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公开(公告)号：JPH10304659A
公开(公告)日：1998-11-13
申请号：JP9705098
申请日：1998-04-09
Applicant: ST MICROELECTRONICS SRL
Inventor： ADRAGNA CLAUDIO , GATTAVARI GIUSEPPE , FAGNANI MAURO
Abstract: PROBLEM TO BE SOLVED: To make the output of a DC/DC converter constant by clamping an error amplifier output signal of a control circuit to a voltage proportional to the amplitude of DC signals inversely proportional to the frequency or by giving an offset equal to a voltage difference between a constant voltage and DC signal to a signal occurred in a current sensing resistor. SOLUTION: A sawtooth wave signal generated by an oscillator is detected by a capacitor Cosc of an RC group. A process of generating a DC signal having an amplitude inversely proportional to that frequency, a process of clamping an error amplifier E/A output voltage to a voltage having an amplitude proportional to the amplitude of the DC signal, or a process of off-setting a signal in a current sensing resistor by a voltage, corresponding to the difference between the constant voltage and DC signal is carried out. By doing this, it becomes possible to obtain a method and a compensating circuit which can be easily realized independently of the characteristics of synchronous signal controlling the switching frequency, and can make the output power of a converter constant against the changes in switching frequency.
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公开(公告)号：JPH07183734A
公开(公告)日：1995-07-21
申请号：JP28424294
申请日：1994-10-24
Applicant: ST MICROELECTRONICS SRL
Inventor： FAGNANI MAURO , FERRARIO BRUNO , SANDRI PAOLO
Abstract: PURPOSE: To restrict the output voltage of amplifier by using an external soft start capacitor in small size while maintaining all the charging currents of external soft start capacitance in the order of microampere. CONSTITUTION: A current flowing through a charging diode QG 23 in the mirror circuit of TrQG 23 and 24 is mirrored by the TrQG 24. Through the mirror of Tr pair GQ 21 and 22 complementary for this mirror circuit, a current made proportional to the charging current flowing through the diode QG 23 and decreased suitably by using a suitable mirror ratio is inputted to the base of an output TrQG 19. The partial current mirrored by the base node of TrQG 19 is balanced partially with a charging current generated at a bypass oscillator MG 2. The current balance is achieved by a control loop, and all the charging currents of external soft start capacitor connected to a correspondent dedicated SS pin is maintained within the maximum value in order of 10 μA. Therefore, the voltage of output voltage COMP can be let rise gradually.
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公开(公告)号：WO2004010569A8
公开(公告)日：2005-07-21
申请号：PCT/IT0200478
申请日：2002-07-19
Applicant: ST MICROELECTRONICS SRL , FAGNANI MAURO , PIDUTTI ALBINO , ADRAGNA CLAUDIO
Inventor： FAGNANI MAURO , PIDUTTI ALBINO , ADRAGNA CLAUDIO
CPC classification number: H02M1/36 , H02M3/335 , H02M2001/0006
Abstract: The present invention refers to a starting circuit for switching power supplies (SMPS), to a switching power supply comprising a starting circuit )and an integrated circuit of a switching power supply. In an embodiment thereof the starting circuit (13) for switching power supplies having a first supply voltage (Vin) coming from a first terminal and a second supply voltage (Vcc) coming from a second terminal and a third tenninal (30); said starting circuit comprises: a first current path between said first terminal and said third terminal (30); a second current path between said first tenninal and said second terminal; a third current path between said second terminal and said third terminal (30); a two-way voltage regulator (M3, Dz2, R5, R6) placed along said second current path.
Abstract translation: 本发明涉及用于切换电源（SMPS）的起动电路，包括起动电路的开关电源）和开关电源的集成电路。 在其实施例中，用于切换来自第一端子的第一电源电压（Vin）和来自第二端子和第三端子（30）的第二电源电压（Vcc）的电源的启动电路（13）。 所述启动电路包括：在所述第一端子和所述第三端子之间的第一电流路径; 所述第一终端和所述第二终端之间的第二电流路径; 所述第二端子和所述第三端子之间的第三电流通路; 沿着所述第二电流路径放置的双向电压调节器（M3，Dz2，R5，R6）。
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公开(公告)号：DE69413638D1
公开(公告)日：1998-11-05
申请号：DE69413638
申请日：1994-07-25
Applicant: ST MICROELECTRONICS SRL
Inventor： FAGNANI MAURO , FERRARIO BRUNO , SANDRI PAOLO
Abstract: A circuit for regulating the time of charging of the output node of an amplifier at start up, commonly comprising an external soft-start capacitor charged by a current delivered by a pull-up transistor (QG19) of a push-pull output stage of the amplifier, through a decoupling diode (QG23) that is functionally connected between the output node of the amplifier and an armature of the external soft-start capacitor, is provided with a current mirror feed back circuit capable of mirroring a current function of the charge current of the external soft-start capacitor on the driving node of the pull-up transistor (QG19) of the output stage of the amplifier. The regulating circuit permits to use an external capacitance of extremely small size and upon the reaching of a fully charged condition by the external capacitor, the control circuit self-isolates and does not influence in any way the normal operation of the amplifier.
