Search Engine

Mosfet Npn Transistor

Add Question

37 Threads found on Mosfet Npn Transistor
You can also connect another resistor (say 10kΩ) in series with the collector of the npn transistor. That will limit the zener current. The disadvantage is that it will also give an RC slow down of the mosfet turn-on, depending upon its gate charge and the resistor value.
@The Electrician, where can I find that method that you have used to solve the circuit, besides the link that you've posted? A book for example. Why are you using re? Is the re in your expression equal to my rpi? @Audioguru, why is that the gnd has to be a negative voltage source? Is this only because it's a diff. pair with BJT? For example for M
Hi all, i am trying to light up an LED using a npn mosfet. my circuit is something like... LED(+) is connected to BATTERY 5v(+) LED(-) is connected to mosfet source. mosfet drain is connected to BATTERY5v (-). mosfet gate is kept floating initially, but then too my LED lights up. i connected my (...)
You are not using a PNP transistor, it is an npn. Your mosfet is shown connected upside down. Its diode is conducting all the time because you have its drain at the positive supply. A P-channel mosfet has the positive supply on its source and the load to ground on its drain.
by calling it N channel do you mean its basically a IGBT equivalent of a npn bipolar transistor, except that instead of a gate that conducts it has a isolated mosfet like gate(whatever the IGBT inner structure was) ? Not quite. it is equivalent to an n-Ch gate driving the base of a PNP. so think of it as a quasi
No, you will have to use another mosfet/npn transistor.
Also show the part number of the transistor so we can see if its pins are EBC North American, CBE European or ECB Asian, and so we can see if it is an npn. a PNP, a Jfet or a mosfet. The output current from the 555 can be as high as 200mA. If you connect it directly to the base of an npn transistor that (...)
There is a different class of transistor switch with ultralow Vce and Rce with higher hFE and gain at saturation. I wont get into the epitaxial differences but instead of 10:1 Ic:Ib specs for switch operation they are 50:1 and usually specialized by Diodes Inc and some others. They also class the devices for npn with Rce like mosfets
2SK623 is in a TO247 package 20A mosfet. But the TO92 transistor looks more like a npn transistor S8050 and the complement is S8550. See datasheet have redrawn the schematic as attache
With a +12.0V supply and a 200mA load some 555 ICs have a maximum output voltage of +9.5V as listed on its datasheet. If you add a high current P-channel mosfet then the output will be close to +12.0V with plenty of Amps. Very correct, while using mosfet you need to wire two transistor (one npn & one PNP) in a "tote
Yes, the voltage gain of the mosfet adds to the loop gain then the loop becomes unstable and causes oscillation.
2N7000 is a Nmosfet while the replacements you list are npn transistors. See if helps
looking in your LL110 datasheet, it shows Vgs = 5V. If your microcontroller output is +5v, then only it switches the mosfet compelety ON. So i recommend you to use a npn transistor and mosfet to power up the fan. connect output from uC pin to base of npn transistor with a series resistor, (...)
Hello, Sorry if this topic was covered already. I need a transistor (preferentially an npn) for an current source generator. It seems that on the datasheets such VA doesn't appear. Is there a way to calculate it from the other parameters? I have to choose a npn for a current source with the output impedance in the range of 100 Mohm. For
use uc3844 & mosfet based smps it is constant current & voltage controlled
You can have complementary dual transistors (two chips in package) like BC846PN or BC817UPN. transistor arrays with dual polarity (classical part CA3096) are still manufactured for special purpose, but I doubt that they are suitable for your application. Complementary mosfet pairs in a package are quire common.
Even if you got the transistor biassing correct, the 1N4007 is not suitable for high frequency rectification, you need a device with faster switching speed. At first glance, if all you are trying to do is create -18V, why not use an npn transistor (or better still a mosfet) , the same positive rail for the output stage as (...)
Hi, All the answer is referring to SWITCH operation ONLY, transistor and mosfet can operate other means too. transistor Base current will go to Emitter (npn) when used as switch, in mosfet Gate current will not flow into Drain. In Opto-isolator, you will drive the LED part which will drive the (...)
