View l6203 datasheet:

APPLICATION NOTE SHORT CIRCUIT PROTECTION ON L6203 By G. SCROCCHI and G. FUSAROLI With devices like L6203 used as driver often inter- To avoid this risk can be useful to add a circuitry to facing the external world by means of wires, can be protect the device : in this case, to have a total pro- easy to have short circuits. tection, we must consider three types of short cir- cuit : A short circuit can occur for many reasons : a short on the load, a mistake during the connection of the 1 - output to output short circuit wires between the device and the load (i.e. L6203 2 - output to supply voltage short circuit driving a motor), anaccidentalshort betweenthewi- 3 - output to ground short circuit res and so on. The first step is to sense the short circuit current. The outputs of