公开(公告)号：DE69518977T2

公开(公告)日：2001-03-22

申请号：DE69518977

申请日：1995-06-30

Applicant: ST MICROELECTRONICS SRL

Inventor： MERLO MAURO ,  COCETTA FRANCO ,  MARCHIO FABIO ,  GRASSO MASSIMO ,  MURARI BRUNO

IPC: G05F1/46 ,  G05F3/22 ,  H02J7/14

Abstract: A reference voltage generator having a dual slope temperature characteristic, for use in an automotive alternator voltage regulator, comprises a bandgap circuit (R1,R2,R3,R4) which generates a voltage (A) having a thermal drift coefficient of zero and a voltage (B) having a non-zero thermal drift coefficient. These voltages are applied to a voltage divider (R5,R6) and a voltage-follower type of circuit (OPA1). A unidirectional conduction amplifier circuit (OPA2) has an input terminal connected to an intermediate point (C) on the voltage divider. A second voltage divider (R7,R8) is connected between the output terminals of the voltage-follower circuit (D) and the amplifier circuit (E). An intermediate node (F) of the second voltage divider is coupled to an output terminal (VREF) of the generator.

公开(公告)号：DE69518977D1

公开(公告)日：2000-11-02

申请号：DE69518977

申请日：1995-06-30

Applicant: ST MICROELECTRONICS SRL

Inventor： MERLO MAURO ,  COCETTA FRANCO ,  MARCHIO FABIO ,  GRASSO MASSIMO ,  MURARI BRUNO

IPC: G05F1/46 ,  G05F3/22 ,  H02J7/14

Abstract: A reference voltage generator having a dual slope temperature characteristic, for use in an automotive alternator voltage regulator, comprises a bandgap circuit (R1,R2,R3,R4) which generates a voltage (A) having a thermal drift coefficient of zero and a voltage (B) having a non-zero thermal drift coefficient. These voltages are applied to a voltage divider (R5,R6) and a voltage-follower type of circuit (OPA1). A unidirectional conduction amplifier circuit (OPA2) has an input terminal connected to an intermediate point (C) on the voltage divider. A second voltage divider (R7,R8) is connected between the output terminals of the voltage-follower circuit (D) and the amplifier circuit (E). An intermediate node (F) of the second voltage divider is coupled to an output terminal (VREF) of the generator.

公开(公告)号：DE69629278D1

公开(公告)日：2003-09-04

申请号：DE69629278

申请日：1996-04-30

Applicant: ST MICROELECTRONICS SRL

Inventor： LECCE SERGIO ,  GRASSO MASSIMO ,  ROSSI GIORGIO

IPC: H03K17/082 ,  H03K17/16

Abstract: A circuit (1) for the controlled recycle without oscillation of the discharge current from an inductive load (L) comprises: an active element (T) connected, in series with the inductive load (L), between first and second power supply terminals (Va and Vb), and having a control terminal (DR) to which a driver circuit (C) is connected, and a recycling regulating means (2) connected to a connection node (D) between the active element (T) and the inductive load (L), and sensitive to a voltage threshold (Vmax) at said connection node (D) to generate, depending on attainment of that threshold (Vmax), a power-on signal for application to the control terminal (DR) effective to start up recycling of the discharge current through the active element (T). According to the present invention, the circuit (1) further comprises a control circuit (3) for controlling the voltage oscillation at the connection node (D) at the end of the recycling, which control circuit includes a circuit means (ZR) with a relatively low resistive impedance and being selectively connectable, at least upon the active element (T) being turned off at the end of the recycling, between the connection node (D) between the active element (T) and the inductive load (L) and a node (A) having a substantially zero impedance toward at least one of said first and second power supply terminals (Va and Vb).