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hi guys
I want to simulate MOSFETs switching behaviour, where I can model the gate source voltage dependence on Parasitic capacitances. Will like to use that to test out bootstrap circuits later.
Any ideas are appreciated.
Thanks
is it a constant load? I am assuming that is why you are saying 1A? R=V/1 so resistance of 5ohms?
if, efficiency is not an issue,
Use a step down transformer, go through a full bridge rectifier, put a filter capacitor across the output of rectifier and you can use a voltage divider or a linear...
Hi guys,
Thanks a bunch.. You are both correct indeed. And, I wasn't too far off the point either. I forwarded my query to international rectifier and this what they answered.
Quoting IRF:
The parameter Rg in the datasheet of the IRFP4004PBF is not the same as the insulation resistance of the...
Yeah I see what you mean, that is if internal gate resistance is in parallel with source capacitance. I am considering a MOSFET model something like the one attached in the picture.
I am considering the log region (on/off) as I am interested in working out the switching losses of MOSFET.
ok yep..I am confused to be honest. I know what you mean. I know more Vgs enhances the channel. While you need charge to fill up the parasitic capacitances to make voltage rise across gate and source!!once charged..no current flows and the higher the Vgs you applied the lower the channel...
If the impedance was so large, then the MOSFET would never turn on? as no charge would flow in to the gate. I am using irf4004pbf and it appears to have 6.8ohms of internal gate impedance, I am confused whether I need to take that in to account to calculate switching losses.
if I have the required capacitor value in hand, how do I work out the required capacitor ripple current rating? really banging my hand against wall on this one.. plz help
How can I find the Miller charge for a MOSFET under drain to source voltages other than testing conditions. This is for a synchronous rectifier MOSFET, clamped at 1.3V.. IRF4004PBF MOSFET
Also, probably a stupid question, but just want to make sure; Does the internal resistance of MOSFET gate...
Hi guys,
I am a bit unclear on maximum allowable current in motors and cables so the question might sound a bit dumb. But any ways here goes;
I know cables can carry more current for short duration due to *thermal mass effect thing*, it takes certain time to bring the cable up to temperature...
Hi guys,
I have a permanent magnet DC motor, for which I have built a simulation model. I am trying to simulate a Go-Kart. Does anyone know how to take wheel slip into account? My kart seems to be accelerating like a rocket!!
G'day fellows,
I am thinking of soldering SMD MOSFETS on a copper bar, since current is about 200A.
How do I go about soldering them to copper bar, problem is bringing the copper temperature up to soldering temperature. Any ideas??
Thanks
so I dont need TVS across MOSFETS since I have free wheeling diodes??
How about the DC bus?? due to lead inductance there will be over voltages on the bus. I can add DC bus caps to reduce that but large dv/dt is not good for caps (high currents).
How do I perform calculations to select the...
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