Questions tagged [powermosfet]

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Designing MOSFET bridge rectifiers for high voltages

I've been looking into MOSFET bridge rectifiers, also known as "zero IQ" rectifiers, as a replacement for traditional diode-based bridge rectifiers. Here's a simple example: The benefit, of course, ...
3
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1answer
92 views

Help identifying this MOSFET

Trying to figure out what this is, and suitable replacements. Markings are "1 Wt 77" Cannot seem to find anything. Edit: I removed and sized it today, looks like 2.04 mm square package, ...
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2answers
274 views

H Bridge runs for few minutes and MOSFETS start smoking

I have created an H bridge as shown in the schematic below. PWM signal to the MOSFET driver is given by a microcontroller running on 5V. The MOSFETS are screwed to heat sinks. To control the motor ...
2
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0answers
600 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 ...
2
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0answers
260 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 ...
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0answers
51 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 ...
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0answers
31 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 ...
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0answers
42 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 ...
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0answers
61 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 ...
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0answers
79 views

How to calculate snubber for switched inductor?

I'm driving inductive load with PWM and my MOSFET can not handle hard switching without reduce dv/dt ramp between drain-source. So I need to add RDC (resistor-diode-capacitor) snubber, but I don't ...
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0answers
52 views

Calculating MOSFET gate current with \$Q_\text{total} = I_\text{gate} \cdot t\$

Hi I am using the MOSFET IRFP4368. I want to use the equation $$ Q_\text{total} = I_\text{gate} \cdot t $$ to calculate the required gate current of my MOSFET driver. I have my total \$Q_\text{total}...
1
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1answer
115 views

Need help understanding the mosfet trailing edge Dimming

I am working on a circuit to control AC loads up-to 1.5KW by using Mosfets(FCHD125N65S3R0-F155) Circuit is I have few concerns The current is flowing through the body diode of Q2 for positive half ...
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3answers
83 views

what is causing this ring effect on my MOSFET testing circuit and how would I be able to calculate the MOSFET power losses?

So I have the following circuit This is the data sheet for the MOSFET enter link description here Using equations, I worked out what my Rgate to be 2.36 ohms. where Rtest was a 470ohm ceramic block ...
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1answer
157 views

Can someone explain this high-speed P-channel MOSFET drive circuitry?

I found this circuit in an application note on P-Channel Power MOSFETS. The note explains that modern technology has made it possible for P-Channel MOSFETS to approach N-Channel performance in power ...
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0answers
328 views

MOSFET activates every time when ESP32 is restarted

I am using ESP32 (GPIO-13) and RFP30N06LE to control my load (Motor). Everything works fine until i restart/reset the board, Motor starts irrespective of state (ON/OFF). I tried adding pull-down but ...
1
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1answer
81 views

Power Mosfet Information Mismatch: On Region Characteristics vs Total Charge Graphs

I'm dealing with Power N-Chanel Mosfets and, while looking at the data sheet of several units, I noticed that the information about the On-Region (\$ I_{D}\$ vs \$ V_{DS}\$) and the Gate Charge (\$ V_{...
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1answer
68 views

MOSFET switching seeing unneccessary pulse during Power ON

We have a MOSFET switching circuit to switch secondary(battery 5V) supply to load if power lost on primary(12V). Circuit works fine currently. But i am seeing a LOW pulse on highlighted red net in ...
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0answers
474 views

Electronic load for negative voltage PSU

I am making a MOSFET based electronic load to test my PSU rails. Below is a simplified version of my circuit with V2 as the PSU that is being tested. I want to be able to test negative voltage rails ...
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0answers
76 views

Rise time and fall time issue in the power MOSFET

In our automated design due to MOSFET obsolete we have changed new MOSFET which gives us rise and fall time issue at the frequency applied from 10Khz to 500Khz. when we use the power MOSFET as Load ...
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0answers
968 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 ...
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0answers
23 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 ...
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1answer
69 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 ...
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 ...
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0answers
30 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/...
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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
96 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 ...
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0answers
31 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....
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48 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
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
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42 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 ...
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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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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 ...
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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 ...
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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 ...
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0answers
67 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 ...
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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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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 ...
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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 ...
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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. ...
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0answers
172 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 ...
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1answer
78 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 ...
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36 views

What is wrong with I_drain?

After adding an inductive load at the switching node of the half bridge circuit, the drain current keeps increasing. Why is this so? What have I done wrong in the circuit? I first tried to put L,C,R ...
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57 views

BMS won't output voltage despite good LiPo Cells

I have an 20 cell LiPo battery pack that is healthy at 80V in total, the BMS uses 12 MOSFETs in parallel to switch the negative terminal and they all seem healthy but won't switch on, so I can't get a ...
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0answers
22 views

Vgs for MOSFETs in BLDC circuits

I'm confused about how N-channel MOSFETs operate in BLDC circuits. Say we had MOSFETs that are being driven with Vg = 10V, and DC+ is 36V. Say we have Q1 and Q4 on at some instance (Through phase A ...
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178 views

Replacement for fnk3070pa

I have a JR1738RX-12V remote control system in my child 4WD car. We noticed that it's too slow/weak so we decided to put 4xRS-570 motors to give it more juice but they are 65W compared 45W from ...
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0answers
60 views

How to increase Vdss of power MOSFET?

I want to build a Tesla coil with mains voltage. I found a schematic online but it uses an irfp460n MOSFET which can handle 500v (Vdss) but I only have couple of irfp260n and irf250n MOSFETs with 200v ...
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0answers
41 views

Robotics Dual Battery System

Background: I'm designing a general purpose robotics controller. The controller is split into two boards, a power board, and a computation / data handling board. The controller is intended to be ...
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1answer
70 views

Verifiying what Vgs means

I am looking for a MOSFET that is capable of dealing of a max pulsing voltage of 60A(between drain and source) and came across these 2 MOSFETS https://www.onsemi.com/pub/Collateral/NDPL070N10B-D.PDF ...
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1answer
54 views

How to identify duplicate vs original FETs

I am really confused about this topic. Wheather it's ok to use duplicate MOSFETs or not. Say for example my application requires to handle upto 20 amperes of motor current. Is it ok to use 100A or ...
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87 views

Can anyone help with designing a MOSFET load switch

Can anyone help me design a load switch using the Infeneon IPP120P04P4L p channel MOSFET and the necessary filter components? I would like to use the Texas Instruments ULN2803A darlington driver to ...