how to choose "PNP-npn" mosfet transistors, which operates more than 13.56 MHz and around 3 amp? what is the right way to look for a transistor with such specific values?
What I use is invert the G-S arrow , then I read it as a transistor , if the inverted arrow direction is like a npn then it is a N-mosfet , if the inverted arrow direction is like a PNP then it is a P-mosfet. You can also treat that inverted arrow as a diode to figure if the gate should have a lower voltage compared to the (...)
In this instance it?s better to use PNP (or P-channel mosfet), as all what you need to do is pull the base (or Gate) down to GND via a resistor .. If you use npn transistor (I don?t know why you have mixed Source and Emitter ? these are pins of two different types of transistors) then you have to ensure that the Base is at (...)
If you don't want to face issues while driving a switch from a 3.3V logic consider an inverter based on an npn (or N-channel mosfet) followed by P-channel mosfet (or PNP) working as a high-side switch .. See fig.3 at: IanP :wink:
You have to describe your situation and application in detail. Is it the DC pulse or impulse. Level of the DC? pulse width? The basics would be to turn on a npn transistor and use this transistor to turn on POWER mosfetS, if you need more power add multiple mosfetets in parallel. you can see a simple (...)
Hi You can use any pin who can act as I/O You can't drive relay directly - you will need to use some driver - npn or mosfet transistor All the best Bobi
Hi all, I am implementing a way to protect my recharger output against reverse battery polarity connection. I am using a P-mosfet (low Rds on ON state) and a TIP31C (or any other npn) as its driver, the way that is shown do you think about it ? Do you think it could really work ?
dr. sir i want to create op-amp based firing circuit for mosfet. so plz do the needful for this.. awaiting for reply regards nirav suthar
I scanned in this schematic for you to try. In your schematic you use two P-Channel mosfet, the complementary action is achieved by means the npn transistor Q3, just to point because into the previous reply you said use two mosfet P&N instead here is two P mosfet. Thanks. Bye Pow I think yo
A logic level mosfet with sufficient low Ron will have lower voltage drop than darlington transistor.
A npn transistor with a suitable base resistance should do for a low power motor, if you want to control its current directly with a TTL level PWM signal. I don't see any advantage of a mosfet over a BJT in this kind of application. Another (and more expensive) approach would be using a driver IC. Regards
the way you have biased the circuit is right only also the mosfet is stable even through temperature changes.... i think you have to be careful in the selection of resistors and caps to be used....
i would used P-mosfet and N-mosfet rather transistor for driving motor IRFZ44 would and it's complementary will enough to drive your motor regards
Hi, I need a linear negative power supply that uses a npn or N-Channel power mosfet transistor as power regulator and TL431 as voltage reference and active voltage comparator. Regards, Fernando
Hi all, Im getting a little bit confused as to which mosfet I need. I want it to act with the same 'turn' on characteristics as an npn Bi-polar transistor. E.G High resistance when no voltage is applied to the gate and then a low resistance when a positive voltage is applied to the gate I thought the correct (...)
What it does, it creates a higher voltage at the collector of the npn transistor than the Vdrive voltage. This ensures thet the Gate of the mosfet, drives it completely on so its on-resistance is the lower and hence the waste in heat produced in the mosfet is the minimum. Usually the function of Bootstrap is to increase (...)
Hi, we're currently designing a servo controller for these motors that we've started getting made up . The idea is to make a 'servo beater' for robotics applications, retailing at $15 - $20. Basic specs to include a variety of gearboxes (and nominal RPM outputs 40 ~ 250RPM), quadra
Hi fellows !!!! I need som help bout using mosfet in place of BJT in DC - AC Invertors / UPS Currently am using D313, 2N3055 & som other npn power transistors with 2.5Vbe I tried to use IRFP260 the same way but its not even conducting kindly help me out if it has any different way of operating or any important / basic point. Waiting for a (...)
mosfet is a transistor technology. It is an extention of the field-effect transistor (FET). As with bipolar transistor, where you have npn and PNP, you can have two kind of FET (P-channel and N-channel). When creating integrated circuits, using mainly P-channel mosfet (...)