公开(公告)号：JPH08272470A

公开(公告)日：1996-10-18

申请号：JP6881596

申请日：1996-03-25

Applicant: CONS RIC MICROELETTRONICA ,  SGS THOMSON MICROELECTRONICS

Inventor： ROBERUTO GARIBORUDEI ,  FURANCHIESUKO PURUBUIRENTEI

IPC: G01R19/165 ,  G05F1/46 ,  G05F3/26 ,  G05F3/28 ,  G05F3/30 ,  G11C5/14 ,  H02J1/00

Abstract: PROBLEM TO BE SOLVED: To provide a circuit for generating a reference voltage and simultaneously detecting the drop of a power supply voltage. SOLUTION: In this circuit for generating the reference voltage and detecting the drop of the power supply voltage provided with at least one piece of a threshold value comparator 12 provided with an input terminal IN and an output terminal and a voltage divider 14 connected between a first power supply voltage reference VS and a second voltage reference GND and connected to the input terminal IN of the comparator 12, further, the output terminal OUT of the comparator 12 is connected to the input terminal IN through at least one piece of a feedback network provided with at least one piece of a current generator CG1. The feedback network is further provided with a buffer block 13 provided with the input terminal. connected to the comparator 12 and a first output terminal DO connected to a switch SW and the switch SW is connected between the circuit node X2 of the voltage divider 14 and the second voltage reference GND.

公开(公告)号：JPH0969760A

公开(公告)日：1997-03-11

申请号：JP7435096

申请日：1996-03-28

Applicant: CONS RIC MICROELETTRONICA ,  SGS THOMSON MICROELECTRONICS

Inventor： FURANCHIESUKO PURUBUIRENTEI ,  RITSUKARUDO URUSHIINO ,  ROBERUTO GARIBORUDEI

IPC: H03F3/45 ,  H03K3/011 ,  H03K3/0231 ,  H03K3/354 ,  H03K4/06 ,  H03K19/0948

Abstract: PROBLEM TO BE SOLVED: To provide an oscillation circuit generating an oscillation electric signal which is not easily affected by supply voltage and a temperature. SOLUTION: A capacitor C, a charge circuit CCA and a control circuit CCO are provided. The charge circuit CCA contains a first current generation device GEN1 and a second current generation device GEN2, which have first and second current values and respectively opposite directions, and switch means SW1 and SW2 designed in such a way that the generation devices GEN1 and GEN2 are connected to the capacitor C. The control circuit CCO has voltage input connected to the capacitor C and output connected to the control inputs of the switch means SW1 and SW2 and contains a comparator containing a hysteresis having a lower-side threshold and an upper-side threshold.

公开(公告)号：JPH08279737A

公开(公告)日：1996-10-22

申请号：JP29860695

申请日：1995-11-16

Applicant: CONS RIC MICROELETTRONICA ,  SGS THOMSON MICROELECTRONICS

Inventor： PAORO KORETSUTEI ,  GUREGORIO BONTENPO ,  FURANCHIESUKO PURUBUIRENTEI ,  ROBERUTO GARIBORUDEI

IPC: H01L27/04 ,  G05F1/573 ,  H01L21/822 ,  H01L29/78 ,  H02H7/00 ,  H03K17/08

Abstract: PROBLEM TO BE SOLVED: To provide a simple and correct method for protecting a power transistor(TR). SOLUTION: The method is provided with a process where a 1st electric signal S1 proportional substantially to a current flowing to a path D-S is generated, a process where a 2nd electric signal S2 proportional substantially to a voltage across the path D-S is generated, a process where the 1st signal S1 and the 2nd signal S2 are multiplied to generate an electric generating signal PS, a process where the electric generating signal PS is compared with an electric reference signal RS to generate an electric difference signal DS, and a process where the electric difference signal DS is used to drive a control terminal G so that the electric generating signal PS is smaller than the reference signal RS.

公开(公告)号：JPH07326953A

公开(公告)日：1995-12-12

申请号：JP15230995

申请日：1995-05-25

Applicant: SGS THOMSON MICROELECTRONICS ,  CONS RIC MICROELETTRONICA

Inventor： FURANCHIESUKO PURUBIRENTEI ,  GUREGORIO BONTENPO ,  ROBERUTO GARIBORUDEI

IPC: H03K17/567 ,  H03G1/00 ,  H03K17/00 ,  H03K17/042 ,  H03K17/16 ,  H03K17/687

Abstract: PURPOSE: To optimize power consumption and switching delay by changing the operational condition of an output power transistor(TR) and attaining current absorption in accordance with a current level transmitted by a driving operational amplifier. CONSTITUTION: The driving operational amplifier 15 constituted of a differential input stage consisting of current mirrors 1 to 3 constituting a final stage, a differential TR pair N1 , N2 and a current oscillator IP. The single ends of these mirrors 1 to 3 are directly connected to the gate of the output power TR PW and the current absorption of output currents having the same level on the differential input stage is reduced in accordance with a mirror ratio. An output current from the amplifier is modulated by circuit arrangement consisting of TRs M1 , M2 , P1 to P4 , and an auxiliary current oscillator I while relating to the operation state of the circuit and the TR pair M1 , M2 is cross- coupled with the TR pair N1 , N2 . Thus a current necessary for the charging and discharging the gate node of the TR PW1 is transmitted from the operational amplifier.

