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  1. #21
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    Re: Require a Desgin of A MOSFET based Switch , for study purpose .

    Quote Originally Posted by FvM View Post
    You are still missing a basic understanding of MOSFET operation.

    To get a better idea, you can use the post #9 simulation circuit and perform a dc sweep as shown below. Determine for which Id and Vds range the transistor is in cutoff, saturation and ohmic mode. You'll find that a transistor switch is only temporarily in saturation, you want to avoid this operation due to high power dissipation.

    Attachment 157373
    Sir,
    Now cleared the doubts learned charactrestics lot of . And I Concluded that the desgin as follows .

    VDD =12Volt
    Vgs = 5volt (at maximum current 1.69ampere when the ohmic region then the Vgs volt is 2.9v . there2.1volt drops)
    Vds@ON =Vout = 145mv.
    Click image for larger version. 

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  2. #22
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    Re: Require a Desgin of A MOSFET based Switch , for study purpose .

    Your Mosfet has no part number for you to see its datasheet.
    A Mosfet part number has a range of on-resistance at a Vgs of 10V for most of them or a Vgs of 4.5V for a "logic-level" one. Therefore some Mosfets are more sensitive than others.
    You will need to buy many Mosfets with the same part number to maybe find one that works like you show.



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