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    SWITCHING POWER SUPPLY
    11.
    发明申请
    SWITCHING POWER SUPPLY 审中-公开

    公开(公告)号：US20200076310A1

    公开(公告)日：2020-03-05

    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.

    Semiconductor device, OTP readout circuit, and OTP circuit
    13.
    发明授权
    Semiconductor device, OTP readout circuit, and OTP circuit 有权

    公开(公告)号：US12046311B2

    公开(公告)日：2024-07-23

    申请号：US17568472

    申请日：2022-01-04

    Applicant: ROHM CO., LTD.

    Inventor： Seiji Takenaka

    IPC: G11C17/18 ,  G11C17/16

    CPC classification number: G11C17/18 ,  G11C17/16

    Abstract: An OTP readout circuit includes an OTP circuit having a first OTP cell in which data is programmable only once, and a readout-possible signal output unit configured to generate a readout-possible voltage for reading out the data and output the generated readout-possible voltage to the OTP circuit. The readout-possible voltage from the readout-possible signal output unit causes the OTP circuit to read out the data programmed into the first OTP cell.

    SWITCHING POWER SUPPLY, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND DIFFERENTIAL INPUT CIRCUIT
    15.
    发明申请
    SWITCHING POWER SUPPLY, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, AND DIFFERENTIAL INPUT CIRCUIT 有权

    公开(公告)号：US20210257978A1

    公开(公告)日：2021-08-19

    申请号：US17056314

    申请日：2018-12-18

    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.

    DC/DC converter
    16.
    发明授权
    DC/DC converter 有权

    公开(公告)号：US09893616B2

    公开(公告)日：2018-02-13

    申请号：US15415210

    申请日：2017-01-25

    Applicant: ROHM CO., LTD.

    Inventor： Seiji Takenaka

    IPC: H02M3/155 ,  H02M3/158 ,  H02M3/157 ,  H02M1/084 ,  H02M1/14 ,  H02M1/36 ,  H02M1/00

    CPC classification number: H02M3/157 ,  H02M1/084 ,  H02M1/14 ,  H02M1/36 ,  H02M3/1584 ,  H02M2001/0009

    Abstract: An error amplifier amplifies a difference between a feedback signal VFB that corresponds to an output voltage VOUT of a DC/DC converter and its target value VREF, so as to generate an error signal VERR. A pulse width modulator for each channel is configured as a peak current mode modulator comprising a PWM comparator that compares a current detection signal VIS with the error signal VERR, and a logic circuit. When the number of enabled channels is switched, a soft shedding circuit selects at least one channel as a correction target channel. The soft shedding circuit generates a correction signal VCORR for each correction target channel, and superimposes each correction signal VCORR on at least one of two inputs of the corresponding PWM comparator.

    SWITCHING POWER SUPPLY CIRCUIT, LIQUID CRYSTAL DRIVING DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE
    17.
    发明申请
    SWITCHING POWER SUPPLY CIRCUIT, LIQUID CRYSTAL DRIVING DEVICE, AND LIQUID CRYSTAL DISPLAY DEVICE 有权
    切换电源电路，液晶驱动装置和液晶显示装置

    公开(公告)号：US20160379581A1

    公开(公告)日：2016-12-29

    申请号：US15186737

    申请日：2016-06-20

    Applicant: Rohm Co., Ltd.

    Inventor： Seiji Takenaka

    IPC: G09G3/36 ,  H02M3/156

    CPC classification number: G09G3/3648 ,  G09G3/3696 ,  G09G2310/0289 ,  G09G2330/021 ,  G09G2330/04 ,  H02M1/32 ,  H02M3/156

    Abstract: A switching power supply circuit has: a switching output generator that generates an output voltage from an input voltage by using an output transistor; a switching controller that turns ON and OFF the output transistor so as to keep the output voltage, or a feedback voltage commensurate therewith, with a predetermined reference voltage; and a maximum duty controller that varies the maximum duty of the output transistor according to the reference voltage, the output voltage, or the feedback voltage.

    Abstract translation: 开关电源电路具有：通过使用输出晶体管从输入电压生成输出电压的开关输出发生器; 开关控制器，其以预定的参考电压将输出晶体管导通和截止以保持输出电压或与其相当的反馈电压; 以及根据参考电压，输出电压或反馈电压来改变输出晶体管的最大占空比的最大占空比控制器。

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