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:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    5 tubes QRP SSB Transceiver for 20m ham band
    DC to DC converter electronic schematic
    Miniature-wideband-amplifier
    Circuit Reads Encoder Direction of Movement
    bugbot
    autonomous car
    port jtag cable buffered
    Home-Built Nitrogen (N2) Laser
    Data Receiver
    Elderly lost alarm circuit
    Battery status indicator circuit diagram



    Top