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Recent content by elahetal

  1. E

    how to make floating source by using optocoupler

    Hey keith, Thanks for reply, Yea, I meant collector and emitter just a blunder....! I tested more drive current but the result is the same...I want to transfer the input pulse, I do not care about swing and..., just I do it for ground isolation...but the result I see here is inverted input(green...
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    how to make floating source by using optocoupler

    HI IanP, Thanks for your answer, I attach my schematic and the results. I may made a mistake in drawing or understanding your point. please have a look and provide me with your comments. Thanks, Ela
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    how to make floating source by using optocoupler

    Hi IanP, I have a bizarre problem, I get the pulse from drain-source but not from source!! I know it seems strange but I do not know....why!
  4. E

    a problem with my power mosfets/capacitor cahrging

    Hi Keith, Thanks for your help, I really appreciate that. leave aside what I said, I solved that problem about PMOS. Talking about NMOS that You sent me, I can't get those waveforms, I attach the result.
  5. E

    a problem with my power mosfets/capacitor cahrging

    Hi Keith, I simulated the Pmos circuit..that works...the same as your file but the problem is that when I place a parallel mosfet with the capacitor the current is very low.... I got the slope by NMOS as well(practically, not in simulation) but I have the same problem.... I mean when I adjust...
  6. E

    how to make floating source by using optocoupler

    Thanks a lot IanP, For my understanding, can you tell me if the pulse in second part is a floating one with referenced to its GND(GND2)? I have another question, If I want to simulated the my circuit in Spice, do you know how can I apply GND1 and GND2, I mean if spice consider these two GNDs...
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    how to make floating source by using optocoupler

    Hi guys, I have a digital pulse generated by a DAQ and is connected to a pulse generator IC. I need to have a floating voltage so I was thinking about adding an optocoupler after digital pulse or in the output of the IC. Either way, I do not know how to use the optocoupler for this purpose. Do...
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    how to do isolation in spice

    Hi, Thanks for your answers, I have another question, I have a digital pulse generated by a DAQ and want to change it to floating source...I thought about optocoupler(just diode and transitor) but I couldn't succeed in driving...the datasheet has no info....do have any help for me? Thanks, Ela
  9. E

    how to do isolation in spice

    Hi guys, I want to isolate two voltage supplies that I have in spice, I mean I do not want to connect their negative side together( In experiment, easily I do not connect) but what about in spice? I want to use one of the voltage supplies as a floating volatage supply. any idea will be...
  10. E

    a problem with my power mosfets/capacitor cahrging

    Thanks a lot Keith for your help. The problem is that, I have used high-side gate driver to make a floating point but , when the T1 turns off the capacitor charges through the boot strap capacitor instead of discharging through the channel of T2,in addition, again I can not see the...
  11. E

    a problem with my power mosfets/capacitor cahrging

    Thanks a lot Keith, It is made from discrete parts so I can choose my components(MOSFETs and gate driver) individually. What I am looking for is to see the slope when charging the capacitor.In other words, the Mosfet in parallel with capacitor is my DUT and I intend to stimulate its...
  12. E

    a problem with my power mosfets/capacitor cahrging

    Hi keith, No it is NMOS and intended to work in active region(always)....then it would work as a current source.... You believe it should be a Pmos if I want it to work as a current source?
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    a problem with my power mosfets/capacitor cahrging

    Hello Guys, I have some problem and I really appreciate if you have a look at my circuit.Any comments, ideas, solutions,....are really appreciated! I have a circuit like Fig.1 The theory is: The upper MOSFET gate is driven to active region by very short pulse width (not less than 300us) and...
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    Questions about using gate driver IR2110 for driving power mosfet

    Re: Gate Driver IR2110 Thanks for your quick answer. I have another question: If I have a IC driver for low side, how can I use it for high side? suppose that I am working with low voltage high current MOSFETS so I do not have high voltage rails, I mean I drive a half bridge circuit with...
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    Questions about using gate driver IR2110 for driving power mosfet

    hello everybody, I have some trivial questions for you..... Suppose using a gate driver like IR2110 to drive power mosfet: 1)to change the VGS, I have to change Vcc? If yes, can I use different Vcc for drive HO and LO independantly? 2)In datasheet, it has mentioned the IR2110 is used to...
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