12V and +/- 5V voltage in my board. I am getting lot of noise on the primary side itself as well it is carrying to the secondary side. I am driving the MOSFET with 100KHz PWM ...
3
votes
2answers
270 views

P-MOSFET Dropper-Switch - Linear Region

I'm repairing an ECU board from a SCANIA generator. It works with 24Vdc, and on the last maintenance the technician powered it with 220Vac, so it blew up some components. I've managed to replace the ...
2
votes
4answers
2k views

Power MOSFET gets hot while driving Peltier by step-down buck voltage converter

I have a TEC1-12712 Peltier element, which I am driving using Arduino microcontroller through IRFZ44N and buck step down converter (to smooth PWM). Overall, circuit consists of: 12V, 8.5A max DC ...
2
votes
4answers
768 views

How to prevent MOSFET from operating in high resistance part of linear mode?

I'm using several MOSFETs to control various loads, e.g. pumps, lighting, ventilation etc. In the implementation, I have several driver circuits on one board (simple emitter follower, which gives ...
2
votes
2answers
1k views

Optocoupler design

I need to design a MOSFET control circuit which is driven from an FPGA through an optocoupler. Following are the conditions required to be met in my design: When the power is up initially and the ...