Questions tagged [powermosfet]
The powermosfet tag has no usage guidance.
217
questions
0
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1answer
65 views
Low loss method of connecting two dissimilar battery voltages together without a diode?
TLDR; Is there a simple circuit which delivers a diode's robust reverse-voltage behavior, only with an order of magnitude less heat generation?
I have two lithium batteries with different chemistries ...
0
votes
1answer
72 views
Would this be an appropriate design for interfacing high-power LEDs with an ESP32?
I am currently exploring a project that allows me to control high-power RGB LEDs using PWM from an ESP32 microcontroller. In this way, I plan to create a simple LED panel for canopy illumination that ...
0
votes
1answer
41 views
High-Side P-Channel MOSFET for Lower Rated Toggle Switches
My goal is to add two toggle switches to high power DC lines so that I can break the circuit and stop power from being delivered to my load. This load will be using 28V, ~27A. I have an two channel ...
0
votes
1answer
39 views
Why does max current handling differ greatly form different MCU boards?
I had successfully controlled my power inverter using an Arduino DUE (Atmel SAM3X8E). To drive all of my six power MOSFETs (IRLZ24N) each GPIO is interfaced by a Photovoltaic MOSFET Driver (Panasonic ...
-2
votes
1answer
56 views
FET Gate Voltage Question
What gate voltage is required to turn on a power MOSFET to the specified Rds(on) at a given drain current?
Take for example, 1.5A drain current using this FET. https://www.vishay.com/docs/78092/...
-1
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1answer
43 views
MOSFET Vds is too high when MOSFET turn on
Few days ago, I upload question about MOSFET driver getting too hot.
That problem was solved by your help. thank you.
But I have another problem. I connect 80ohm load to MOSFET like this figure.
...
-1
votes
1answer
59 views
Heatsink size calculation
Let's say I found a random heatsink with no name or model or anything else from which I can find a datasheet and get its thermal resistance. Therefore, simply by knowing its sizes, how can I calculate ...
0
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1answer
48 views
I don't know why UCC27324 getting hot in normal condition
I have some question about UCC27324P MOSFET driver.
I have experiment using UCC27324D (8-DIP type) and UCC27324P (SMD type) via this circuit.
DIP type driver works fine with no problem same condition.
...
0
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1answer
58 views
Is there MOFET with Id is between 10-14A at Vgs<4.2V? [closed]
I am new to the area of working with MOSFETs. For my current project I need a suitable MOSFET or any other transistor, that should work as a switch. My output controlling voltage from controller IC is ...
0
votes
1answer
41 views
Rated drain to source voltage of a power MOSFET sustaining back EMF of solenoid
I have an H-bridge that is using 4 n-channel MOSFETs with max rating of 500 V 100 A drain to source driving a large inductor/actuator reliably. I'd like to find a cheaper MOSFET since the 100 A is ...
0
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2answers
103 views
MOSFET failed when I connected an AC universal motor
I connected the following AC chopper circuit to control the brightness of a lamp and it is working as expected.
Expected behavior: I observe that when the pulse is 0, the light is completely off. When ...
0
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1answer
41 views
How should fuses be used for MOSFET temperature protection?
I am using high voltage MOSFET in TO-220 package with a heatsink like this one:
Under normal conditions, the temperature of heatsink does not exceed 90 degrees.
My MOSFET can run up to 120 degress ...
4
votes
2answers
113 views
What does the cross point of V-I curves mean?
Here you see a V-I graph including many curves achieved under different junction temperatures of an IGBT. As it can be seen there is a cross point where all curves intersect each other. Does it make ...
2
votes
1answer
53 views
Mitigating parasitic turn-on of MOSFET
UPDATE
Thanks Aaron and jp314 for your comments.
We just probed some more and I think jp314 is right.
We found that the high side driver was skipping some pulses. The pink pulse train is from the ...
0
votes
2answers
140 views
MOSFET back-to-back configuration
To build the back-to-back configuration using MOSFETs, must the second MOSFET be the same as the first or do I need a complementary MOSFET transistor like in BJT transistors? If I need a ...
-1
votes
1answer
79 views
P Channel MOSFET gate controlled by N Channel MOSFET (rather than NPN). Crazy?
I needed a generalized circuit that would switch on/off any device on the Vcc side with varying voltage (3.3 to 24 V) and current (0 to ~10 A). A P Channel MOSFET is an obvious choice, but I didn't ...
