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Questions tagged [powermosfet]

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0
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2answers
25 views

How to drive a high side mosfet with the L6388E driver?

I've been trying to assemble a circuit to drive an n channel mosfet on a high side mode with this ST L6388E chip click here for the datasheet with this circuit: using 12V of a power supply and 5V ...
0
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1answer
46 views

(inverter repairs) Does reverse polarity can kill power MOSFETs in UPS inverters? [closed]

I had an old computer UPS (almost 7 years) and I modified it to use external battery (a 12 Volt motorcycle battery) since the old 12 Volt battery is completely dead and no replacement is available for ...
0
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2answers
59 views

How to find the core temperature of a mosfet

I’m designing a step up DC/DC converter and I have to find the core temperature of the MOSFET. The MOSFET is the 2N7000. I’ve been giving the VDS(ON) and the ambient temperature.
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0answers
27 views

Using a mosfet to disconnect 24v when 5v is appliied

I'm new to using MOSFETs and the datasheets are breaking my brain. I am designing an ESP32 based device. Input voltage will be 24vdc converted to 3.3vdc and will be the default condition. The device ...
1
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1answer
90 views

Ultrasonic Pulse Generator using Power Mosfet and Gate Driver. Confused about datasheet compatibility

I'm working on a project for University. The goal is to create an ultrasonic flaw detector that can measure flaws within a piece of metal. I have only taken introductory courses in the different ...
1
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0answers
43 views

MOSFET Driver P-channel

I want to create a DC-chopper to drive a motor. I found the following schematic online: However i don't understand how the MOSFETs are driven. On top there is a P-channel MOSFET with source connected ...
0
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1answer
46 views

What will happen if P-channel Enhancement type MOSFET gate kept open while connected as diode in real case

[ I am using MOSFET as diode for polarity protection of system. Vehicle supply of 12V is applied to drain & system is connected to source. Gate kept open purpose. I have simulated attached ...
0
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0answers
18 views

Gate voltage of power semiconductor devices in datasheets

Many static characteristics of power semiconductor devices are presented in available datasheets at a specific gate voltage. For example, they are achieved at Vge=15V for IGBT devices and Vgs=20V for ...
2
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0answers
56 views

Overshoot/undershoot issues in load current wave form of a MOSFET

We have designed hardware circuit which validates voltage regulator maximum output current. So we designed op-amp circuitry to control gate drive of the Power MOSFET and it will work in active region ...
0
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1answer
83 views

How to build a simple transistor switch?

How to build the following: A simple Transistor turn-OFF switch. A simple transistors circuit that has its own power source, but when I apply a second alternate power source then it will switch to ...
0
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3answers
115 views

How long do I have before my sensitive components get fried?

I'm using this IC (https://www2.mouser.com/datasheet/2/609/ADM1270-878589.pdf) to control the current and the voltage on some of the outputs of a PCB that controls the power to other PCBs, which have ...
3
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4answers
196 views

Burning a Power MOSFET

We are doing battery heat testing and want to be able to vary the current in the circuit to different test points up to 100A. Our circuit schematic is attached. The MOSFET is IXFN360N10T. We attached ...
0
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2answers
107 views

H-bridge motor controller [closed]

I made a circuit but I am not sure it is going to work. The circuit is supposed to drive a 36 V 28.5 A motor. I am having trouble finding out if applying 5V to IRLZ44PBF would open it fully and allow ...
0
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1answer
34 views

Ic and Vce equations of IGBT

I know in IGBTs while operating, parameters Ic (collector current) and Vce (collector-emitter voltage) are Tj (junction temperature) and Vge (gate-emitter voltage) dependent. Is there anything else ...
0
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1answer
37 views

Calculation of Vce from Ic-Vge Characteristic

We have found the Ic-Vge (collector current vs gate-emitter voltage) characteristic of an IGBT device as shown below at a high Vce (collector-emitter voltage) value (here 20V) from the datasheet (...
3
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4answers
200 views

Power MOSFET blew up when increased duty cycle from 5% to 10%

First, these are the components I'm using on my PCB, click on them to see the datasheets: U7: Infineon 1EDI60N12AF MOSFET Gate driver Q6: Infineon IRF250P224 Power MOSFET D5: Fairchild (ON ...
1
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1answer
119 views

Precaution and Rules to Paralleling Power MOSFETs

I'm going to use a Full Bridge Inverter for my application. The problem is that the current which flows through the MOSFETs when they are ON can reach 70A RMS and the power dissipation is too high. ...
0
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1answer
23 views

Lower maximum current rating on available motor driver .

