| 摘要 |
PROBLEM TO BE SOLVED: To make a boosting circuit small in size and low in cost without reducing its performance in an electric load driving device in which one boosting circuit (charge pump circuit) is shared by a plurality of transistor driving circuits. SOLUTION: This electric load driving device 1 is provided with output transistors T1 and T2 for outputting currents to two solenoids L1 and L2 and two driving circuits K1 and K2' for turning on/off the respective transistors T1 and T2 according to control signals S1 and S2, and an output voltage Vcp of one boosting circuit CP is shared by those driving circuits K1 and K2' so that the corresponding transistors T1 and T2 can be turned on. The driving circuit K2' whose priority is higher than that of the transistor T1 in term of driving responsiveness is constituted so that driving currents to the gate of the transistor T2 can be suppressed when it is detected that the output voltage Vcp of the boosting circuit CP is less than a reference voltage by a voltage judging circuit 46. |
