| 摘要 |
<p>Turning on/off an NMOS (11) causes a driving current to flow through a solenoid (15). The driving current flows through a converter circuit (16), and an amplifier circuit (17) amplifies an output current from the converter circuit (16) to output a current detection result. A plurality of resistor elements (161-16n) constituting the converter circuit (16) are distributively formed on a semiconductor substrate (100) together with the elements constituting the amplifier circuit (17). Therefore, even when the driving current causes the converter circuit (16) to exhibit an increased temperature and have its characteristic varied, the amplifier circuit (17) is caused to exhibit nearly the same temperature and have its characteristic varied, whereby a current detection can be implemented with high accuracy without using any temperature compensating components.</p> |