I am designing an arduino controlled autonomous bot with 2 DC motors to control. The motors i have to use are 500rpm 12V Johnson DC motors with Torque : 8kgcm and No-load current = 800 mA(Max), Load ...
0
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0answers
48 views

Doubt about a mosfet regulator

I'm from Italy and I just subscrived here. I'm novice in electronics and I'm experimenting with some mosfet regulating circuit (HV) and in particular I've checked the following circuit which is in the ...
0
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0answers
71 views

MOSFETs get hots in 3 phase inverter circuit

I am trying to build a 1 kW BLDC inverter circuit. I used atmel328p processor, gate driver and 12 MOSFETs (irf3205). The MOSFETs swiches good, but when i connected to 1 kW motor at no load (with 20 V ...
0
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3answers
96 views

What can happen with the PCB foil while SMD resistor destructive overheat?

I need to protect the gate driving circuit by putting the resistor between the gate and the control circuit: During the testing of the mockup MOSFETs can go be destroyed which leaded to high voltage ...
1
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1answer
81 views

Why the MOSFET VDSS is measured at 250 µA?

General defintition of the MOSFET VDSS is " BVDSS is usually defined as the drain to source voltage when leakage current is 250uA" How this number 250 µA came? or What is the significance of this ...
0
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0answers
26 views

Using a power enhancement type n-MOSFET as a switch

I have been trying to construct a lamp switching circuit using a power n-MOSFET as shown on the circuit diagram above. The issue that arose is that the lamp immediately turns on when 220Vdc is applied ...
0
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0answers
294 views

Regenerative braking circuit for a BLDC Motor

I am trying to design a regenerative braking circuit for clamping the voltage when it is increased due to BLDC Motor acting as a generator. Simulation wise I am getting the exact result. But when I ...
-3
votes
1answer
349 views

arduino controlled spark plug with ignition coil

I am trying to built a ignition system which will have the following Spark plug Ignition coil (I don't know the spec of these. but this one is from Honda Activa) Some switching circuit I found ...
1
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4answers
600 views

How to calculate MOSFET internal gate resistance?

I was trying to figure out how to calculate the internal gate resistance of the MOSFET. For the purpose of analysis, Let's take the MOSFET as - BUK7Y3R5-40E From most of the documents I read, best ...
0
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0answers
243 views

MOSFET for PSU switching

I want to make a Bench power supply unit based on: For initial AC to DC conversion - ATX PSU (Enermax EG365AX-VE 350W) capable of providing 12V 26A Internally Step up module for powering the below - ...
0
votes
1answer
94 views

Proper power supply for this gate driver IC

I will use the gate driver configuration shown below: Gate Driver datasheet MOSFET Datasheet As you can see, the 5V and 12V are isolated. I chose this AC/DC converter for the 5V supply. It's 1 ...
0
votes
1answer
64 views

on-state voltage

I am trying to study an ever-on IGBT. in other words, IGBT is tried to be on in a long time. To this purpose, a +15V constant dc voltage is applied to the gate-emitter. But, when connecting a +2V ...
0
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3answers
68 views

Need help to find replacement for power mosfet IRF7303

I have to design a voltage regulator circuit using DC-DC controller MAX1655. Required voltage output from the circuit is 3.3V at 2A (circuit is shown at page 10 of datasheet). According to the ...
0
votes
1answer
93 views

Battery protection circuit

I’m trying to design a battery protection circuit for this 300mAh 3.7V LiPo battery. I’m an EE student which is designing his first pcb. Please forgive questions with obvious answers. My questions: ...
0
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1answer
175 views