2
votes
1answer
63 views
Can SiC SoA rating be extrapolated for faster pulse widths?
This datasheet for a Rohm SCT3017 silicon-carbide N-channel power MOSFET's Safe Operating Area only extends as fast as 100µs. Why no trace for 10µs?
Is it because with an expected gate charge of ...
1
vote
2answers
149 views
Sender Circuit for Ultrasound
I'm building this Instructables project: Body-ultrasound Sonography With Arduino, which is using ultrasound to see inside the body. However I'm having some issues with the sender circuit, shown below:
...
0
votes
1answer
129 views
How to attenuate the noise in the current due to the MOSFET switching
I am making a controller to like dimmer to reduce the voltage from a microcontroller. I am using the following circuit.
However, I see that this is introducing noise into the current. I need help to ...
0
votes
3answers
129 views
Buck Converter Simulation in OrCAD Capture Lite
I have this really simple buck converter circuit but I am getting really funny results.
I tried different input voltages (12-650 V), no matter what I put, it doesn't affect the output. The output ...
0
votes
3answers
145 views
What is the best and compact method for varying AC current between 1mA to 100mA for a 500VAC?
I am working on a testing project. The objective is to test an equipment which assures safety to personal when there is a certain current passing through earth wire. So, I must emulate an unsafe ...
2
votes
1answer
101 views
Calculated vs. Measured MOSFET Switching Times
I am currently evaluating several power MOSFET’s looking at their switch on and off times.
My testing has employed a few different gate drivers, however the bulk of my testing is with the ST Micro ...
0
votes
1answer
53 views
Boost converter Ic extremely heats up when trying to switch using Mosfet
In Case 1, the converter works fine but in the other case it heats up extremely.
Tried same using a PNP nosfet and it heats up the same as soon as load is connected.
12v 1A router is used as a load ...
2
votes
2answers
459 views
Why are there no P-channel SiC (silicon-carbide) FETs?
Looking at the top distributors, seems only N-channel power SiC are carried. Why is that?
0
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1answer
57 views
Data Sheet help: Current flowing through a MOSFET module
In a MOSFET module, when looking at the data sheet can I assume the current through each MOSFET device is the given Id, or is Id the current moving through the entire MOSFET module?
For the data sheet ...
5
votes
1answer
166 views
What is the purpose of voids near thermal pad in a MOSFET?
http://www.aosmd.com/res/data_sheets/AONP36336.pdf
Why do MOSEFT manufacturers provide a void as shown below?
0
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2answers
144 views
Help with esp32 and mosfet
simulate this circuit – Schematic created using CircuitLab
My project requires switching a 4 ohm solenoid at 24v for 200ms to turn on a water supply and then -24v to turn it off. Previously I ...
0
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0answers
34 views
Driver output to FET gate voltage - rise & fall time
I have an ISO driver with the following params: Peak source current = 4 A, Peak sink current = 6 A, Sink resistance = 0.55 ohm, source resistance = 5 ohm.
How do I calculate the time between the rise/...
0
votes
2answers
72 views
H Bridge MOSFETs burns after a few seconds
i've this circuit, the inpust H1, H2, L1, L2, VS1 and VS2 are unconnected (are the outputs of the mosfet driver) only i power-up with 12V, I only connect the 12V, after a few seconds the mosfet ...
1
vote
3answers
130 views
MOSFET switching failure
I am working on a power electronic application. I am using push-pull converter topology.
I am using IRF630 power MOSFET to do switching. I also use primary side center tapped transformer Np/Ns = 1/13 ...
0
votes
1answer
63 views
push button controlled PMOS high side switch circuit review
I have been working on a project and one of the ideas was to control the power supply by push button. In a normal case, the SW1 is open, the 5v_POWER supplies the 5V_IN; when the SW1 is closed, the ...
0
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0answers
161 views
How to avoid current spike through the MOSFET of push-pull converter at low duty cycle?
I have designed a Push-pull converter as shown:
The input is 30V and the output is 400V with the power of 400W.
I have designed the MPPT algorithm, magnetic components, etc and the circuit is ...
0
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0answers
46 views
I need more information about PowerPAK-SO8 thermal properties than i can find online
There are these MOSFETs in PowerPAK-SO8 (Vishay) package (or SuperSO8 for Infineon). I used to cool them from the outside, attaching a heatsink to the black (plastic? ceramic?) case worked pretty well....
