公开(公告)号：JPH11355060A

公开(公告)日：1999-12-24

申请号：JP12891199

申请日：1999-05-10

Applicant: ST MICROELECTRONICS SRL

Inventor： CHIOZZI GIORGIO ,  MARCONE BRUNO

IPC: H02H3/24 ,  H03F1/52

Abstract: PROBLEM TO BE SOLVED: To provide a short-circuit protection circuit especially for a power transistor. SOLUTION: A short circuit protection circuit 10 for a power transistor 12 contains a first circuit which is connected to the power transistor in parallel and which is for mirroring the output current of the power transistor and second mirror circuits 13 and 14 which are connected to the fist mirror means 11 in series. The second mirror circuits output current correlated to current mirrored by the first mirror circuit for comparing it with the reference current Iref. The result of comparison decides whether it is necessary to operate the transistor or not. A circuit which is connected in parallel to the power transistor and the first mirror circuit for adjusting the minimum value and the maximum value of the output current of the power transistor as the function of voltage in the transistor, and which detects the drop of voltage on the power transistor can be contained.

公开(公告)号：DE69841936D1

公开(公告)日：2010-11-25

申请号：DE69841936

申请日：1998-05-08

Applicant: ST MICROELECTRONICS SRL

Inventor： CHIOZZI GIORGIO ,  MARCONE BRUNO

IPC: H02H3/24 ,  H03F1/52