| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a semiconductor element for current control and a control device therewith which implement high accuracy current detection in a single chip IC by dynamically compensating for fluctuations in a gain a and an offset b. <P>SOLUTION: The semiconductor element for current control has a transistor 4, a current-voltage conversion circuit 22 and an AD converter 23 on the same semiconductor chip. A reference current generation circuit 6, 6' superimposes a current pulse Ic on a current to a load 2 to cause a digital voltage value output by the AD converter to fluctuate. A gain/offset correction section 8 signal-processes fluctuations in the digital voltage value by the reference current generation circuit 6, 6', and dynamically determines a gain a, a' and an offset b, b' in a linear relational expression of the digital voltage value output by the AD converter 23 and a digital current value of the load. A digital current value computation section 12 uses the gain and offset determined by the gain/offset correction section 8 to correct the voltage value output by the AD converter. <P>COPYRIGHT: (C)2013,JPO&INPIT |