公开(公告)号：JPH06343260A

公开(公告)日：1994-12-13

申请号：JP4305994

申请日：1994-02-17

Applicant: SGS THOMSON MICROELECTRONICS ,  CONS RIC MICROELETTRONICA

Inventor： ROBERUTO GARIBORUDEI ,  FURANCHIESUKO PURUBIRENTEI

IPC: G11C11/407 ,  G11C16/06 ,  G11C17/00 ,  H02M3/07

Abstract: PURPOSE: To eliminate a trouble of the conventional charging pump circuit, by replacing a diode with another element so as to prevent a voltage drop caused by the diode. CONSTITUTION: Two charge transfer devices connected in parallel, such as a pair of complementary transistors M5 and M6 as a switch, are connected between a supply node (VCC) and an output node (GND) in a circuit. As a result, a decrease in output voltage equal to a voltage drop caused by a diode in a conventional circuit can be prevented.

公开(公告)号：JPH08107629A

公开(公告)日：1996-04-23

申请号：JP14207495

申请日：1995-06-08

Applicant: CONS RIC MICROELETTRONICA

Inventor： GUREGORIO BONTENPO ,  FURANCHIESUKO PURUBUIRENTEI ,  PAORO KORETSUTEI ,  ROBERUTO GARIBORUDEI

IPC: H02H3/08 ,  H03K17/082 ,  H03K17/284

Abstract: PURPOSE: To independently control on-times and off-times of multiplex independent channels by a method, wherein a generating circuit which generates on times and off-times of integrated switches is connected between the input terminal of a 1st logic gate and the output of an output device. CONSTITUTION: A comparator 5, a logic gate PL1, a driver 6, a DMOS transistor Tr7 and an output terminal S1 are connected in series with the input part 2 of an overload protective device 13. The drain D1 of the transistor Tr7 is inputted to an operational amplifier 9, whose output 03 is fed back to the driver 6. A circuit A which generates on-times and off-times of integrated switches is provided between the output 04 of the amplifier 9 and the logic gate PL1. In the circuit A, the output of a capacitor C1 and a free-running type oscillator 14 is inputted to a logic gate PL2 and the on-times and off-times of respective channels are set by a storage block 16 and a counter block 15. The set on-times and off-times are inputted to the logic gate PL1. With this constitution, an interval between the on-times and off-times can be set for every channel.

公开(公告)号：JPH01128107A

公开(公告)日：1989-05-19

申请号：JP25361188

申请日：1988-10-07

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： ROBERUTO GARIBORUDEI ,  ARUBERUTO GORA

IPC: G05F3/16 ,  G05F1/10 ,  G05F1/56 ,  H01H47/22 ,  H02H9/04 ,  H03K17/082 ,  H03K17/16 ,  H03K17/64

Abstract: PURPOSE: To prevent triggering characteristics from practically depending on the change of a supply voltage and a temperature by connecting a first divider to a power transistor TR, and when an overvoltage crossing the divider exceeds a limit value set in a second divider, selecting two voltage dividers and changing a state of a comparator. CONSTITUTION: To the base of the power TR Qp for driving the induction load L of a switching power converter, a driving stage by the serial circuit of the TR Qd and a resistor R7 and the serial circuit of the TR Qd and the resistor R8 is connected and switching signals are added to the base of the TR Qd. The overvoltage of a transistor crossing the TR Qp is limited by a voltage comparator by the TR Q3 , the TR Q4 , the resistor R9 and a compensation capacitor Cc. The terminal B of the comparator is connected to the intermediate node of the resistors R2 and R3 connected between the emitter and collector of the TR Qp, a voltage V1 is inputted proportionally to the voltage Vc which crosses the TR Qp and a reference voltage VREF corresponding to the preliminary setting fraction of the supply voltage Vcc is added to the other terminal A.

公开(公告)号：JPH08327685A

公开(公告)日：1996-12-13

申请号：JP12208296

申请日：1996-05-16

Applicant: SGS THOMSON MICROELECTRONICS

Inventor： FURANCHIESUKO PURUBIRENTEI ,  ROBERUTO GARIBORUDEI

IPC: G01R19/165 ,  G01R31/02 ,  G05B19/042 ,  G05B19/05

Abstract: PROBLEM TO BE SOLVED: To detect the load current accurately with high sensitivity when the load is open-circuited through simple circuitry while reducing the cost. SOLUTION: The circuit for detecting an open load comprises at least one main transistor M10 connected with a load L, and one auxiliary transistor M11 connected in parallel with the main transistor M10 between a first power supply voltage reference VS and a second voltage reference GND. The method for detecting an open load coffmprises a step for comparing a first voltage value at a terminal connected with the load of main transistor M10 with a second voltage value at a terminal of auxiliary transistor M11.

公开(公告)号：JPH06318854A

公开(公告)日：1994-11-15

申请号：JP780994

申请日：1994-01-27

Applicant: SGS THOMSON MICROELECTRONICS ,  KORIMUME KONSORUTSUIO PERU LA

Inventor： FURANSESUKO PURUBUIRENTEI ,  ROBERUTO GARIBORUDEI

IPC: H03K17/16 ,  H03K17/0412 ,  H03K17/0414 ,  H03K17/687 ,  H03K17/695

Abstract: PURPOSE: To obtain a driving circuit for field effect transistor suitable for being used at an upper stage of a half-bridge configuration, capable of being operated with a high switching rate in which no cross current appears and providing extremely high output impedance. CONSTITUTION: A first transistor M1 is connected between a gate terminal of the field effect transistor MFET1 and an negative pole GND of a voltage supply generator to turn off gate voltage of the MFET1 and the transistor M1 is driven by operational amplifiers connected to the gate terminal, a source terminal respectively by an inverted input terminal, non-inverted input terminal. Each of the MFET1 is connected with other power source M1 by switches S1, S2.