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].

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10
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2answers
18k 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 ...
33
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6answers
11k 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
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2answers
33k 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 ...
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3answers
2k views

what the best way to calculate Rg gate driver for Mosfet

I need to drive a MOSFET IPW90R120C3 from Infineon here the Specification of MOSFET VDS @ TJ=25°C 900 V Rdson @ TJ=25°C : 0.12ohm Qg = 270nC Specification of ...
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1answer
217 views

How many MOSFETs can a linear controller handle?

I designed a circuit for a high current linear regulator (20A peak, 16.4V (max) input regulated to 13.8V) using a Micrel MIC5158 together with a BUK9575-55A. The 20 A peaks are short, since the use is ...
8
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1answer
2k 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 ...
1
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3answers
908 views

IR2110 max duty cycle

I'm using the high side of an IR2110 driver. If I set the duty cycle to 100% the circuit burns out, I haven't how can I calculate the max duty cycle for the driver in a given circuit?
0
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1answer
244 views

H-bridge MOSFET NAND gate driver suffered from logic voltage drop

I've tried to reproduce the NAND Schmitt triggers circuit to drive my H-bridge MOSFET as per following source: http://axotron.se/index_en.php?page=34&chapter=0 All my design files are at this ...
8
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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 ...
7
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4answers
16k 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 ...
0
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1answer
889 views

How to generate a bipolar waveform using MOSFET?

I'm trying to generate bipolar waveform using MOSFET (IRF9630 & IRF630): Basically the bipolar waveform looks like below: The load is a wounded coil (260 Ohm). For the experiment I need this ...
7
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4answers
5k 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 ...
2
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2answers
6k views

MOSFET switch using an optocoupler

With the parts in the mail, haven't had the time to test, but the simple question: will this work, or what improvements are needed? What it's supposed to do: a MOSFET switch for 12V, 0.5-3A loads, ...
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3answers
1k 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 ...
2
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3answers
222 views

Mystery issue driving load through NFET with microcontroller

U1 is a microcontroller driving M1 to drive a load. I am running into some bizarre behavior and I'll try to include all the relevant information. Hope it's not too much. M1 is a logic-level FET. ...
1
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2answers
234 views

Fan PWM driver - design question

I've been working on crating a simple PWM fan driver for my Raspberry Pi. To simply explain idea - I get 3 pin input (1 - PWM, 2 - 5V, 3 - GND), then using RC filter I turn PWM signal into voltage and ...
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1answer
1k views

Why is my gate driver simulations are taking very long?

I want to turn on and turn off two mosfets from the asymmetric H bridge which is connected to SR motor at the same time. I'm using IR2183 gate driver. The circuit connections from LTspice are show in ...
0
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1answer
331 views

How can I turn a clock signal into a logic high that also goes low when the clock drops out?

I have a differential clock signal coming from an IC. If the signal is present, I need a TTL "high" to enable a high-side FET driver. When certain conditions are violated, the IC will send the ...
0
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2answers
362 views

MC34063 with external FET. Why?

Follow on from : earlier post Below is an LTSpice simulation of an MC34063 step up (5v to 9v) circuit. As you can see, this particular circuit is working correctly, and delivering about 300mA. The N-...
2
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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
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2answers
2k views

Is it safe to “top up” bootstrap capacitors using a charge pump?

This document from TI describes a method to allow use of bootstrapped N-Channel MOSFETS at high duty-cycles, by keeping the bootstrap capacitor "topped up" with an external charge pump, separate from ...
2
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2answers
441 views

Help with BJT-based driver for MOSFET

Im trying to drive mosfet's gate with couple of BJTs: S9014 (npn) and S9015 (pnp). They are in half bridge, VCC is 12V. Here is schematic: Input is PWM with frequency of ~70KHz from STM32 micro. I ...
2
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2answers
222 views

Questions about sensing pulse current and driving a logic MOSFET in a circuit

This question is about a personal project and related to my previous question but focusing on different issues or questions. By increasing the shunt resistor from 1 mOhm to 330 mOhm I wanted to avoid ...
2
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3answers
2k views

Mosfet type to drive a 100A DC motor using pwm

I have a bunch of custom made DC motors. They are supposed to work in a range between 80Vdc and 120Vdc. Nominal power is around 800-1000W (they're custom made for a custom application, so specs are ...
1
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1answer
379 views

Why are MOSFETs switching at a different speed than the one they are being driven at?

