Questions tagged [powermosfet]
The powermosfet tag has no usage guidance.
197
questions
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29 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
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2answers
59 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
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3answers
87 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
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1answer
51 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 ...
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0answers
78 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
28 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
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1answer
35 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 ...
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0answers
41 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
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3answers
36 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
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1answer
58 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 ...
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0answers
25 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
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1answer
95 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
787 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
47 views
MOSFET N loss power battery calculation
I have a circuit to calculate my battery level using NodeMCU.
I use this formula:
...
0
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1answer
78 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
46 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 ...
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0answers
27 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
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4answers
74 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
87 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
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0answers
39 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
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0answers
39 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
65 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
69 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 ...
0
votes
1answer
60 views
I don't understand why this circuit works with MOSFET
This circuit works, Vgs = 12V, when IN1 = 0V the circuit lets pass an external current that comes from A and goes out through OUT1, for them to happen the voltage between gate and source must be 12V, ...
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0answers
35 views
Power MOSFET behaving differently at high Vds
I am trying to switch a circuit continuously by pulsing a power MOSFET(IXTN660N04T4) with a function generator. I have attached my set-up below. IXTH500N04T2 was only used for simulation. Their specs ...
0
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1answer
49 views
Primary Battery and DC Power Switch
I have designed the below circuit to automatically switch between a primary cell (3v) battery, and if available, an external DC power supply (~3.3v). Since the cell is a primary cell, it needs to be ...
0
votes
1answer
32 views
Transistors choice for buck boost converter using LM34936
I've been using TI's Webench online design tool for buck boost design purposes that uses LM34936.
The simplified schematic in LM324936's datasheet looks:
Webench design tool generated 4 different MOS ...
0
votes
1answer
98 views
Half-bridge gate driver fried, how can I make my design work?
I made a half-bridge following the recommended schematics from the IRS2184 datasheet.
However when I powered it, it triggered over-current and got quite hot.
Here is are schematic and routing.
I ...
1
vote
3answers
109 views
Power sequencing two +5V rails without a voltage drop
I'm new to power sequencing and wanting input on the best way to solve this problem.
I have two separate +5V rails on my PCB coming from a rectified wall source and USB. Due to back powering issues, I ...
0
votes
1answer
164 views
ESP32 grilled with simple MOSFET switch for 12V water pump
I've soldered a small PCB around an ESP32 with following components:
ESP32 Dev v4
Water pump with 12-24V and 4.5-6W rating
Power supply with 12V and 1A rating
Capacitive sensor with analog output
...
2
votes
1answer
70 views
Will replacing MOSFET with a MOSFET with lower rds(on) reduce the thermal characteristics?
I want to replace a MOSFET in a legacy product. The MOSFET is a P-channel Power MOSFET that is used for PWM switching purposes (VGS @ -12V, PWM is 20% @ 200us). The FET is switching in to a 200uH, ...
0
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2answers
128 views
Multiplexing 24V signals to DC load generator
(Electronics beginner)
I have a DC load generator (TENMA 72-13210 a rebrand of Korad KEL103).
I want to use if for testing a custom board designed in-house with 30 outputs each capable of driving 10A ...
2
votes
2answers
376 views
How to effectively control a Peltier device with MOSFETs? (general design and heat issue)
First, I'm still quite a novice in the electronics, so may miss some basic knowledge, but trying to learn anyway. That being said, here's my situation:
Goal: Control of the direction of the heat ...
1
vote
3answers
107 views
Using a MOSFET as a relay in mains-powered circuits
I am currently planning a small project where I use a Raspberry Pi as a smart home server to switch loads (mainly door openers & lights).
The usual way would be to use a mechanical relay with ...
0
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0answers
41 views
Boost converter, why the voltage derates when frequency rises?
I am simulating a boost converter in ltspice.
vin=3V, vout_bst=12V, ideal inductor, capacitor, diode and voltage source.
When I use an ideal switch, raising the frequency doesn't affect the output ...
