公开(公告)号：JPH0677741A

公开(公告)日：1994-03-18

申请号：JP14343093

申请日：1993-06-15

Applicant: SGS THOMSON MICROELECTRONICS ,  MARELLI AUTRONICA

Inventor： ARUBERUTO POOMA ,  BANNI PORETSUTO ,  MARUKO MORERI

IPC: H01L27/06 ,  H03F1/52 ,  H03K17/06 ,  H03K17/082

Abstract: PURPOSE: To provide a simple circuit configuration which has excellent frequency stability and performs accurate current control. CONSTITUTION: A resistance (Rs) is in series with a drain-source path of a MOS power transistor (M1). A feed terminal (J) of a mutual conductance operational amplifier (A) is connected to an output part for boosting a voltage or of a charging pump(CP) circuit that can output a voltage higher than a voltage of a power source (Vs) to which the drain of the MOS transistor (M1) is connected. An input part of the amplifier (A) is connected to the resistance (Rs), its output part is connected to a gate of the MOS transistor (M1) and as the result a maximum current flowing to the power transistor (M1) at time of the operation is limited to a value proportional to a reference voltage (VR).

公开(公告)号：JPH02113618A

公开(公告)日：1990-04-25

申请号：JP22637589

申请日：1989-08-31

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： PAORO MENEGORI ,  MARUKO MORERI ,  FURANCHIESUKO TORIKORI

IPC: H03K3/286 ,  H03K3/289 ,  H03K23/00

Abstract: PURPOSE: To reduce an area and power consumption as compared with an existing frequency divider by using a frequency dividing cell for an IC. CONSTITUTION: This frequency dividing cell is provided with power units A1, D4, R9, a pair of control transistors(TRs) Q2, Q3 of which collectors and emitters are cross-connected to each other and a pair of storing TRs Q4, Q5 of which emitters are grounded. The cell is provided also with two diodes D1, D2 oppositely connected in series between respective collectors of the controlling TR pair Q2, Q3 and a command TR Q1 of which base acts as an input pin for the cell. Consequently the circuit can execute an operation similar to that of a circuit formed based on conventional technology and the number of constitutional parts and power consumption can be reduced.

公开(公告)号：JPH0746900A

公开(公告)日：1995-02-14

申请号：JP16624694

申请日：1994-06-25

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： JIYANPIETORO MAJIYOONI ,  MARUKO MORERI

IPC: H02J7/24 ,  H02P9/08 ,  H02P9/30

Abstract: PURPOSE: To provide an output stage which has low power consumption and low turn-on threshold under stable operating conditions and a regulating circuit using it for ensuring the workability of a system, even if a large drop exists in a supply voltage. CONSTITUTION: A control signal C0 is supplied to a bipolar power transistor of a bipolar power transistor NPN and an electric field effect power transistor NCH, only when a supply voltage VS drops below a reference voltage VREF, using a switch SW which is driven by a comparator COMP for comparing the supply voltage VS with the reference voltage VREF.

公开(公告)号：JPH0267818A

公开(公告)日：1990-03-07

申请号：JP18582689

申请日：1989-07-18

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： FUABIO MARUKIO ,  MARUKO MORERI ,  FURANCHIESUKO TORIKORI

IPC: H01L27/06 ,  H01L21/8222 ,  H02P8/12 ,  H03K17/0814 ,  H03K17/16 ,  H03K17/64

Abstract: PURPOSE: To eliminate the need for a large area by using a single power device so as to alternately set a slow re-circulation or a fast re-circulation of a current thereby re-circulating a discharge current of an inductive load. CONSTITUTION: A transistor(TR) is kept to a saturated state with a current source supplying a sufficient current to a base of the re-circulation NPN TR to bring the TR to the saturation while a load desiring slow re-circulation of a discharge current is driven. The condition above is realized by a current oscillator I controlled by a switch S1 and the switch S1 is closed when the load is driven. When a fast re-circulation of a discharge current in an inductor L is desired, the switch S1 is open to cut application of the saturated current I to the base of the recirculation TR. Thus, the discharge current of the inductive load is re-circulated with a single power device. Thus, no large area is required.

公开(公告)号：JPH02201512A

公开(公告)日：1990-08-09

申请号：JP30451989

申请日：1989-11-22

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： MASHIMIRIANO BURANBIRA ,  MARUKO MORERI ,  JIYANPIETORO MATSUGIOONI ,  PAORO MENEGORI

IPC: H01L27/04 ,  G05F3/30 ,  H01L21/822

Abstract: PURPOSE: To easily reduce the temperature dependency of a reference voltage by supplying a variable compensation current to a resistor means as a function of the temperature to bring about a voltage drop having a property practically opposite to the voltage drop in the operation area of a circuit. CONSTITUTION: Three resistors R2a to R2c are provided which are arranged in series and have one side connected to the emitter of a transistor TR Q2 and one terminal of a resistor R1 and have the other side earthed, and an NPN TR QR is included. A collector current IC of the TR QR is introduced to the resistor R2c to compensate the change of a reference voltage VREF. Thus, the temperature dependency of the reference voltage is easily reduced.