MOSFET current sensing


Posted on Jul 15, 2012

The circuit shows the method of `mirror` current sensing a MOSFET. A fully conducting MOSFET is resistive and behaves exactly as a resistor. It therefore you limit the voltage across the MOSFET when it is conducting you automatically limit the current flowing through it. In addition the MOSFET``s on resistance has a positive temperature coefficient so as it warms up, keeping the voltage across it limited will automatically reduce the limited current flowing through it, keeping it within its safe region over a wide range of junction temperatures.


MOSFET current sensing
Click here to download the full size of the above Circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

AM receiver
Two-Door Annunciator
Alarm Digital Clock Schematic Diagram
Electronic thermometer
Generating Electro-Gravitic (EG) Forces
W7800 by the application circuit composed of power supply tracking
Combustible gas alarm circuit



Top