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    Switching power supply operable in an intermittent driving mode
    1.
    发明授权
    Switching power supply operable in an intermittent driving mode 有权

    公开(公告)号：US10826397B2

    公开(公告)日：2020-11-03

    申请号：US16374929

    申请日：2019-04-04

    Applicant: Rohm Co., Ltd.

    Inventor： Seiji Takenaka ,  Masashi Nagasato ,  Tetsuo Tateishi

    IPC: H02M3/158 ,  H02M3/156

    Abstract: A switching power supply includes: a switching output circuit configured to generate an output voltage from an input voltage by charging a capacitor by turning on and off an output transistor; a control circuit configured to halt the driving of the switching output circuit when charging electric charge to the capacitor per switching event is limited to a lower limit value and the output voltage, or a feedback voltage commensurate therewith, is raised from a predetermined reference voltage; and a lower limit value setting circuit configured to variably control the lower limit value during the driven period of the switching output circuit. For example, the lower limit value setting circuit can increase the lower limit value with increase in the number of times of switching.

    Switching power supply circuit, liquid crystal driving device, and liquid crystal display device
    3.
    发明授权
    Switching power supply circuit, liquid crystal driving device, and liquid crystal display device 有权

    公开(公告)号：US10707754B2

    公开(公告)日：2020-07-07

    申请号：US15162879

    申请日：2016-05-24

    Applicant: Rohm Co., Ltd.

    Inventor： Seiji Takenaka

    IPC: H02M3/157 ,  H02M3/156

    Abstract: A switching power supply circuit includes a switching output unit that generates an output voltage from an input voltage using an output transistor, a switching control unit that controls on and off of the output transistor so that the output voltage or a feedback voltage in proportion to the output voltage agrees with a predetermined reference voltage, and one of an interrupt unit and a reference voltage setting unit. The interrupt unit forcibly turns off the output transistor during a period while the output voltage or the feedback voltage is higher than a threshold value voltage that is higher than the reference voltage in response to a periodic load change. The reference voltage setting unit temporarily changes the reference voltage in synchronization with timing of a periodic load change.

    Switching power supply circuit, load driving device, and liquid crystal display device
    4.
    发明授权
    Switching power supply circuit, load driving device, and liquid crystal display device 有权

    公开(公告)号：US10468982B2

    公开(公告)日：2019-11-05

    申请号：US15409699

    申请日：2017-01-19

    Applicant: Rohm Co., Ltd.

    Inventor： Seiji Takenaka

    IPC: H02M3/156 ,  H02M3/158 ,  H02M1/00 ,  G09G3/36

    Abstract: A switching power supply circuit has a switching output stage which generates an output voltage from an input voltage by driving a coil current by using an output transistor and a switching controller which turns ON and OFF the output transistor to keep the output voltage or a feedback voltage commensurate with it equal to a predetermined reference voltage. The switching controller includes a reference slope voltage generator which generates a reference slope voltage, a sense voltage holder which generates a held sense voltage by latching a sense voltage commensurate with the coil current with predetermined timing, and a voltage adder which generates a slope voltage by adding up the reference slope voltage and the held sense voltage. The switching controller determines the ON duty of the output transistor by using the slope voltage.

    Oscillation circuit
    6.
    发明授权
    Oscillation circuit 有权

    公开(公告)号：US10348189B2

    公开(公告)日：2019-07-09

    申请号：US15428333

    申请日：2017-02-09

    Applicant: Rohm Co., Ltd.

    Inventor： Seiji Takenaka

    IPC: H02M1/44 ,  H03K3/03 ,  H03K4/50 ,  H03B23/00

    Abstract: An oscillation circuit includes: a periodic signal generator which generates a periodic signal whose frequency varies; and a clock generator which generates a clock signal having a frequency commensurate with the frequency of the periodic signal.

    Non-volatile memory
    8.
    发明授权
    Non-volatile memory 有权

    公开(公告)号：US12277994B2

    公开(公告)日：2025-04-15

    申请号：US18247114

    申请日：2021-09-02

    Applicant: Rohm Co., Ltd.

    Inventor： Seiji Takenaka

    IPC: G11C7/00 ,  G11C7/08 ,  G11C7/10

    Abstract: A non-volatile memory includes a memory cell having a first transistor and a second transistor, a driving circuit arranged to apply a read voltage to gates of the first and second transistors, and a signal output circuit arranged to output a signal associated with a first value or a signal associated with a second value, based on drain currents of the first and second transistors, in a read operation in which the read voltage is applied. The second transistor is constituted of a parallel circuit of a plurality of unit transistors, and gate width of each of the unit transistors is larger than that of the first transistor.

    Non-volatile memory
    9.
    发明授权
    Non-volatile memory 有权

    公开(公告)号：US12224010B2

    公开(公告)日：2025-02-11

    申请号：US18021606

    申请日：2021-08-05

    Applicant: ROHM CO., LTD.

    Inventor： Seiji Takenaka

    IPC: G11C16/04 ,  G11C16/10 ,  G11C16/26

    Abstract: A non-volatile memory has: a first and a second transistor having their gates connected together; a resistor having a first and a second terminal, with the first terminal connected to the source of the first transistor; a read voltage feed circuit configured to feed a read voltage for turning on at least one of the first and second transistors to between the gate of the first transistor and the second terminal of the resistor and to between the gate and the source of the second transistor; and a signal output circuit configured to output, in a read operation in which the read voltage feed circuit feeds the read voltage, a signal associated with a first or second value based on the drain currents of the first and second transistors.

    SWITCHING POWER SUPPLY, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND DIFFERENTIAL INPUT CIRCUIT
    10.
    发明申请
    SWITCHING POWER SUPPLY, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND DIFFERENTIAL INPUT CIRCUIT 有权

    公开(公告)号：US20220247371A1

    公开(公告)日：2022-08-04

    申请号：US17725860

    申请日：2022-04-21

    Applicant: Rohm Co., Ltd.

    Inventor： Masashi Nagasato ,  Seiji Takenaka ,  Tetsuo Tateishi

    IPC: H03F3/45 ,  H02M3/158 ,  H03F1/52 ,  H03F3/217

    Abstract: This switching power source 100 has: a switching output circuit 110 which drives an inductor current IL by turning on and off an upper switch 111 and a lower switch 112 and generates an output voltage VOUT from an input voltage PVDD; a lower current detection unit 210 which detects the inductor current IL flowing through the lower switch 112 during an ON-period of the lower switch 112 and acquires lower current feedback information Iinfo; an error amplifier 140 which outputs voltage feedback information Vinfo including information on an error between the output voltage VOUT (feedback voltage FB) and a reference voltage REF; an information synthesis unit 220 that generates synthesis feedback information VIinfo by synthesizing Iinfo with Vinfo; and an information holding unit 230 which samples Vinfo during the ON-period of the lower switch 112.

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