公开(公告)号：US20240006994A1

公开(公告)日：2024-01-04

申请号：US18214646

申请日：2023-06-27

Applicant: STMicroelectronics S.r.l.

Inventor： Tommaso ROSA ,  Alessandro BERTOLINI ,  Stefano RAMORINI ,  Alberto CATTANI

IPC: H02M3/158

CPC classification number: H02M3/158

Abstract: A DC-DC boost converter includes an input receiving an input voltage and an output producing an output voltage. A switching stage is formed by a low-side transistor arranged between a switching node and a ground node, and a high-side transistor arranged between the switching node and the output. The high-side transistor includes a body diode having an anode coupled to the switching node and a cathode coupled to the output. The converter is controlled in an asynchronous operation mode where the low-side transistor is driven alternately to a conductive state and a non-conductive state, and the high-side transistor is driven steadily to a non-conductive state. A variable load circuit is selectively coupled between the two output terminals when the converter is in the asynchronous operation mode in order to sink a load current having a value that is a function of a value of the input voltage.

公开(公告)号：US20230216404A1

公开(公告)日：2023-07-06

申请号：US18089736

申请日：2022-12-28

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro BERTOLINI ,  Alberto CATTANI ,  Alessandro GASPARINI

IPC: H02M3/157 ,  H02M1/08 ,  H02M3/158

CPC classification number: H02M3/157 ,  H02M1/08 ,  H02M3/158

Abstract: A supply node receives supply voltage and an output node provides a regulated output voltage to a load. A switching transistor is coupled between the supply and output nodes. The switching transistor is controlled by a drive signal generated by a control circuit to control switching activity. The control circuit includes circuitry to sense a feedback voltage indicative of the regulated output voltage and a comparator generating a comparison logic signal dependent on a comparison of the feedback voltage to a reference. A logic circuit generates a skip signal in response to the comparison logic signal. A counter generates a termination signal. Signal processing circuitry controls the switching activity by asserting the drive signal as a function of the skip signal and the termination signal.

公开(公告)号：US20220263412A1

公开(公告)日：2022-08-18

申请号：US17671163

申请日：2022-02-14

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro BERTOLINI ,  Alberto CATTANI ,  Stefano RAMORINI ,  Alessandro GASPARINI

IPC: H02M3/158 ,  H02M1/08 ,  H02M1/00

Abstract: A control circuit operates to control a switching stage of an electronic converter. The control circuit includes: first terminals providing drive signals to electronic switches of the switching stage; a second terminal receiving from a feedback circuit a first feedback signal proportional to a converter output voltage; and a third terminal configured to receive from a current sensor a second feedback signal proportional to an inductor current. A driver circuit provides the drive signals as a function of a PWM signal generated by a generator circuit as a function of the first and second feedback signals, a reference voltage and a slope compensation signal. A mode selection signal is generated as a function of a comparison between the input voltage and the output voltage. A feed-forward compensation circuit is configured to source and/or sink a compensation current as a function of a variation in the mode selection signal.

公开(公告)号：US20210226531A1

公开(公告)日：2021-07-22

申请号：US17147123

申请日：2021-01-12

Applicant: STMicroelectronics S.r.l.

Inventor： Alessandro BERTOLINI ,  Alberto CATTANI ,  Alessandro GASPARINI

IPC: H02M3/156 ,  H03F3/45 ,  G05F3/26 ,  G05F1/575 ,  G05F1/56 ,  G05F1/46

Abstract: A switching converter includes a voltage conversion circuit providing an output voltage from an input voltage and a PWM voltage generated in response to first and second oscillating voltages. The input stage of a transconductor circuit provides an input reference current following a difference between a reference voltage and a voltage dependent on the output voltage and according to a transconductance, and an output stage for providing an output reference current from the input reference current. A phase shifter shifts an oscillating reference voltage according to the output reference current to obtain the first and second oscillating voltages. The transconductance is controlled in response to the input voltage resulting in a change of the input reference current. Compensation for that change is provided by subtracting a variable compensation current from the input reference current, where the variable compensation current is generated in response to the input voltage.

公开(公告)号：US20190222204A1

公开(公告)日：2019-07-18

申请号：US15873270

申请日：2018-01-17

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Alberto CATTANI ,  Alessandro GASPARINI ,  Alessandro BERTOLINI

IPC: H03K4/90 ,  H03K4/501 ,  H03K3/011 ,  H03K3/023

CPC classification number: H03K4/90 ,  H03K3/011 ,  H03K3/023 ,  H03K4/501

Abstract: An auto-tuned ramp generator and a method for generating a sawtooth signal are provided. In the method and apparatus, a sawtooth signal is compared to a first reference voltage and a second reference voltage. In response to determining that the sawtooth signal does not exceed the first reference voltage, the voltage level of the sawtooth signal is increased. In response to determining that the sawtooth signal exceeds the second reference voltage, the voltage level of the sawtooth signal is decreased. The voltage level the sawtooth signal is retained if the sawtooth signal remains between the first and second reference voltages.