Life cycle of power MOSFET as a switch in SMPS circuits

In many SMPS application (BOOST converter in particular), power MOSFET is used as a switch and it is driven by a PWM/IC at a frequency in a range of hundreds kHz (f = 200kHz for instance). This means ...
1
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1answer
52 views

Confused by MOSFET pins

So here is a MOSFET that I'm planning to use for a 10A constant current source. Look at page 3 where where they've shown how a 1 sq. in. copper pad affects the RθJA. Pins 1-3 is the source, 4 is the ...
1
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2answers
554 views

Circuit with dual power source: Replacing diodes with MOSFETs

I'm modding an already built circuit which can operate from the current of a USB port about 90% of the time but in some specific cases it needs to draw more than the 500 mA the USB provides (it is ...
-1
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2answers
128 views

How the does this circuit source 4-20mA?

In the circuit, how the mosfet flow the 4-20mA based on the resistor network?
1
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2answers
383 views

Mosfet based ripple filter for tube amp

I need some hint to fully understand how this circuit works (credits to Audio Design Guide): simulate this circuit – Schematic created using CircuitLab My doubts are in the operation of the ...
0
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0answers
30 views

Simplest implementation of LM5046

What is the simplest way to implement LM5046 in order to run two MOSFETS, where second MOSFET is 0.083us delayed?
0
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1answer
188 views

MOSFET turn off time way too long, why?

I would like to ask what is causing the following phenomenon. I've spotted this on my real buck converter at a low duty cycle first, then tried in my SPICE simulation as well which confirmed this. ...
0
votes
1answer
72 views

Mosfet blows on high load using gate driver

I am using LM5060 from TI for switching big modular N channel MOSFET in SOT-227 package (IXFN420N10T) for relative high 100-200A loads. On small loads like 10-20A it was working fine then we tried a ...
0
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1answer
85 views

Choosing a MOSFET driver - calculating gate drive current requirement

I am trying to understand how to select an appropriate MOSFET driver for controlling a DC motor. I went through quite a lot of literature from Texas Instruments and Microchip, but I am still not able ...
3
votes
1answer
167 views

Problems snubbing HF noise on flyback converter transistor

I am working on the design of a flyback converter based on the LT3751 capacitor charging circuit. My design is similar to the 42 A cap charger example on pg. 25 of the LT3751 datasheet. In my case, ...
0
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1answer
83 views

MOSFET gate drivers [closed]

This circuit requires two gate drivers to drive a push-pull configuration, can anyone recommend any since the source of the top MOSFET is floating it isnt as simple as a low-side driver. They would ...
0
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2answers
70 views

What Prevents load voltage from Flowing into Vsupply in this circuit?

Here, U1 is an optocoupler called TLP250. It is powered by Vsupply which is 12 V. V2 is the load voltage and it is at 24V. But it can be as much as 200V. My question is, that since both Vsupply and ...
0
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1answer
698 views

Why is there a gate-source short on the n-channel mosfet? (circuit attached)

I am having a problem with the circuit below. I am trying to use the IRLR8726TRPBF to switch a 24V pump by turning the Gate HIGH and LOW using the Arduino. However, there when I connect power to the ...
0
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0answers
38 views

PWM based control of MOSFET with two DC power output sources

I want to use a pwm pulse (high or low and constant) to select between two isolated dc battery sources as outputs. Both as the same voltage (24-25v) just different cell chemistry. Current will need to ...
5
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4answers
6k 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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2answers
105 views

Protecting my MOSFET

I'm working on a circuit to turn on and off a set of lights on a vehicle. I have to do the switching on the high side of the lights and need to use a positive voltage to trigger them on. So, I've got ...
1
vote
1answer
142 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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2answers
9k 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 ...
0
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1answer
82 views

Help Using a MOSFET

I have an N-channel MOSFET, part number IXFH30N50P. I am trying to use it as a switch for a 320V 8100uF capacitor bank. My idea is that I would have a separate, small voltage source, like a battery, ...