| 摘要 |
PURPOSE:To provide a driver for a DC motor in which noise can be reduced through a simple structure. CONSTITUTION:An address generating circuit 23 increments or decrements an address to be fed to a ROM 27 storing a content described later by 1 for every electric angle of 60 deg./2N, i.e., a pulse period divided equally by 2N. The ROM 27 is connected with a modulation circuit 8 and a toggle circuit 30. The toggle circuit 30 comprises a counter 31 being fed with a time data relevant to the duration of predetermined conducting state from the ROM 27 and performing the counting operation until the time data is reached or the time data becomes zero, a circuit 32 for latching an end signal upon finish of counting operation of the counter 31 corresponding to the time data, and a toggle type flip-flop circuit 33 having output being inverted between High and Low levels every time when a latching operation signal is fed from the latch circuit 32. |
