Protection circuit

Abstract

A protection circuit (P) for protecting a load (L) against overcurrents, and including input terminals (lN1,lN2) to be coupled to first and second power supply terminals of a power supply, output terminals (OUT1, OUT2) to be coupled to respective terminals of said load (L) , a first active device (T2) having a control electrode and a conductive controlled path coupled between said first input terminal (lN1) and said first output terminal (OUT1), a charging circuit (l,C1,R4) for turning on said active device upon coupling said power supply to said input terminals (lN1,lN2), a current limiting circuit (R2,T1) for limiting the current through said conductive path of said active device (T2) at a current limit value (llimit), and a fuse (F1) coupled in series via said first input terminal with said conductive controlled path of said active device (T2), is characterised in that said current limiting circuit (R2,T1) includes regulating means (R1,C3,R3) for dynamically regulating said current limit (llimit) value through said active device (T2) thereby further regulating the time to the blowing of said fuse (F1).

Dependencies are inferred from the claim text.