公开(公告)号：US20240130018A1

公开(公告)日：2024-04-18

申请号：US18397488

申请日：2023-12-27

Applicant: ROHM CO., LTD.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H05B45/3725 ,  H05B45/32 ,  H05B45/34 ,  H05B45/345 ,  H05B45/50

CPC classification number: H05B45/3725 ,  H05B45/32 ,  H05B45/34 ,  H05B45/345 ,  H05B45/50

Abstract: For example, a semiconductor device disclosed in the present description is configured to function as a component of a switching power supply, and includes: a current sense signal generator configured to generate a current sense signal by amplifying a sense voltage corresponding to the output current of the switching power supply; a voltage sense signal generator configured to generate a voltage sense signal corresponding to the output voltage of the switching power supply; a selector configured to output as a selected sense signal one of the current sense signal and the voltage sense signal according to a mode switch signal; and an output feedback controller configured to control the driving of the switching power supply based on the selected sense signal.

公开(公告)号：US20210076465A1

公开(公告)日：2021-03-11

申请号：US16992642

申请日：2020-08-13

Applicant: Rohm Co., Ltd.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H05B45/14

Abstract: A light emitting element driving device includes, for example, a slope voltage generator generating a slope voltage including information on an inductor current passing through a switching output stage, a sense amplifier generating a sense voltage commensurate with the output current fed to a light-emitting element from the switching output stage, a sense amplifier generating a control voltage commensurate with the difference between the sense voltage and a reference voltage, a comparator comparing the slope voltage with the control voltage to generate a comparison signal, a controller controlling the switching output stage in accordance with the comparison signal, and a clamper limiting the control voltage to equal to or lower than a clamp voltage commensurate with the slope voltage.

公开(公告)号：US20240138039A1

公开(公告)日：2024-04-25

申请号：US18400443

申请日：2023-12-29

Applicant: ROHM CO., LTD.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H05B45/14 ,  H05B45/345 ,  H05B45/3725

CPC classification number: H05B45/14 ,  H05B45/345 ,  H05B45/3725

Abstract: A level shifter includes a current output amplifier configured to output a first output current and a second output current through first and second output terminals thereof, respectively, a first resistor configured to be connected between each of an inverted input terminal and the first output terminal of the current output amplifier and an application terminal of a ground potential, and a second resistor configured to be connected between the second output terminal of the current output amplifier and an application terminal of a negative potential lower than the ground potential. A first analog signal referenced to the ground potential is accepted at a non-inverted input terminal of the current output amplifier, and a second analog signal referenced to the negative potential is outputted through one terminal of the second resistor.

公开(公告)号：US20240333162A1

公开(公告)日：2024-10-03

申请号：US18743485

申请日：2024-06-14

Applicant: ROHM CO., LTD.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H02M3/158 ,  H02M1/00 ,  H05B45/305 ,  H05B45/375 ,  H05B45/38

CPC classification number: H02M3/1588 ,  H05B45/305 ,  H05B45/375 ,  H05B45/38 ,  H02M1/0006 ,  H02M1/0009

Abstract: This light-emitting element drive control device (100) comprises: a drive logic unit (113) which performs a drive control of a switch output stage (N1, D1, L1) for dropping an input voltage (VIN) to an output voltage (VOUT) and supplying a light-emitting element therewith; a charge-pump power supply unit (α) which generates a step-up voltage (CP) higher than the input voltage (VIN); and a current detecting comparator (114) which receives a supply of the step-up voltage (CP) and the output voltage (VOUT) as power supply voltages, and generates control signals (SET, RST) for the drive logic unit (113) by directly comparing a current detection signal (Vsns) corresponding to an inductor current (IL) of the switch output stage with a peak detection value (Vsns_pk) and a bottom detection value (Vsns_bt).

