| 摘要 |
PROBLEM TO BE SOLVED: To restrain generation of spike current by equalizing current passing through a switching element for switching driving current to the drive coil of a motor. SOLUTION: At the surface of a printed circuit board, there is provided the first common circuit pattern 3 which extends to the drain insertion holes D1, D3, D5 of transistors Q1, Q3, Q5 from a plus side power supply terminal P1, the second common circuit pattern 5 which extends to the source insertion holes S2, S4, S6 of transistors Q2, Q4, Q6 from a ground side power supply terminal P2, and driving circuit patterns 7, 9, 11. At the back surface of the printed circuit board 1, the first and second auxiliary circuit patterns 13, 15 are formed, which are parallel-connected to the respective first and second common circuit patterns 3, 5, to meet respective combined resistance values from the first and second power source terminals P1, P2 to the transistors Q1-Q6, respectively. |
