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Triggering a mosfet with Proteus

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pabloncho , did you see AG's post?

The load is only 1 ohm and the Mosfet is an old one. When the Mosfet switches then the voltage boost will not be much.

At least change the load resistance.
 
Try giving your voltage source that drives the gate a finite resistance (say 1Ω), or include a low value resistor in series with the gate.
boost 1.2V - 5V to 12Vout, 100W out
That may work in a sim, but is likely to cook a 1.2V battery in practice ;).
 
If you need to run from as low as 1.2V, then you need a mosfet that can switch with such low gate voltage, and there arent many and even less with high enough current, so bjt might be a better choice here.
 
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