Motor drive circuit, motor system, and motor drive method

摘要: A circuit suitable for formation as a small sized IC, able to decrease the number of externally attached parts and reduce size, stably rotating motor. When rotor 101 by three-phase drive signals U, V, W generated based on CLK signal from VCO 7 , induction voltages induced in coils 102 are monitored phase deviation relative an electric is detected. As result, when late phase, charge pump 5 driven up f_up which becomes active exactly time accordance with delay amount, while advanced, down f_down corresponding advance amount. In this motor 1 voltage control terminal T_cp directly instantaneously dynamically changed not detected information without going through smoothing filter.