公开(公告)号：US10361633B2

公开(公告)日：2019-07-23

申请号：US15664019

申请日：2017-07-31

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Lombardo ,  Claudio Adragna ,  Salvatore Tumminaro

IPC: H02M3/335

Abstract: An integrated circuit includes an output terminal a first input terminal is configured to receive a signal proportional to a voltage between first and second terminals of the primary winding, and a second input terminal is configured to receive a signal proportional to a current flowing through the primary winding. A quasi-resonant (QR) circuit has a first input coupled to the first terminal, and a second input coupled to an output of an oscillator circuit. A selector circuit has a first input coupled to the output of the oscillator circuit, a second input coupled to an output of the QR circuit, and a select input. An output control circuit includes a first input coupled to the second input terminal, a second input coupled to an output of the selector circuit, and an output coupled to a control terminal of the switching transistor.

公开(公告)号：US20170353117A1

公开(公告)日：2017-12-07

申请号：US15664019

申请日：2017-07-31

Applicant: STMicroelectronics S.r.l.

Inventor： Giovanni Lombardo ,  Claudio Adragna ,  Salvatore Tumminaro

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M3/33507 ,  Y02B70/1433 ,  Y10T307/826

Abstract: An integrated circuit includes an output terminal a first input terminal is configured to receive a signal proportional to a voltage between first and second terminals of the primary winding, and a second input terminal is configured to receive a signal proportional to a current flowing through the primary winding. A quasi-resonant (QR) circuit has a first input coupled to the first terminal, and a second input coupled to an output of an oscillator circuit. A selector circuit has a first input coupled to the output of the oscillator circuit, a second input coupled to an output of the QR circuit, and a select input. An output control circuit includes a first input coupled to the second input terminal, a second input coupled to an output of the selector circuit, and an output coupled to a control terminal of the switching transistor.

公开(公告)号：US09780673B2

公开(公告)日：2017-10-03

申请号：US14157244

申请日：2014-01-16

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Giovanni Lombardo ,  Claudio Adragna ,  Salvatore Tumminaro

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M3/33507 ,  Y02B70/1433 ,  Y10T307/826

Abstract: A control device for controlling a switching power supply adapted to convert an input voltage into an output voltage according to a switching rate of a switching element. The control device includes first control means for switching the switching element in a first working mode at a constant frequency and second control means for switching the switching element in a second working mode at a variable frequency, under a maximum frequency, in response to the detection of a predefined operative condition of the switching power supply. The control device further includes means for selecting the first working mode or the second working mode.