公开(公告)号：JPH03180918A

公开(公告)日：1991-08-06

申请号：JP30230590

申请日：1990-11-06

Applicant: MARELLI AUTRONICA

Inventor： BUARERIO JIYORUJIETSUTA ,  IBESU REGURANDO ,  FURANKO SARERUNO ,  JIYANRUIJII MORETSURO

IPC: G06F3/00 ,  H03K17/082

Abstract: PURPOSE: To prevent the damage of a transistor TR by permanently disabling the TR concerned with a control part, which detects short-circuit, in the case of repeated occurrence of short-circuit in a load. CONSTITUTION: When a short-circuit state occurs between the drain of a TR Mi and the positive pole of a power source VBD, a diagnostic logic circuit 13 detects this state and applies a disable signal to a control circuit 12 for a temporary stop period. If a short-circuit state between the drain of the TR Mi and the positive pole of the power source VBD is detected again after this period, a first breakdown signal is outputted, and the disable signal is permanently applied to the control circuit 12. A driver circuit 12 is stopped finally in this manner, and then, the signal of a terminal CMD1 is returned to level '0' and is kept in this level. Thus, stress of the TR M1 is eliminated to prevent the damage of the TR M1.