Questions tagged [powermosfet]
The powermosfet tag has no usage guidance.
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1answer
75 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
113 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
171 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
103 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
31 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
34 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
186 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
82 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
22 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
46 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
54 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 ...
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3answers
92 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
72 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 ...
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0answers
53 views
What is the maximum possible output current of the following equivalent circuit?
Following is the equivalent of the driver - MOSFET circuit.
simulate this circuit – Schematic created using CircuitLab
My intention was to prove the MOSFET-driver current driving capability. ...
0
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0answers
25 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
206 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
243 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
505 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
188 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
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1answer
93 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
65 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
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1answer
87 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
112 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
51 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 ...
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2answers
503 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
119 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
260 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
26 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
139 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
67 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
70 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
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1answer
148 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
72 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
68 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
497 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 ...
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4answers
5k 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
100 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
134 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 ...
6
votes
2answers
7k 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
votes
1answer
81 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, ...
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votes
3answers
357 views
Logic level mosfet to switch on 3.7v battery
Can anyone recommend a logic level mosfet(2v-5v gate) that can switch on/off a 3.7v lipo battery. Battery load will be 2-3 ampere on 3.7v-4.2v. I tried something like FQP30N06L but will only work on ...
0
votes
1answer
79 views
N- and P-channel MOSFETs in series
I'm currently trying to build a soldering station. Everybody on the internet uses AC-voltage for that, but I haven't really found the reason for that. So I thought "Well, let's build one and see if it ...
0
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2answers
91 views
Why high current MOSFET is driven with another transistor
As the power rating of the MOSFET is increasing in the case of continuous current and the Max voltage rating, i see people drive the gate of MOSFET with a transistor. Could you explain the reason for. ...
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3answers
518 views
Does the MOSFET gate have an absolute maximum gate voltage?
Considering this full bridge circuit , if the bus voltage is about 400 v, Do I need a higher voltage at the gate to turn the mosfet on (to make the gate voltage higher than the source voltage)?
The ...
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0answers
434 views
Buck converter freewheeling diode short circuit damaging the FET
I have a classic buck converter configuration (http://en.wikipedia.org/wiki/Buck_converter) with IXFK120N65X2 power mosfet used as switch and VS-8ETL06PbF used as freewheeling diode. The input voltage ...
0
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1answer
291 views
IGBT Gate driver design question
High!
I'm looking up some Tesla Coils on internet and I have a question about a particuliar part of the schematic. In the IGBT gate driver circuit, there are resistors and diodes which I'm unable to ...
1
vote
1answer
31 views
MOSFET trio/quartet viable option?
I need to supply 10-15A at variable voltage without anything getting too hot. Is it good practice to use several MOSFETs to handle larger currents?
I am currently using an IRF9630 P-FET with an ...
0
votes
1answer
147 views
Can MOSFETS work as perfect switching voltage dividers in practical?
Hi, I tried this circuit both in simulation and in practical manner. Below i used a gate driver IR2112 to drive the gates of the two mosfets, which boosts my PWM 5V amplitude signal to PWM 15V. My ...
