All Questions
10
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Transistor failure in multi channel high frequency AC signals
[Intro]
To begin with, I am an undergraduate electrical engineering student working on my senior project. I wanted to make a wireless charging pad like that of Tesla's wireless charging platform and ...
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1
answer
47
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Driving NMOS source with a separate power supply
I am trying to see whether I can turn on 28 V voltage rail from a 5 V input signal using an N-channel MOSFET (NMOS). I am using IRF530N for now which has a threshold voltage of 4 V. I just modeled it ...
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1
answer
119
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How to make a power switch using MOSFETs?
I am stumped on trying to create a circuit that, through an enable of 3.3V will let +18V go to the load or prevent it from doing so. This is my current approach. I know the pullup resistor should not ...
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45
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Inverting MOSFET drive circuit, is my scheme correct? [duplicate]
I am an automotive engineer student, building an inverting MOSFET driver (where a MOSFET drives and controls another MOSFET, Vin low -> Main MOSFET closed, Vin high -> Main MOSFET open).
My ...
1
vote
3
answers
842
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Bootstrapping circuit vs. charge pump for high side switching
I am designing a circuit where I need to do some high side switching to turn on/off the power to a circuit (part of some protection circuitry). This switching is actually very slow and only occurs ...
0
votes
1
answer
172
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N-MOSFET cannot fully turn off when using with voltage divider
I am using an N-channel MOSFET to control 12 V for my voltage divider. The output voltage of the voltage divider is connected to a 24-bit ADC module (ADS1220) for calculating back the resistance of ...
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1
vote
2
answers
945
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Low Power Switching application With N-Mosfet
In my application I need to effectively switch on or off a very small load, around 0.5W to 1W. Also, I need to ensure that power loss is kept to a minimum. The voltage levels of my application will ...
- 391
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votes
4
answers
1k
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high side switch using NMOS
I'd like to dim an ordinary 3-pin PC fan with a 3.3V-PWM at its 12V power supply pin. As I also need to measure the tachometer signal within a 3.3V logic level circuitry I'd like to switch the fan on ...
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votes
2
answers
198
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Mosfet on or off
When do we say that a nMOS or pMOS is "on" or "off"? Are there any voltages across terminals we should be looking for?
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49
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how to fix output voltage of an NMOS switch with changing load characteristic?
In an NMOS low side switch the output voltage at drain depends on the operating point decided from the Id-Vds curve and load line.
According to my understanding, for a low side switch with Vds ...
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