Questions tagged [gate-driving]

MOSFET and IGBT gate driving

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3answers
96 views

Why we need two resistors to control the gate voltage of a PUT transistor?

Looking the follow schematics you can see two resistors 15k and 27k that are controlling the gate voltage of the PUT (programmable unijunction transistor) transistor. My question is why we need two ...
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1answer
42 views

What is the use of the diode connected anti parallel to the gate resistance in the general MOSFET/IGBT gate driver circuit?

From my limited knowledge, the only advantage of providing a parallel path through diode with a lower resistance across the main gate resistance is the high speed turn off of the power electronic ...
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1answer
41 views

Electrical Switch for LED’s (Providing enough MOSFET gate voltage)

I am designing a circuit to independently control (ON/OFF) up to 8 LED strips. So 8 independent channels The LEDs are of a single color (Not RGB). LED’s are also rated 12V. The controlling signal is ...
0
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1answer
24 views

HCPL-3120 gate driver

I am trying to use a gate driver HCPL-3210 for an IGBT but one of the big disadvantages that I can notice is that each chip needs its own power supply of 15 V. So as a total I would need 4 power ...
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2answers
47 views

Isolated MOSFET gate driver VCC and VDD power suppl

I am planning to use UCC21520 for HV SiC MOSFET based full bridge design. My operation frequency would be around 100kHz. I selected UCC21520 in order to achieve the isolation between the power and ...
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0answers
18 views

Parameters for VAC 5046-X005 gate pulse transformer

I'm trying to parameterize this device to find a suitable equivalent. Trouble is, there seems to be no datasheet available, and one of the two secondaries are measuring open, so complete measurements ...
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0answers
52 views

component identification by the image

I was troubleshooting a transformer coupled MOSFET gate driver circuit. I found the sot-23 package component having the part details in photo which I was not able ...
0
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1answer
67 views

Is it possible to reduce the Miller's plateau voltage?

Consider the following circuit: Image source: Simplified Clamped Inductive Switching Model - Figure 3 from "Fundamentals of MOSFET and IGBT Gate Drive Circuits by Texas Instruments" I would like to ...
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2answers
64 views

Gate Driver HCPL3120

I want to use HCPL3120 gate driver: Its data sheet is here: https://www.mouser.com/datasheet/2/678/V02-0161EN_DS_HCPL-3120_2016-03-21-908803.pdf On page number 22 there is an excellent design for ...
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2answers
67 views

Connecting a low-side gate driver to a FET with current sense resistor

When connecting a low-side FET gate-driver to a FET (N-channel MOSFET) that has a current sense resistor connected between its source and ground, where should I connect the ground of the gate driver? ...
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0answers
39 views

Can someone explain this high-speed P-channel MOSFET drive circuitry?

I found this circuit in an application note on P-Channel Power MOSFETS. The note explains that modern technology has made it possible for P-Channel MOSFETS to approach N-Channel performance in power ...
1
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1answer
39 views

Charge Pump for P-Channel MOSFET

Many N-Channel MOSFET drivers for high side switches and high speeds have charge pumps that can provide enough current at high voltage to drive the gate high and sink the current back out again. I ...
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0answers
57 views

Si8234 PWM with “disable” pin

in the datasheet of the Si823x family of gate drivers, the Si8234 is mentioned as being a high-side/low-side driver with PWM input, but actually this "PWM" input pin is only there for switching ...
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0answers
28 views

Why do we require isolated supplies for gate drivers in 3-phase inveters?

I have used isolated supplies while making optocouplers based drive circuitry for driving 6 IGBT switches in 3-phase VSI in my undergrad projects. I remember my professor kind of explained why exactly ...
0
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1answer
43 views

Calculating resistance for integrated circuit with logical gates, so that the circuit works properly

I have found this task with its solution: For the circuit shown below calculate \$R\$ so that the circuit works properly. All gates belong to the \$TTL\$ series. Solution: $$\begin{...
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1answer
104 views

mosfet gate charge

Because I was worried about the gate inrush current of a p-mosfet, because of a lacking gate-resistor, I decided to measure the switching times with an oscilloscope. I also considered another ...
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0answers
29 views

High Side - Low Side Driver selection

I'm currently using a pair of IPT015N10N5 FETs in half bridge configuration, to drive a motor. The FET gates are driven by a UCC27211A-Q1 High Side/Low Side driver. I'm thinking that this particular ...
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0answers
41 views

How to generate time delay when input frequency is high?

