Default on power switch

I want to design an easy power switch that is on by default, but I need the ability to turn the power off.

Is this posible with a few mosfet's?

thanks for any help

Parents
  • hello LucaV and Robert,

    thank you for the answer. I will check this one out. At first look it looks perfect.

    But in my design I have an controller that control this line, and if this line is low I will not have power to the same controller so I can turn it on.

    I am not sure if understand this sentence, and it may look strange. But I have another power source to this controller which is by default off.

    But I can put in one NMOS, then I think it will work.

    Thank you for finding the ADP197 for me

    best regards

    Zpike

Reply
  • hello LucaV and Robert,

    thank you for the answer. I will check this one out. At first look it looks perfect.

    But in my design I have an controller that control this line, and if this line is low I will not have power to the same controller so I can turn it on.

    I am not sure if understand this sentence, and it may look strange. But I have another power source to this controller which is by default off.

    But I can put in one NMOS, then I think it will work.

    Thank you for finding the ADP197 for me

    best regards

    Zpike

Children
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