Fet for turning on high voltage.


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  1. #6
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    Default Re: Fet for turning on high voltage.

    I think this is what you want.

    Maybe you have to check the values of R6, R7 to ensure Vgs of the P-Mosfet is within safe limits.

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    Also you can replace the N-Mosfet with a BC337 and a 1K base resistor. But I think the proposed schematic is more elegant and fast without gate resistor (direct PIC connection). The P-Mosfet for my application is low Rds and much more Amperes than what you need. So, maybe, you have to choose another one.

    My selection on R6, R7 was with speed to consumption priority and with these values they should be at least 1/2W. If you can live with smaller speed, or you only need ON/OFF case, then select higher values, but always make sure you give P-Mosfet gate the correct voltage levels.

    Ioannis
    Last edited by Ioannis; - 18th October 2012 at 19:13.

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