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：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.