MOSFET short-circuit protection Schematic Diagram


Posted on Feb 7, 2014

If you have an application in which a MOSFET is already used to switch a load, it is relatively easy to add short-circuit or overload protection. Here we make use of the internal resistance RDS(ON), which produces a voltage drop that depends on the amount of current flowing through the MOSFET. The voltage across the internal resistance can be sens


MOSFET short-circuit protection Schematic Diagram
Click here to download the full size of the above Circuit.

ed using simple comparator or even a transistor, which switches on at a voltage of around 0. 5V. You can thus avoid the use of a sense resistor (shunt), which usually produces an undesirable extra voltage drop. The comparator can be monitored by a microcontroller. In case of an overload, the software can initiate suitable countermeasures (PWM regulation, alarm, emergency stop etc. ). It is also conceivable to connect the comparator output directly to the gate of the MOSFET, in order to immediately cut off the transistor in case of a short circuit.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Ultrasound Detector with 567PLL and LM386 ICs
Noise generator
Interface a uC to PC RS232 with MAX232A
Motor speed control circuits
equivalent circuit of a solid state relay
OWL2c and conductivity
speak spell
Jammer circuit
Convert Digital Mains Timer To Low Voltage
Thyristor overcurrent protection circuit 2
Multiplication circuit in broadband video band used
A simple remote control switch circuit



Top