公开(公告)号：DE69025278D1

公开(公告)日：1996-03-21

申请号：DE69025278

申请日：1990-11-22

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： PALARA SERGIO ,  TAGLIAVIA DONATO

IPC: G01R19/165 ,  G01R31/26 ,  G05F3/22 ,  G01R31/02 ,  H03K17/08 ,  H02H3/087

Abstract: The detection circuit of the current in an MOS type power transistor comprises a detection transistor (T2) connected with drain and gate in common to the power transistor (T1) and having characteristics such that the current (I2) flowing through it is equal to a fraction of the current (I1) flowing through power transistor (T1). Downstream from detection transistor (T2) there are arranged means (T6; T13) for comparing a first current (I3) equal to a fraction of the current (I2) flowing through detection transistor (T2) with a second reference current (Ig1) having a pre-set value and to produce a detection signal of the value of the current in power transistor (T1) in relation to the difference between said first current (I3) and the reference current (Ig1).

公开(公告)号：DE69025278T2

公开(公告)日：1996-09-19

申请号：DE69025278

申请日：1990-11-22

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： PALARA SERGIO ,  TAGLIAVIA DONATO

IPC: G01R19/165 ,  G01R31/26 ,  G05F3/22 ,  G01R31/02 ,  H03K17/08 ,  H02H3/087

Abstract: The detection circuit of the current in an MOS type power transistor comprises a detection transistor (T2) connected with drain and gate in common to the power transistor (T1) and having characteristics such that the current (I2) flowing through it is equal to a fraction of the current (I1) flowing through power transistor (T1). Downstream from detection transistor (T2) there are arranged means (T6; T13) for comparing a first current (I3) equal to a fraction of the current (I2) flowing through detection transistor (T2) with a second reference current (Ig1) having a pre-set value and to produce a detection signal of the value of the current in power transistor (T1) in relation to the difference between said first current (I3) and the reference current (Ig1).