| 摘要 |
PURPOSE:To execute quickly a response with respect to any variation of a load, and also to reduce degradation in efficiency by controlling reversely conduction degrees of the first and the second control transistors by an output signal of a comparison amplifier. CONSTITUTION:When a load 8 is varied, a current Ir flowing to the load is varied, and a voltage of a point A is varied. In accordance with its result, a voltage of a point (a) is also varied, therefore, an output signal of a comparison amplifier 14 is also varied, and in accordance with its variation quantity, conduction degrees of one of control transistors TR 15, 16, and a conduction degree of the other are controlled so as to become large and small, respectively. For instance, when the current Ir increases, a voltage of the point A drops and a voltage Va also drops. In accordance with its result, the output signal of the amplifier 14 becomes high, therefore, a conduction degree of the TR15 becomes large, a current Ia increases, a conduction degree of the TR16 becomes small and a current Ib decreases. As a result, the voltage of the point A is controlled so as to become high. |
