公开(公告)号：US20230026059A1

公开(公告)日：2023-01-26

申请号：US17785172

申请日：2020-12-17

申请人： Rohm Co., Ltd.

发明人： Toru TAKUMA

IPC分类号： H02H7/22

摘要： For example, an overcurrent protection circuit 71 includes a hiccup controller 71b which, when an output current To passing through a switching element 10 goes into an overcurrent state, hiccup-drives the switching element 10 such that predetermined on-period ton and off-period toff alternate. For example, the hiccup controller 71b may control at least one of the on- and off-period ton and toff according to a temperature sense signal S71c. For example, the temperature sense signal S71c may be generated by detecting at least one of temperature Tj of the switching element 10 and a difference in temperature ΔTj between the switching element 10 and another element. For example, when at least one of temperature Tj and the difference in temperature ΔTj is higher than a predetermined threshold value, the hiccup controller 71b may conduct at least one of reduction of the on-period ton and increase of the off-period toff.

公开(公告)号：US20220308612A1

公开(公告)日：2022-09-29

申请号：US17655854

申请日：2022-03-22

申请人： ROHM Co., LTD.

发明人： Kenji MURAOKA ,  Toru TAKUMA

IPC分类号： G05F1/573 ,  H03K19/003 ,  H02H3/08 ,  H03K17/081 ,  B60R16/02

摘要： 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.

公开(公告)号：US20240088884A1

公开(公告)日：2024-03-14

申请号：US18465338

申请日：2023-09-12

申请人： ROHM CO., LTD.

发明人： Katsuaki YAMADA ,  Makoto SADA ,  Toru TAKUMA

IPC分类号： H03K17/081 ,  B60L50/50 ,  H03K17/06 ,  H03K17/687

CPC分类号： H03K17/08104 ,  B60L50/50 ,  H03K17/063 ,  H03K17/6871

摘要： A semiconductor device includes: a first output transistor and a second output transistor configured to be connected between a first terminal and second terminal; an active clamp circuit configured to be connected to a first control terminal of the first output transistor to limit a terminal-to-terminal voltage appearing between the first and second terminals to a clamp voltage or less; a first variable resistive element provided between a node configured to be fed with a control signal and the first control terminal; a second variable resistive element provided between the node and a second control terminal of the second output transistor; and a turn-off circuit configured to be connected to a connection node between the second variable resistive element and the second control terminal so as to be able to turn the second output transistor off.

公开(公告)号：US20230133872A1

公开(公告)日：2023-05-04

申请号：US18049731

申请日：2022-10-26

申请人： ROHM Co., LTD.

发明人： Toru TAKUMA ,  Adrian Joita ,  Shuntaro Takahashi

IPC分类号： H01L27/02 ,  H01L29/78 ,  H02M3/156

摘要： 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.

公开(公告)号：US20200212664A1

公开(公告)日：2020-07-02

申请号：US16726461

申请日：2019-12-24

申请人： Rohm Co., Ltd.

发明人： Toru TAKUMA ,  Shuntaro TAKAHASHI

IPC分类号： H02H1/00 ,  B60R16/02 ,  H02H3/087 ,  H03K17/0812 ,  H03K17/14 ,  H03K19/003 ,  H03K17/687

摘要： A switching device has, for example, a first terminal configured to be connected to an application node for a first voltage, a second terminal configured to be connected to the first end of a load, a third terminal configured to be connected to the second end of the load and to an application node for a second voltage, a switching element configured to be connected between the first and second terminals, a first active clamper configured to limit the output voltage at the second terminal with reference to the first voltage in a first state, and a second active clamper configured to limit the output voltage with reference to the second voltage in a second state different from the first state.

公开(公告)号：US20240128169A1

公开(公告)日：2024-04-18

申请号：US18533721

申请日：2023-12-08

申请人： ROHM CO., LTD.

发明人： Hajime OKUDA ,  Yuto NISHIYAMA ,  Toru TAKUMA

IPC分类号： H01L23/495 ,  H01L23/31

CPC分类号： H01L23/49568 ,  H01L23/3135 ,  H01L23/4952 ,  H01L23/49562 ,  H01L23/49575

摘要： A semiconductor device is configured to increase energy absorbed by an active clamp. The semiconductor device comprises a semiconductor element, a sealing resin, and a coating member. The semiconductor element includes a first electrode. The sealing resin covers the semiconductor element. The coating member is interposed between the first electrode and the sealing resin. The coating member contains a material with higher thermal conductivity than the sealing resin.

公开(公告)号：US20230216289A1

公开(公告)日：2023-07-06

申请号：US18181064

申请日：2023-03-09

申请人： Rohm Co. Ltd.

发明人： Toru TAKUMA ,  Naoki TAKAHASHI ,  Shuntaro TAKAHASHI

IPC分类号： H02H1/00 ,  H02H3/093 ,  B60R16/02 ,  H02H3/087 ,  H02H7/20 ,  B60R16/03

CPC分类号： H02H1/0007 ,  H02H3/093 ,  B60R16/02 ,  H02H3/087 ,  H02H7/20 ,  B60R16/03 ,  H02H7/205

摘要： 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.

公开(公告)号：US20210288637A1

公开(公告)日：2021-09-16

申请号：US17197312

申请日：2021-03-10

申请人： ROHM Co., LTD.

发明人： Toru TAKUMA

IPC分类号： H03K17/082

摘要： Disclosed herein is an overcurrent protection circuit configured to, upon detection of an output current that flows through a switch element reaching a first overcurrent limit value, reduce an overcurrent limit value for the output current from the first overcurrent limit value to a second overcurrent limit value smaller than the first overcurrent limit value.

公开(公告)号：US20190190512A1

公开(公告)日：2019-06-20

申请号：US16218724

申请日：2018-12-13

申请人： Rohm Co., Ltd.

发明人： Toru TAKUMA

IPC分类号： H03K17/082 ,  B60R16/03 ,  G01K7/16 ,  H02H5/04 ,  H02H6/00 ,  H02H3/08 ,  H02M3/156 ,  H03K17/16

CPC分类号： H03K17/0828 ,  B60R16/03 ,  G01K7/16 ,  H02H3/08 ,  H02H5/04 ,  H02H6/00 ,  H02M3/156 ,  H03K17/168

摘要： 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.

公开(公告)号：US20170041994A1

公开(公告)日：2017-02-09

申请号：US15219618

申请日：2016-07-26

申请人： ROHM CO., LTD.

发明人： Koji KATSURA ,  Toru TAKUMA ,  Yasunori MURAMATSU

IPC分类号： H05B33/08 ,  H03K3/0233 ,  H05B37/02 ,  H03K7/08

CPC分类号： H05B33/0815 ,  H03K3/02337 ,  H03K7/08 ,  H05B33/0845 ,  H05B33/0884 ,  H05B37/0281

摘要： An oscillation circuit for generating a clock signal of a switching power supply circuit is provided. The oscillation circuit includes a circuit configured to perform frequency spreading control of the clock signal in synchronization with an output operation control signal for periodically turning on/off an output operation of the switching power supply circuit.

摘要翻译： 提供了一种用于产生开关电源电路的时钟信号的振荡电路。 振荡电路包括与用于周期性地接通/关断开关电源电路的输出操作的输出操作控制信号同步地执行时钟信号的频率扩展控制的电路。