0
votes
1answer
104 views
Estimating case to ambient thermal resistance when it is not given in the datasheet
I'm trying to estimate the case to ambient thermal resistance of a GaN switching device (specifically the GS66508T device from GaN Systems). The datasheet provides the junction to case thermal ...
1
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0answers
73 views
Revision and component selection of MOSFET driver circuit
I'm developing a board to drive 5 LED strips with 1A maximum current. I need some help for design validation and component selection.
The circuit is the following (repeted 5 times). The PWM signals (5 ...
0
votes
3answers
41 views
Can I use the P3020L Mosfet with 5>Vgs>3 without any linear region consequences?
So I've been searching for a long time, for a power mosfet I can switch safely at a Vgs of 3V. I'd like to know if this is the one, because luckily, I recovered it from a computer power supply, thus I ...
0
votes
1answer
62 views
is it safe/practical to control this 30A+ motor with mosfet?
I'm thinking of controlling a few high ampere water pumps from microchips.
the current draws of motors will be around 38A (single phase 220V motors).
is it safe to use a MOSFET (IPW60R070C6 from ...
1
vote
0answers
87 views
MOSFET Bootstrap circuit simulation with NGSPICE
Preface
I am designing a Solid State Relay as an educational exercise, to catch up on what my university did not teach me. I am a long time Linux user and open-source software lover, which brought me ...
0
votes
1answer
98 views
Unexpected huge MOSFETs power consumption
I have 2 MOSFETs :
NMOS -->
Ref :BSZ520
Rds_on : 52 mohms
PMOS -->
Ref :IRF9640
Rds_on : 500 mohms
My ...
4
votes
2answers
845 views
Am I reading this MOSFET datasheet right?
Sorry for the lame question, but I am a software developer, and have only a limited understanding of analog circuits.
The ODrive uses the MOSFET NTMFS4935NT1G (since v3.2) in pairs.
This test says ...
0
votes
1answer
52 views
MOSFET N loss power battery calculation
I have a circuit to calculate my battery level using NodeMCU.
I use this formula:
...
0
votes
1answer
87 views
Flyback diode choice
I am curious about how to determine the turn ratio to get the minimum power loss. Assuming n=Np/Ns Vin=380, Vo=40, different turn ratios can get the same output because Vo =VinD/(n(1-D)).
When the n ...
0
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0answers
83 views
Parallel MOSFET and H-Bridge
I need to control a 12V 100A DC motor and I was thinking of using this circuit, I saw many post and application notes that talk about parallelizing MOSFETs but I did not see any circuit using MOSFET ...
0
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0answers
29 views
Can I use 2 H-Bridge for drive a motor?
I've a 12V 80A motor, for drive this i'll use a H-bridge with mosfet, in order to divide the current per H bridge we can drive a motor with 2 H-bridge? I'll use mosfet, we cant put mosfet in parallel
0
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4answers
159 views
TO-247 case maximum current
I've this TO-247 MOSFET
http://www.datasheet.es/PDF/203551/2SK3271-01-pdf.html
how much current will support this case? I've to control a 12V 80A DC Motor
2
votes
1answer
98 views
Is there a simple IC for disconnecting a power source?
I'm looking to create a simple circuit to connect/disconnect a power storage capacitor to/from a larger circuit. In the model railroading world, we use capacitors as "keep-alives" to keep ...
0
votes
0answers
55 views
Buck converter high side switch GND
In Figure 1, I designed a synchronous buck converter using the IR2110S half bridge gate driver integration. However, when I look at the source-GND measurements of the high side MOSFETs in Figure 2, I ...
1
vote
0answers
55 views
How can I turn off a MOSFET when the temperature rises?
I am using a MOSFET as a pre-regulator.
When the voltage is too high, the temperature of the MOSFET is getting too high. (Even if I take 15 mA current.)
As a safety precaution, if the junction ...
0
votes
2answers
69 views
Why is the voltage drop over my MOSFET so large?
I am trying to use an NCV8403B N-channel power MOSFET to control the power for my circuit.
The schematic itself is quite simple:
The MOSFET is controlled by an SPST switch. When in the ON position, ...
0
votes
1answer
200 views
How to modify a buck converter for higher current output?
I have a 17V DC power supply which can provide around 50A. I want to build a battery charger using it which outputs 14.6V constant voltage. Therefore, I'm planning to manipulate low cost, widely ...
