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34 Threads found on Push Pull Mosfet
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.
Hi everyone, I would like someone of you give a suggestion about the problem i have to build an electronic circuit. (1)I want to build apush-pull amplifier (which is not THE LOGIC INVERTER but is an amplifier) made in CMOS by using the CD4007ub (2)I made the following connection to try : 127948 and it work. But th
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 (...)
You have been talking about flyback topology. Please clarify the circuit. Is it actually push-pull?
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.
Do you mean that the external diode is not needed? Yes, very clearly. In addition, you can ask if the diode is needed at all. But that's a theoretical question because it's present in any mosfet. The dominant problem of the transformer push-pull converter is overvoltage after switch-off, caused by the transformer leakage inductan
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 (...)
As a first point, it's a completely bad idea to use RCD snubbers for H-bridges, whatever the R and C values are. They are good for single ended or transformer push-pull output stages. In H-bridges, theř cause high peak currents and additional switching losses. Secondly, the ringing is produced by free-wheeling the H-bridge, as already pointed ou
I guess the OP is asking of additional gate-source resistors used with push-pull gate drivers, as suggested by some publications. If so, no RC time constant calculation applies. The gate will be driven most of the time by a low impedance driver, the resistor would be only effective during rising or falling supply voltage in a small voltage range
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.
Turn off time is raised by load capacitance and open circuit impedance. In order to lower Toff, you need an active load or push pull CMOS driver or half bridge type circuit or a narrow pulse on a very low RLoad. Read specs for test conditions where tOFF applies. VGS = 10 V, ID= 40 A Rise time tr ? 300 ? ns Turn-off delay time td(off) ? 5
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 (...)
electro13, You must inform what circuit topology is used ( push-pull / Full-Bridge / etc... ). +++
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 (...)