| 摘要 |
PURPOSE: To obtain the power supply circuit for a portable equipment using a battery for a power supply and requiring plural different power supply voltages. CONSTITUTION: The power supply circuit is provided with a stabilizing voltage generator 12 comprising a regulator circuit connecting to a battery 10, a switching power supply circuit 1, and a fixed frequency oscillator 7 applying a clock signal to a switching pulse generating circuit 1-5 as an external synchronizing signal of the switching power supply circuit 1. An output voltage of the stabilizing voltage generator 12 is fed to the switching power supply circuit 1 and a prescribed circuit block (control section 6) and an output voltage from the switching power supply circuit 1 is fed to the prescribed circuit block (high frequency section) whose load current is constant. |
