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Mosfet Push Pull

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34 Threads found on edaboard.com: Mosfet Push Pull
To understand about saturation effects, we should know the core type and flux in regular operation. A push-pull transformer without any clamping or snubber might drive the mosfet into avalanche breakdown in regular operation. Inrush current during output capacitor charging will cause respectively higher avalanche energy which might be (...)
BJT are fast if not driven into saturation. In addition mosfet gate driver must provide low impedance push-pull operation, particularly fast gate discharge. That's impossible with your single transistor high side driver circuit. Just helpless.
A common drain mosfet is a source-follower. It has no voltage gain and is extremely difficult to bias because if you make it push-pull the N-channel needs a fairly high input voltage and the P-channel needs a fairly low input voltage. A CD4007 or a CD4069 cannot be made to do what you want and if you use separate mosfets it (...)
An open drain is the drain of a mosfet that has an external load. Then more than one mosfet drain can be connected to a single load. If all mosfets are turned off then one mosfet can control the load. A push-pull output has two transistors, one of them pushes low and the (...)
With "snubber" you mean a diode parallel to mosfet drain-source? It doesn't serve a purpose in a flyback circuit ("single mosfet driving a transformer").
Hello dear edaboard members ; I'm really tired of getting the same error from proteus :( I have 48 to 12 V dc-dc converter pre-design(not completed to apply in real life) with UC2525 PWM regulator chip. My problem is when i am trying to drive to mosfet gates(IRFZ44N) PWM-A(pin-11) is nearly correct but PWM-B(pin-14) is about to gnd.(some 1V peak
Need a Heavy Duty Buck Converter with Negative Common. Conditions and Ratings: Input: 18 ~ 30V DC Output: 12.5V / 10A Continuous. Run time: 24hrs at 10A. Cooling system: None / Air Cooling. Input and Output Ground is common. N-Channel mosfet. This was the conditions. I tried with push-pull type, Single Inductor Buck (...)
At least this problems: - RCD not working (wrong D4 polarity) - very slow mosfet turn-off due to bad gate driver circuit. Should use push-pull transistor buffer. It's also unclear if the transformer has right winding polarity for flyback operation.
I have two identical diagrams here with the placement of the drain/source diode and RC snuber filter, the only difference. I like presenting my question with a diagram because it makes the question a visual subject. These diagrams are for reference purposes only. When I using a switch module, mosfet/IGBT, because they are a kind of single device
Your circuit has several issues. Worst of all, 35 V gate voltage will immediately kill the mosfet. You need a voltage limiting means for the gate voltage. Secondly, the relative large load resistor R1 will only slowly discharge the gate capacitance. For fast switching a lower resistance or preferably a push-pull driver circuit is (...)
hello dear forum I want to add snubber to my mosfet H bridge the DC link voltage is 300 VDC and the H bridge circuit works as inverter producing 30 - 100 Hz alternating square wave the values of components is not true I will use 100 nF and 1 K and UF4007 I want to ask if the following scheme is correct ? thank you [ATTACH=CONFI
Once a mosfet is switched on, it will not switch off again even if the voltage is removed, because the parasitic capacitance between gate and source (1nF to 5nF typical) will store charge and will maintain the gate-source voltage even when the signal is removed. To remove this charge quickly, a resistor is required in parallel with this capacitor.
You didn't yet mention 8051. It has open drain outputs with weak pull-ups instead of regular push-pull outputs. As a simple solution, you can place strong (e.g. 1k) pull-ups. If you also want safe reset behaviour, an inverting driver (like 74HC04) between 8051 and mosfet is suggested.
Since the two transistors in a push-pull amplifier are in series the current through both will be the same as long as the output is set to 0V output bias (or the output is capacitively coupled). The mosfet resistance to current flow is determined by the gate to source bias voltage on each transistor.
I'm try to run mosfet with high frequency..30 khz..10 duty cycle. i got turn off switching in mickro second but when i read data sheet is about nano second. Is it normal?, or is anybody have idea to reduce this turn off switching90037
Use L293D motor driver IC. U can directly give MCU output as input to this and it will drive the motor. U can also use this in push pull mode, configure it as H-Bridge driver. 88138 On the other hand, u can use power mosfet in H bridge configuration for motor on off. And also can provide PWM to mosfets to control the speed
In a DC link inverter, the first stage is a boost stage - designed using a push-pull or full-bridge converter and a ferrite transformer - not a mosfet-inductor based boost converter. So, the boost stage is necessary, unless you're going to use a bulky 50Hz transformer - but in that case, you shouldn't even bother with a second full-bridge (...)
there a way to protect the mosfets from saturating using resistors or capacitors? Due you are under development stage, I suppose you are using a DC regulated power supply, with limit current protection, wright ? Thatīs the standard procedure, and if the case, there is no need to do that you are asking.
Concerning power mosfets encapsulated in pack case, assemblable w/ screw, can be interconnectable w/ stack metalic plates, properly isolated. It makes easier build the power stage, and also restrict current flow into a confined region. I saw this concept with a pack IGBT set on a 5KW UPS based on push-pull topology, allowing a very (...)
You can measure the primary leakage inductances on your push pull transformer, you can assume the dominant cap will be the mosfet, use a snubber cap 5-10x this value. calculate R from 0.5 x SQRT(L/C), if you have very high leakage and/or reflected energy from the secondary there are other ways to work out the RC based on Ipk at (...)