I am using a circuit shown below. it is designed to sense 1.5 A whenever the load takes current >= 1.5 A. Rsen senses the related voltage and activates the transistor. Here I use a Rsen = 0.46 R(0.7V/1.5A).
Whenever 1.5 A flows the BC547 turns ON and the gate of MOSFET gets turned off (Vgs less than Vth).
But our problem is source of MOSFET provide a voltage and MOSFET getting over heated.
Can someone provide a solution for this?