Im trying to generate time delay for my gate drivers for a project im working on. But the issue is at lower frequencies my circuit works fine, as I ramp up the frequency (upto 250Khz) the output goes ...
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0answers
39 views

N-MOSFET not passing current when gate is high (SPICE)

I'm having a very strange issue with some power MOSFET circuits I'm trying to build for regulated high-current pulses. I can get my circuit to work fine when I use a lower-amperage power MOSFET, but ...
2
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1answer
111 views

H-Bridge Gates Stuck On

I've developed an automotive H-Bridge circuit using the DRV8702-Q1. It's pretty close to the reference schematic in the datasheet but it doesn't work. I've been racking my brain for ideas as to what ...
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2answers
107 views

driving mosfet gate with an npn bjt

simulate this circuit – Schematic created using CircuitLab Today I saw an led dimmer product. the driving circuit was like in the schematic. it was a cheap one but the circuit looks inefficient ...
0
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1answer
67 views

Is isolation required for MOSfet gate driver's and microprocessor's power supply?

I have designed a 62W , 24V-5V buck converter operating at 250KHz. I am using TI's UCC27200A gate driver and Infineon's Optimos 4. The problem is that the driver doesn't have any kind of isolation ...
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4answers
142 views

Math behind Zener resistor for MOSFET Vgs

The following circuit is from Texas Instruments: http://www.ti.com/lit/df/tidrb35a/tidrb35a.pdf What is the math behind the string of six 470k resistors at the MOSFET gate? I know that they are for ...
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0answers
78 views

H bridge circuit using FAN7392

YELLOW- LOW IN RED - HI IN BLUE - LOW SIDE OUTPUT GREEN - HIGH SIDE OUTPUT I have designed a H bridge circuit using FAN7392 & 25N120NDH IGBT. The voltage I want to switch for now is 24 volt ...
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1answer
50 views

Measurement of Quiescent Current and Operating Current in Gate driver

In datasheet they have provided two parameters named Quiescent Current and Operating current in which I am measuring quiescent current i.e, ground current flowing from the device VDD to GND , when ...
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3answers
133 views

IGBT Gate driver sink or source current

I will drive a load low side with IGBT. IGBT gate-emiter (Threshold) voltage will be 12 V. This voltage level is enough for my load current. I will use a gate driver. When ı search gate driver for ...
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0answers
53 views

pwm half bridge inverter- split capacitor voltage alternating

In the half bridge inverter shown below, when driven by a PWM signal, the voltage Va (the voltage in-between the two capacitors C1 and C3) is a sine wave. I was expecting it to be a constant voltage ...
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1answer
36 views

High/ Low level output voltage in gate driver datasheet

Gate driver datasheet mentions about VOLL and VOH with test conditions Iol=100mA I am testing this using this setup by calculating value (ron of pmos is 7.05 ohms) of load to be placed, Is this ...
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2answers
64 views

Propagation delay and its measurement in datasheet

I am referring to Gate driver LM5102 Here the terms are bit misleading 1] Lower turn off propagation delay 2] Turn on delay But application curves uses different measurements symbols(tp/tdl)/...
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3answers
2k views

Why have both: BJT and FET transistors on IC output?

This is the structure of FAN3100 gate driver IC: (taken from its datasheet) As you can see - there are two ouput switches: CMOS and BJT. Why they put them both?
2
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1answer
119 views

Half Bridge with PWM- gate signal problem

After making a half bridge inverter using a square wave (I asked a question on this website about it previously) I have now decided to use PWM signal in order to obtain a sine wave output and have ...
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0answers
75 views

Bootstrap capacitor calculation - Which formula should I pick?

In order to calculate capacitance of bootstrap capacitor, I searched around and found two different formula from Ti and Infineon. The Ti version states: while Infineon version say: I think the basic ...
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5answers
2k views

Should I use a resistor between the gate driver and MOSFET (gate pin)?

I'm making a PWM driver for a DC motor. After some questions were answered in this post, I ended up with this schematic: And I have some new questions: Do I need a resistor between the gate and the ...
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1answer
44 views

What is the benefit of a mosfet gate drive which is constantly biased instead of driving to ground?

