Overcurrent protection circuit
    11.
    发明授权

    公开(公告)号:US11843235B2

    公开(公告)日:2023-12-12

    申请号:US18181064

    申请日:2023-03-09

    Applicant: Rohm Co., Ltd.

    Abstract: In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit has: a threshold value generation unit that, in accordance with a threshold value control signal, switches between setting an overcurrent detection threshold value to a first set value (∝ Iref) and a second set value (∝ Iset) lower than the first set value; an overcurrent detection unit that compares a sense signal in accordance with the current being monitored and the overcurrent detection value and generates an overcurrent protection signal; a reference value generation unit that generates a reference value (∝ Iset) in accordance with the seconds set value; a comparison unit that compares the sense signal and the reference value, and generates a comparison signal; and a threshold value control unit that monitors the comparison signal, and generates a threshold value control signal.

    Protection circuit and operational method of the protection circuit, and semiconductor integrated circuit apparatus

    公开(公告)号:US11128117B2

    公开(公告)日:2021-09-21

    申请号:US16042637

    申请日:2018-07-23

    Applicant: Rohm Co., Ltd.

    Abstract: A protection circuit includes: a high-side switch connected to a power terminal to which a predetermined power supply voltage VBB is supplied from an onboard battery; and an NMOS transistor MT1 connected to the high-side switch and configured to prevent an electrical conduction to the high-side switch when the onboard battery is reverse-connected to the power terminal, wherein a semiconductor integrated circuit is protected from a breakdown due to the reverse connection of the external power supply. A semiconductor integrated circuit apparatus includes the above-mentioned protection circuit configured to protect a semiconductor integrated circuit connected between the power terminal and the ground terminal, from an electro-static discharge breakdown. The protection circuit is connected to the clamp circuit unit inserted between the power terminal and the ground terminal, and is configured to protect the clamp circuit unit from a breakdown when the external power supply is reverse-connected.

    Apparatus for driving light emitting device

    公开(公告)号:US09815401B2

    公开(公告)日:2017-11-14

    申请号:US15285831

    申请日:2016-10-05

    Applicant: ROHM CO., LTD.

    CPC classification number: H05B33/0815 B60Q3/14 H05B33/0854 Y02B20/347

    Abstract: An apparatus for driving a light emitting device includes a constant current control circuit configured to control a current flowing through the light emitting device to be constant, and an extension circuit configured to generate a post-extending PWM signal obtained by extending a period of an input PWM signal having a first level. The constant current control circuit is turned on during the period of the post-extending PWM signal having the first level, and the constant current control circuit is turned off during a period of the post-extending PWM signal having a second level.

    Gate control circuit, semiconductor device, electronic apparatus, and vehicle

    公开(公告)号:US12218124B2

    公开(公告)日:2025-02-04

    申请号:US18049731

    申请日:2022-10-26

    Applicant: ROHM Co., LTD.

    Abstract: Disclosed is a gate control circuit that generates a gate control signal of an output transistor connected between an application end of a power supply voltage and an application end of an output voltage. The gate control circuit includes a first current source connected between the application end of the power supply voltage and the application end of the output voltage, a second current source connected between an application end of a booster voltage and an application end of a reference voltage, the booster voltage being raised to a voltage value higher than the power supply voltage in a steady state, an output stage that uses at least one of the first and second current sources to generate a gate charge current for charging a gate of the output transistor, and a controller that uses at least one of the first and second current sources according to the output voltage.

    Overcurrent protection circuit, switch device, electronic apparatus, and vehicle

    公开(公告)号:US11994889B2

    公开(公告)日:2024-05-28

    申请号:US17655854

    申请日:2022-03-22

    Applicant: ROHM Co., LTD.

    Abstract: Provided is an overcurrent protection circuit including an overcurrent detection unit configured to compare an output current flowing through a switch element and a predetermined overcurrent detection value to generate an overcurrent detection signal, an output activation detection unit configured to compare an output voltage and a predetermined threshold voltage to generate an output activation detection signal, a logic unit configured to combine the overcurrent detection signal and the output activation detection signal to generate a logic operation signal, and a diagnostic output unit configured to provide diagnostic output, the logic unit shifting the logic operation signal to a logic level of abnormal state when the overcurrent detection signal is shifted to a logic level of overcurrent detection state and holding the logic operation signal at that logic level, unless the output activation detection signal is shifted to a logic level of output activation state.

    Switch device
    17.
    发明授权

    公开(公告)号:US11876508B2

    公开(公告)日:2024-01-16

    申请号:US17552783

    申请日:2021-12-16

    Applicant: Rohm Co., Ltd.

    Inventor: Toru Takuma

    Abstract: A switch device includes a switching element that connects/disconnects a current path from a power supply terminal to a ground terminal via a load, and an overcurrent protection circuit that limits output current flowing in the switching element to be an overcurrent limit value or less. When an output short circuit of the load is detected, the overcurrent protection circuit decreases the overcurrent limit value to be lower as a power supply voltage is higher. In addition, the switch device preferably includes a switching element that connects/disconnects a current path from a power supply terminal to a ground terminal via a load, an intermittent control unit that intermittently drives the switching element when an abnormality is detected, and an output voltage monitoring portion that disables the intermittent control unit until an output voltage applied to the load reaches its target value.

    SEMICONDUCTOR DEVICE
    19.
    发明申请

    公开(公告)号:US20220352145A1

    公开(公告)日:2022-11-03

    申请号:US17623992

    申请日:2020-07-22

    Applicant: Rohm Co., Ltd.

    Abstract: For example, a semiconductor device includes an output electrode to be connected to an inductive load, a ground electrode to be connected to a ground terminal, first and second transistors connected in parallel between the output and ground electrodes, an active clamp circuit connected to the gate of the first transistor, and a gate control circuit to control the gates of the first and second transistors to keep the first and second transistors on in a first operation state and off in a second operation state. After a transition from the first operation state to the second, before the active clamp circuit operates, the gate control circuit short-circuits between the gate and source of the second transistor.

    OVERCURRENT PROTECTION CIRCUIT
    20.
    发明申请

    公开(公告)号:US20220037872A1

    公开(公告)日:2022-02-03

    申请号:US17503907

    申请日:2021-10-18

    Applicant: Rohm Co., Ltd.

    Abstract: In order both to accommodate instantaneous current as well as overcurrent protection in accordance with the load, an overcurrent protection circuit has: a threshold value generation unit that, in accordance with a threshold value control signal, switches between setting an overcurrent detection threshold value to a first set value (∝ Iref) and a second set value (∝ Iset) lower than the first set value; an overcurrent detection unit that compares a sense signal in accordance with the current being monitored and the overcurrent detection value and generates an overcurrent protection signal; a reference value generation unit that generates a reference value (∝ Iset) in accordance with the seconds set value; a comparison unit that compares the sense signal and the reference value, and generates a comparison signal; and a threshold value control unit that monitors the comparison signal, and generates a threshold value control signal.

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