Rohm Co., Ltd.

Kotaro Shibata

Hideki Sawada

Akinobu Sawada

Masaaki Matsuo

A semiconductor device includes semiconductor elements. Each semiconductor element, including first, second and third electrodes, is controlled to turn on and off current flow between the first electrode and the second electrode by drive signals inputted to the third electrode. The first electrodes of the semiconductor elements are electrically connected mutually, and the second electrodes of the semiconductor elements are electrically connected mutually. The semiconductor device further includes a control terminal receiving the drive signals, a first wiring section connected to the control terminal, a second wiring section, and third wiring sections, and further a first connecting member electrically connecting the first and the second wiring sections, a second connecting member electrically connecting the second wiring section and each third wiring section, and third connecting members connecting the third wiring sections and the third electrodes of the semiconductor elements.

Semiconductor apparatus

A semiconductor device includes first semiconductor elements, a control terminal, a first conductive member, and first circuit components. The first semiconductor elements are connected in parallel, and a switching operation of each first semiconductor element is controlled according to a first drive signal inputted to a third electrode of each first semiconductor element. The first conductive member is electrically connected to the control terminal to which the first drive signal is inputted, and is electrically interposed between the third electrodes. The first conductive member includes connecting members and a portion of a signal wiring section. Each of the first circuit components increases an impedance in a first frequency band. The first frequency band includes a resonance frequency of a resonance circuit that is formed by including a parasitic inductance of the first conductive member. The third electrodes of the first semiconductor elements are electrically connected to each other via at least one of the first circuit components.

Semiconductor device

Power semiconductor module

Circuit board for power semiconductor module

An LED power supply device disclosed in the present specification includes a DC dimmer circuit that performs dimming control of an LED such that the higher a reference voltage variably controlled according to a dimmer signal is, the smaller a current flowing in the LED is. This configuration makes it possible to achieve fine dimming control.

Growing community of inventors

Kyoto, Japan

Kotaro Shibata