I recently came across a circuit with a drive signal which never went to ground, and instead always kept the MOSFET biased. What it the reason/benefit of doing this? I've drawn an example like the ...
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2answers
58 views

Half Bridge Low Side Mosfet vs. Flyback Diode

I intend to use this high side switch in a PWM application with a brushed 12V motor drawing 8A steady state max: https://www.nxp.com/docs/en/data-sheet/MC33981.pdf The switch allows for a half bridge ...
0
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1answer
49 views

How to find Gate charge

I want to drive a 650V 21A SiC mosfet at 100kHZ. Would this mosfet driver be able to drive the mosfet? How can I find Gate charge of the mentioned mosfet gate driver? The mosfet I am planning to ...
0
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1answer
75 views

Mosfet Gate Resistor

I am building a high power ZVS induction heater. I originally used this famous design. It worked like a charm when I used a 48v 31A power supply. But I want an upgrade. I recently got a few of these ...
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0answers
101 views

Can't run mosfets in one leg configuration with ACPL 337J optocoupler

I am working with a four pin MOSFET(C3M0030090K). You can find the datasheet here. The gate driver which I am using is ACPL 337J (datasheet here). The mosfets are in one leg configuration like this: ....
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2answers
72 views

voltage divider driving PMOS with slow turn-off time

I have a voltage divider that is driving the gate of a high side PMOS switch. The voltage divider turns the PMOS on once the NMOS is turned on by a 5v logic controller. The PMOS turns on ...
4
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2answers
188 views

Mosfet gate driver have no direct connection to ground

This picture shows some part of a high frequency (about 250kHz) MOSFET gate driver circuit.I searched for various types of gate drivers in google and didn't encounter anything like this. Can someone ...
5
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1answer
192 views

How to speed up level shifter?

I have a level shifter that uses a transistor to control the gate of a high voltage P-channel MOSFET, like this: simulate this circuit – Schematic created using CircuitLab This is designed to ...
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0answers
46 views

When I use two IR2110 for full bridge, dose supply voltage of IR2110 need isolation?

I found the question that explains logic supply voltage (VDD, VSS) and gate drive supply voltage (VCC) are not isolated. And according to datasheet reference circuit, it seems to be non-isolated ...
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0answers
30 views

Why Dspic304011 Controller's PWM stucks to 50% duty cycle when DC link Voltage is turned onn before the gate votlage turned onn in SPWM inverter.?

I have implemented SPWM inverter that take input from grid (230V AC) and convert this to DC link voltage 320V and this DC link voltage is converter to desire frequency. The gate driver IR2136 is used ...
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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 ...
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0answers
74 views

Mosfet Gate Pull-Down and Gate Resistor Failure

I'm trying to make an inverter which has a dc bus of 350V and output of 220V(spwm). The problem is I've run the circuit two times and in the first one the gate resistors explode and in the second one ...
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0answers
296 views

Driving of a MOSFET using optocoupler in 180-to-24V buck converter

i have a problem with driving a MOSFET in a converter, let me explain. I need to build a Buck Converter with the following requirements: Input 180 V (From a 120 VRMS rectifier circuit) Output 24 V No ...
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2answers
62 views

Off-the-shelf Device for Logically Controlling 12V Loads [closed]

I built a circuit that allows me to control a load current using logic by using a P16NF06L MOSFET. Here is the circuit: source What I need now is something that does the same thing but has multiple ...
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2answers
133 views

P-Channel Mosfet Gate Drive Topology with 20V Vgss Protection?

NOTE: This question concerns topology - circuit values are omitted intentionally. I'm strongly considering the use a P-Channel mosfet to serve as a high-side switch within a circuit. All P-Channel ...
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0answers
62 views

Alternate uses for Gate Driver - Driving a Load without External IGBT or FET

What issues would one encounter by using a gate driver IC to directly drive a load instead of using it to drive transistors? For consideration would be the very affordable Infineon 2EDN752x series ...
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2answers
754 views

IGBT transistor with auxiliary emitter

Recently I discovered, that some IGBT transistors in IGBT modules have the second pin for an emitter, called auxiliary emitter. In the picture above 2nd and 4th pins are auxiliary emitters. This is ...

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