Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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6
votes
3answers
18k views

Bootstrap circuit function

I had some question about the bootstrap capacitor on gate driver. First, the bootstrap capacitor is used because the voltage on the high side drivers gate need to be about 10-15 volts higher than the ...
33
votes
6answers
12k 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 ...
16
votes
6answers
4k views

Is it okay to use a MOSFET in its resistive region with a heat sink?

Using transistors in with limited gate (or base) voltage will make them limit current, which will introduce a significant voltage drop across the transistor, causing it to dissipate energy. This is ...
16
votes
2answers
37k 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 ...
13
votes
2answers
9k views

What is MOSFET gate drive capability and why do I care about it?

Someone told me that this circuit has "poor gate drive capability": simulate this circuit – Schematic created using CircuitLab What exactly does that mean? I tested it with an LED as a load ...
3
votes
2answers
838 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 ...
9
votes
4answers
16k views

How can I slow down the switch time of a MOSFET?

I have an NMOS that is switching too fast for my application. Into the gate I am sending a logic-level square wave (PWM). Unfortunately for me, as expected, the output is also a near square wave. How ...
0
votes
3answers
498 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 ...
6
votes
2answers
1k views

Should I gate SCRs on when reverse-biased?

I've been told that it's a bad idea to gate SCRs on when reverse-biased. Is that accurate? I'm reasonably confident that the SCRs won't actually conduct reverse-biased whether gated or not; are there ...
2
votes
3answers
1k views

pull-push gate driver for H bridge circuit

To drive power MOSFET following circuits with different pros and cons has been used type A type B type C type c which is called pull-pusher gate driver can used either P or N mosfet in h-...
6
votes
2answers
2k views

Why is my power MOSFET heating up when on?

I'm switching a 12V 500mA resistive load (LED strip) with a IRF540 MOSFET and it's getting very hot when it's on and conducting. This confuses me as MOSFETs are ...
4
votes
3answers
7k views

Driving high and low inputs of a MOSFET driver with a single PWM signal

(A typical circuit from FAN7390 datasheet.) I have high-side and low-side MOSFETs to drive. I read dozens of MOSFET driver datasheets, all of them have two separate inputs for controlling high and ...
3
votes
2answers
952 views

MOSFET Miller effect: length of the gate voltage flat area

As per Miller effect the gate voltage stops to grow at the threshold level until some certain moment: This can be explained as the drain to gate capacitance drives current through the gate. However - ...
1
vote
3answers
536 views

Will this circuit suffer from Shoot-Through? and is there a quick fix?

I'm considering a high-side, low-side driver using the DMG1016UDW COMPLEMENTARY PAIR ENHANCEMENT MODE MOSFET from diodes. The datasheet says The ON voltage is about 0.5V and ON the delays+rises is ...
1
vote
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 ...
4
votes
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 ...
3
votes
1answer
2k views

MOSFET gate transformer noise issue

I have built the following circuit. I am using a microcontroller via 3 transistors to drive the transformer and applying a 50% duty cycle 15kHz PWM signal. With 18V applied to the VIN header input, I ...
2
votes
1answer
860 views

MOSFET H-Bridge Design - Capacitor/Diode/Resistor Selection

welcome to my first post! I am designing a small 3-phase Brushless DC Electronic Speed Controller (ESC). The design utilizes 3 half bridges and a FAN7388 driver IC. The FAN7388 datasheet has a ...
2
votes
1answer
156 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 ...
2
votes
1answer
3k views

PMOS Gate Driver using BJT

I'm (again) looking at high-side load-switching. The load shall be switched on with a controlled rise-time (=limited inrush current) and be switched-off quickly when a controller (not shown) detects ...
1
vote
1answer
2k views

Input/output pin resistance for an AVR microcontroller

For example, when driving a logic-level MOSFET directly from a microcontroller, what is the smallest gate resistor that can be used? Specifically for AVR microcontrollers; i.e. this datasheet, the ...
1
vote
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 ...
0
votes
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 ...
0
votes
1answer
147 views

3KW SR motor gate driver and simulation questions

I'm designing power electronics for 3-phase 3KW SR motor by using power MOSFETS of rating 600V. To drive the gates of these MOSFETS, I'm using IR2183 gate drivers, one per each phase. The DC voltage ...
0
votes
1answer
232 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 ...