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Questions tagged [gate-driving]

MOSFET and IGBT gate driving

4
votes
3answers
17k 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 ...
31
votes
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 ...
15
votes
6answers
3k 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 ...
12
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 ...
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 ...
9
votes
4answers
15k 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 ...
3
votes
1answer
512 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 ...
0
votes
3answers
372 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 ...
4
votes
3answers
6k 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 ...
1
vote
1answer
944 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 ...
1
vote
3answers
476 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 ...
0
votes
3answers
368 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-...
3
votes
1answer
148 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 ...
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
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 ...
2
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 ...
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 ...
1
vote
1answer
1k 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 ...
0
votes
1answer
202 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 ...
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 ...