摘要:
A semiconductor device enables a semiconductor element to turn off accurately and quickly at the time of short circuit of the load to protect the semiconductor element from the short circuit of the load. The semiconductor device comprises a first switching measure for turning on/off a current flowing into the load, a current detector for detecting current flowing into the load, a second switching measure for turning on/off a connection between the current detector and the load, and a controller for controlling the first switching measure and the second switching measure. The controller turns on the first switching measure, before turning on the second switching measure at the start of driving of the load. The current detector turns off the first switching measure when detecting excess current.
摘要:
A semiconductor device including first, second, third and fourth MOSFETs constituting an H bridge circuit. Each of the first and second MOSFETs is a vertical DMOSFET and each of the third and fourth MOSFETs is a lateral DMOSFET having a surface diffusion region formed in a portion of a drain region. The surface diffusion region has a conductivity type opposite that of a source region of the lateral DMOSFET and is electrically connected to the source region. Each of the surface diffusion regions may be made of a part of a channel stop region formed under a field insulator film. Each of the third and fourth MOSFETs may be a lateral DMOSFET having no surface diffusion region. Low on-resistance and small chip size of the device are obtained.
摘要:
An antenna device used for portable electronic appliances such as electronic wristwatches furnished with a reception function. Antenna device 100 is bent conforming to the side of watch case 201 and installed on the side of watch case 201. The antenna device is composed of an antenna 110 and an antenna case 150 in which the antenna 110 is housed. The antenna case is made of or coated with a non-metallic material and formed separately from a watch case made of a metallic material. In addition, the antenna case is fixed to watch case 201 with screws 152 at positions apart from the extended line P of antenna core 111.