I used a 555 oscillator to drive a MOSFET array for my entry-level tesla coil setup. When I measure the frequency at the driver output (Location #2) everything seems normal. When I measure it at the ...
1
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1answer
569 views

Problem with PWM motor driver

I'm using my custom circuit in the figure for driving dc motors. I'm providing a PWM (25khz). While trying the activation threshold (minimum duty cycle that activates my motor) experimentally I have ...
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0answers
49 views

CircuitLab simulation of 555 timer - OUT HIGH always delivering 5V irrespective of Vcc?

I've scratched together a design for a 555 timer based driver for an IR540 MOSFET. But in CircuitLab the simulator shows the 555's OUT voltage is always 5V when high, for Vcc ranges 3.3V through 24V. ...
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2answers
1k views

Drive relay with IRFZ44N

The output from an existing circuit gives me 2.5V and .15mA I have setup the following circuit and it seems I cannot drive the relay. May I know why it is so?
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2answers
4k views

IR2110 getting really hot in this high-side gate driver configuration

I've constructed the following circuit: From this blog: Tahmid's Blog I put an LED in series with a 330 ohm resistor at the OUT terminal. I have the 5 V being supplied by an Arduino and the 12 V ...
1
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2answers
3k views

IR2110 LTspice simulation weird behaviour

I am obtaining weird voltage behaviour at the gate of my high side mosfet controlled by IR2110 which is controlled by PWM. PWM configuration: Vinitial = 0 Von = 5v Tdelay = 0 Trise = 7u Tfall = 7u ...
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2answers
2k views

Power N-Channel Mosfet as a Switch

I just want to use a BJT transistor to act as a interface between a microcontroller and a MOSFET. I need to turn on and off an N-Channel MOSFET for controlling a much higher current on high voltage. A ...
0
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1answer
3k views

MOSFET Gate Driver Simulation Problem

I am trying to simulate high side MOSFET in Proteus using gate driver IC IR2112 but it does not work as expected when HIN is high. The mosfet should be turned ON when gate voltage is more than 10V but ...
0
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0answers
68 views

High voltage switching using N-FET

This is my first time designing a High voltage switch, as come up with some interesting thing that I want to ask about. My application needs to short out a signal line to HIGH, with a 3v3 signal from ...
0
votes
1answer
864 views

Using a Mosfet Gate driver to directly drive a small stepper motor?

I need to control some small, low current stepper motors from a 3V ARM micro controller. The motors typically require 5-12V at 400mA (30 ohm 41mH windings). What occurred to me is to use a Mosfet ...
0
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1answer
670 views

H-Bridge MOSFETS getting hot with no load

I have the following circuit: The circuit is working fine, but the problem is that when there is no load, the IRF9540 are getting hot. When they are in load, they are cold. For sure, I think it's a ...
0
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2answers
523 views

High-side switch for 24V controlled by logic level

I mainly use this high-side switch design for 5V and with low current loads (under 100mA). Based on the VDSS (-50V), I thought I could energize this design with 24V as well. Apparently, I am making a ...
0
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1answer
274 views

Does the IR2110 provides isolation?

The datasheet for the IR2110 shows this diagram: Where vss is the digital ground. Does this mean that the ...
0
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1answer
809 views

Driving IRF540N with darlington

I'm trying to drive MOSFETs with 3.3V PWM signal. Here is a (probably bad) circuit: I know that a darlington is not the best thing to drive a mosfet with. But actually I need to drive many of them ...
0
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1answer
346 views

BLDC Current Driver Encountering Current Problems

The attached Schematic uses 6 N Channel Power Mosfets "IRL3303". I have wound my inrunner bldc motor with 180 windings per phase using a 26 Gauge Magnetic Wire. My motor is a 6 pole 2 magnets machine. ...
0
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2answers
740 views

Minimal power circuit for recupating three phase motor drive on DC

A thee phase motor (like an asynchronous motor or an brushless DC motor) can be driven from DC power by using a half bridge on every of the three phases (for example by six FETs) if I'm right. What ...
0
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2answers
1k views

How to drive power MOSFET by logic level signal without inverting phase?

I struggle yet another day with very simple problem (circuit). This challenge seems to be very common, but nowhere I can find a complete solution: I have a heavy load (12v / 1 Ohm peltier = 12A max) ...
0
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2answers
122 views

VReg with MIC5156, why a so high drop-out voltage?

I'm building a voltage regulator with a mic5156 (datasheet). I wired it as this (coming from the datasheet Figure 1C ): With this design, I need to input more than 8 volts in order to get the expect ...