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公开(公告)号：DE60225603T2
公开(公告)日：2009-04-23
申请号：DE60225603
申请日：2002-07-19
Applicant: ST MICROELECTRONICS SRL
Inventor： FAGNANI MAURO , PIDUTTI ALBINO , ADRAGNA CLAUDIO
Abstract: A bootstrap circuit for switching power supplies (SMPS), a switching power supply including a bootstrap circuit, and an integrated circuit of a switching power supply, are provided. The bootstrap circuit ( 13 ) for switching power supplies includes a first supply voltage (Vin) coming from a first terminal and a second supply voltage (Vcc) coming from a second terminal and a third terminal ( 30 ). The bootstrap circuit includes: a first current path between the first terminal and the third terminal ( 30 ); a second current path between the first terminal and the second terminal; a third current path between the second terminal and the third terminal ( 30 ); and a two-way voltage regulator (M 3 , Dz 2 , R 5 , R 6 ) placed along the second current path.
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Patent Agency Ranking
公开(公告)号：DE60009892T2
公开(公告)日：2005-04-21
申请号：DE60009892
申请日：2000-07-31
Applicant: ST MICROELECTRONICS SRL
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公开(公告)号：DE60225603D1
公开(公告)日：2008-04-24
申请号：DE60225603
申请日：2002-07-19
Applicant: ST MICROELECTRONICS SRL
Inventor： FAGNANI MAURO , PIDUTTI ALBINO , ADRAGNA CLAUDIO
Abstract: A bootstrap circuit for switching power supplies (SMPS), a switching power supply including a bootstrap circuit, and an integrated circuit of a switching power supply, are provided. The bootstrap circuit ( 13 ) for switching power supplies includes a first supply voltage (Vin) coming from a first terminal and a second supply voltage (Vcc) coming from a second terminal and a third terminal ( 30 ). The bootstrap circuit includes: a first current path between the first terminal and the third terminal ( 30 ); a second current path between the first terminal and the second terminal; a third current path between the second terminal and the third terminal ( 30 ); and a two-way voltage regulator (M 3 , Dz 2 , R 5 , R 6 ) placed along the second current path.
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公开(公告)号：DE60025324D1
公开(公告)日：2006-03-30
申请号：DE60025324
申请日：2000-03-17
Applicant: ST MICROELECTRONICS SRL
Inventor： GATTAVARI GIUSEPPE , ADRAGNA CLAUDIO , FAGNANI MAURO
IPC: H02M3/335
Abstract: A method and a circuit for disabling a converter while allowing its self-recovery, the converter circuit comprising a transformer (T1) provided with an auxiliary winding (L1) self-supplying, after start-up, an integrated circuit (IC) containing the programming, driving, controlling and protecting circuitry of the converter, a start-up circuit directly connected to a power source, a rectifying circuit (D1, C1) of the voltage induced in the auxiliary winding (L1), supplying through a voltage regulator stage (R1, Z1, T1) the integrated circuit at a regulated voltage (Vreg), at least an external line comprising a sensor of an electrical or physical quantity to be monitored (NTC, Rs), biased to a reference voltage, functionally coupled to a disable input pin (A-REC) of the integrated circuit for disabling it when a certain threshold value is surpassed. The method consists in using the regulated self-supply voltage of the converter (Vreg) as biasing voltage of the external sensor line and as reference voltage of an hysteresis comparator monitoring the signal representing the monitored quantity produced an the external sensor line. Upon the switching of the hysteresis comparator the integrated converter circuit (IC) is turned off and the limiting value of the rectified voltage (Vcc) self-supplying the integrated converter circuit (IC) is markedly reduced by short-circuiting to ground a portion (Z4, Z5) of a sectionable voltage clamp chain (Z2, Z3, Z4, Z5) coupled between the output (Vcc) of the rectifying circuit (D1, C1) and a common ground node of the circuit.
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公开(公告)号：AU2002326145A1
公开(公告)日：2004-02-09
申请号：AU2002326145
申请日：2002-07-19
Applicant: ST MICROELECTRONICS SRL
Inventor： FAGNANI MAURO , PIDUTTI ALBINO , ADRAGNA CLAUDIO
Abstract: A bootstrap circuit for switching power supplies (SMPS), a switching power supply including a bootstrap circuit, and an integrated circuit of a switching power supply, are provided. The bootstrap circuit ( 13 ) for switching power supplies includes a first supply voltage (Vin) coming from a first terminal and a second supply voltage (Vcc) coming from a second terminal and a third terminal ( 30 ). The bootstrap circuit includes: a first current path between the first terminal and the third terminal ( 30 ); a second current path between the first terminal and the second terminal; a third current path between the second terminal and the third terminal ( 30 ); and a two-way voltage regulator (M 3 , Dz 2 , R 5 , R 6 ) placed along the second current path.
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公开(公告)号：DE69413638T2
公开(公告)日：1999-02-25
申请号：DE69413638
申请日：1994-07-25
Applicant: ST MICROELECTRONICS SRL
Inventor： FAGNANI MAURO , FERRARIO BRUNO , SANDRI PAOLO
Abstract: A circuit for regulating the time of charging of the output node of an amplifier at start up, commonly comprising an external soft-start capacitor charged by a current delivered by a pull-up transistor (QG19) of a push-pull output stage of the amplifier, through a decoupling diode (QG23) that is functionally connected between the output node of the amplifier and an armature of the external soft-start capacitor, is provided with a current mirror feed back circuit capable of mirroring a current function of the charge current of the external soft-start capacitor on the driving node of the pull-up transistor (QG19) of the output stage of the amplifier. The regulating circuit permits to use an external capacitance of extremely small size and upon the reaching of a fully charged condition by the external capacitor, the control circuit self-isolates and does not influence in any way the normal operation of the amplifier.
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