公开(公告)号：US20230369980A1

公开(公告)日：2023-11-16

申请号：US18357377

申请日：2023-07-24

Applicant: Rohm Co., Ltd.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H02M3/158 ,  H05B45/305 ,  H05B45/38 ,  H05B45/375

CPC classification number: H02M3/1588 ,  H05B45/305 ,  H05B45/38 ,  H05B45/375 ,  H02M1/0006

Abstract: This light-emitting element drive control device (100) comprises: a drive logic unit (113) which performs a drive control of a switch output stage (N1, D1, L1) for dropping an input voltage (VIN) to an output voltage (VOUT) and supplying a light-emitting element therewith; a charge-pump power supply unit (α) which generates a step-up voltage (CP) higher than the input voltage (VIN); and a current detecting comparator (114) which receives a supply of the step-up voltage (CP) and the output voltage (VOUT) as power supply voltages, and generates control signals (SET, RST) for the drive logic unit (113) by directly comparing a current detection signal (Vsns) corresponding to an inductor current (IL) of the switch output stage with a peak detection value (Vsns_pk) and a bottom detection value (Vsns_bt).

公开(公告)号：US20250016898A1

公开(公告)日：2025-01-09

申请号：US18891075

申请日：2024-09-20

Applicant: ROHM CO., LTD.

Inventor： Ryo TAKAGI ,  Akira AOKI

IPC: H05B45/325 ,  H05B45/10

Abstract: A light-emitting element driving device includes an error amplifier configured to output a voltage corresponding to the difference between a voltage corresponding to the current flowing through a light-emitting element and a reference voltage, and to switch between an operating state and a non-operating state according to a control signal; a driver configured to drive, based on the output voltage of the error amplifier, a switching element in a voltage feeder configured to feed a voltage to the light-emitting element; and a suppressor configured, when the error amplifier switches from the non-operating state to the operating state, to suppress a rise in the output voltage of the error amplifier.

公开(公告)号：US20240237168A9

公开(公告)日：2024-07-11

申请号：US18400443

申请日：2023-12-29

Applicant: ROHM CO., LTD.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H05B45/14 ,  H05B45/345 ,  H05B45/3725

CPC classification number: H05B45/14 ,  H05B45/345 ,  H05B45/3725

Abstract: A level shifter includes a current output amplifier configured to output a first output current and a second output current through first and second output terminals thereof, respectively, a first resistor configured to be connected between each of an inverted input terminal and the first output terminal of the current output amplifier and an application terminal of a ground potential, and a second resistor configured to be connected between the second output terminal of the current output amplifier and an application terminal of a negative potential lower than the ground potential. A first analog signal referenced to the ground potential is accepted at a non-inverted input terminal of the current output amplifier, and a second analog signal referenced to the negative potential is outputted through one terminal of the second resistor.

公开(公告)号：US20230422375A1

公开(公告)日：2023-12-28

申请号：US18038281

申请日：2021-12-20

Applicant: Rohm Co., Ltd.

Inventor： Daisuke KANBARA ,  Akira AOKI ,  Ryo TAKAGI

IPC: H05B45/50 ,  H05B45/3725

CPC classification number: H05B45/50 ,  H05B45/3725

Abstract: A power control device is configured to control a power circuit that generates an output voltage based on an input supply voltage relative to a ground, and includes a first terminal fed with a common voltage, a second terminal connectable to an application terminal for the ground, a P-type substrate fed with the common voltage, a MOS transistor connected between the first and second terminals and configured with an N-channel MOSFET, and an internal reference voltage generating circuit configured to generate, based on the input supply voltage, an internal reference voltage relative to the common voltage. When the input supply voltage is turned on, the MOS transistor is turned on and thereby the first and second terminals are short-circuited together.

公开(公告)号：US20230164892A1

公开(公告)日：2023-05-25

申请号：US17913339

申请日：2020-09-29

Applicant: ROHM CO., LTD.

Inventor： Akira AOKI ,  Ryo TAKAGI

IPC: H05B45/14 ,  B60Q1/14 ,  H05B45/325

CPC classification number: H05B45/14 ,  B60Q1/1415 ,  H05B45/325 ,  B60Q2300/05

Abstract: A lighting control device switches an input voltage to generate an output voltage and supplies a driving current based on the output voltage to a lighting unit. A raw control signal is generated to specify a lighting period and an extinction period alternately, and a corrected control signal is generated by correcting the raw control signal based on the current through the lighting unit. A switching controller performs the switching of the input voltage during the lighting period specified by the corrected control signal and suspends the switching of the input voltage during the extinction period specified by the corrected control signal.