0
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0answers
63 views
Driving Power MOSFET with Optocoupler Problems (Component FOD3182)
simulate this circuit – Schematic created using CircuitLab
So I am trying to build a BLDC motor controller using a Teensy4.0, FOD3182 Optocoupler, and some power mosfets. Currently I am working ...
2
votes
2answers
103 views
Confused on the notation from a TI datasheet
So I'm trying to implement this IC onto a controller that I'm designing: https://www.ti.com/product/UCC5350 I understand for the most part how to apply it, I am just lost on one key part
The specific ...
0
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3answers
46 views
Doubts in using UCC27537 Gate driver to drive IPA60R120P7XKSA1 MOSFET
I want to use UCC27537 gate driver to drive IPA60R120P7XKSA1 MOSFET but I have some doubts.
To avoid voltage oscillations at the gate, do I need to include resistors in between MOSFET and gate-driver?...
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votes
1answer
80 views
Why is p-mosfet used in power load-switch circuits
Attached is the snapshot of Xilinx evaluation board schematics. I referred most of their schematics and observed that p-channel mosfet are used in power circuits. Is there any special advantage of ...
0
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3answers
83 views
Understanding these Mosfet Data sheet Specs
So my local electronics store has a catalog of MOSFETS they sell.
I’m having a little trouble interpreting some of the specs.
In particular:
“gate to source cutoff voltage” Where it says 4V MAX, does ...
0
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0answers
28 views
What causes a distortion in the output characteristic at low Vds?
Attached are the output characteristics of two different LDMOS transistors, extracted from TCAD simulation, where Vgs = 3.3V.
The output conductance clarifies the distortion more.
What are the causes ...
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0answers
56 views
MOSFET as a switch: operation region during Rise time
In the below picture, during the time period Tri the drain current Id starts increasing linearly wrt gate voltage Vgs and the voltage Vds is clamped to Vd since the drain current hasn't yet taken up ...
0
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0answers
40 views
What will happen if a MOSFET switch circuit is run without the source?
I have a situation where I have to supply the power to the MOSFET gate drive circuit permanently even when the main switch for source battery is turned off. It is because of the fact that the drive ...
0
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0answers
34 views
Controlling DC motor by MOSFET
I am trying to control the speed of a DC motor speed by varying Vds and keeping Vgs constant at 9volts by potentiometer, but I am not getting appropriate and smooth control of the DC motor this way. ...
0
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1answer
114 views
What is the difference between an inverting and non-inverting MOSFET Driver?
I'm looking for a High Side MOSFET Driver (have the MIC5014/15 in mind) to drive an N-Channel MOSFET, and I noticed that this IC had a Inverting and Non-Inverting variant. What is the difference ...
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0answers
60 views
Getting More Power out of an H-Bridge
tl;dr: how to design an h-bridge to give more power to motors. pre-fab circuits are not an option.
Hi, so for my electronics class we have to build robots from scratch. So no pre-fab circuits (with ...
0
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4answers
202 views
What is the general criterion for selecting a MOSFET voltage and current rating?
I've used an N-Channel MOSFET (IRF540) rated at 100V 28A as a switch with a 54V load and current source that maxes out at 20A. The switch worked however, using the load for a while resulted in MOSFET ...
0
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0answers
170 views
Why does MOSFET get damaged when used as a switch in a RF remote control circuit?
simulate this circuit – Schematic created using CircuitLab
Update: The MOSFET gets damaged when not running the motor even once. Maybe even without connecting the motor at all. There is an alarm ...
0
votes
1answer
78 views
N-channel mosfet turn constantly on after a while
Hi;
N-channel mosfet (Q4) work fine for couple of time and suddenly turn on constantly.
I changed Q4 multiple of times and each time it work for couple of time and suddenly turn on constantly.
the ...
0
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1answer
77 views
How to connect low power components to high power component?
I have a fairly standard circuit: I am controlling a 12V starter motor + 12V car battery with an Arduino PWM signal. I have an array of 4 MOSFET's to connect the low power circuit (Arduino) to the ...
