| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor control circuit for a fuel pump, which simplifies a circuit structure. SOLUTION: When a command signal (a digital command signal Scd) is output from an engine ECU 60, the command signal is converted into an analog signal (an analog command signal Sca1) and the analog command signal is output to a differential circuit 104, in a D/A conversion circuit 105. At this time, if there is a difference between the analog command signal Sca1 and a current detection signal applied from a current detection circuit 103, a difference value signal is output according to the difference of an input value and the analog driving signal Sg of a power transistor 102 is appropriately adjusted, in the differential circuit 104. Thereby, passing current is appropriately adjusted according to adjustment of gate voltage, in the power transistor 102. COPYRIGHT: (C)2011,JPO&INPIT
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