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0
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3answers
74 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
vote
1answer
65 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
50 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
votes
0answers
24 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
76 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
89 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
vote
4answers
403 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
votes
0answers
121 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
90 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
61 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
votes
3answers
63 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
84 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
votes
1answer
79 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
vote
1answer
50 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
vote
2answers
322 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
votes
2answers
110 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
vote
2answers
134 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
votes
0answers
23 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
votes
1answer
94 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
61 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
votes
1answer
59 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
126 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
votes
1answer
67 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
votes
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
votes
1answer
338 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 ...
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votes
0answers
37 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
votes
4answers
3k 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
votes
2answers
96 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
118 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
5k 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, ...
2
votes
3answers
275 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
76 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
votes
2answers
89 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. ...
1
vote
3answers
406 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 ...
0
votes
0answers
349 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
votes
1answer
221 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
135 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 ...
0
votes
0answers
51 views

Will this one-switch resonant topology work?

simulate this circuit – Schematic created using CircuitLab Will this thing work? I do not mind the horrendous amount of interference this may produce. Principle of operation is: Switch-on ...
0
votes
1answer
101 views

How is the dV/dt of the controller voltage constant?

Theory of operation: When the switch is turned on, R1 feeds voltage to the FET gates, which will be clamped by the zener diode. Initally, the controller (-) will be at the same voltage as controller (...
0
votes
1answer
963 views

What is the maximum acceptable soldering temperature for a MOSFET?

I need to manually solder with a soldering iron an LFPAK56, Power-SO8 package MOSFET. I am reading that the maximum junction temperature for the device is 175C. Soldering iron go way over that ...
0
votes
1answer
964 views

Cut-off circuit for 12V battery

I have a simple arduino driven charger for solar energy to pass into 12V lead-acid battery. However, to use the stored energy I need an analog circuit to cut off discharge at 11.5V. I think a voltage ...
0
votes
0answers
225 views

Safe MOSFET fail open mode

I am working with a circuit that is supposed to act like an incandescent light bulb (ilb). I will use a power resistor to eat the power the ilb normally would. The circuit will have the possibility to ...
0
votes
4answers
230 views

Electronic load MOSFET drain to source current suddenly increases

My questions: Why would the drain to source current of MOSFETS suddenly increases. What can be done to resolve it? I am aware that there is supposed to be an increase in current as soon as the gate ...
0
votes
1answer
206 views

Led Bulb Flicker when duty cycle is below 40%. What is wrong with circuit?

I am working on project to dim the LED bulb(Dimmable) with Atmega328. Everything works fine when duty cycle is above 50% but as soon as i am decreasing duty cycle below 50% LED bulb start flickering. ...
0
votes
0answers
279 views

Battery Protection MOSFET 8205A Replacement

I am planning to add battery protection to a schematic for a project that is using the Panasonic NCR18650B 3400mAh 3.7V 18650 Li-ion Battery. The protected version of this battery uses the protection ...
7
votes
2answers
257 views

Power Mosfet Gate Voltage

The early Power Mosfets were deemed to be fully enhanced with 10 VDC between gate and source. The gate source threshold voltage was defined for 1mA drain current and would be between 2 and 4 VDC. The ...