| 摘要 |
PROBLEM TO BE SOLVED: To obtain a multi-output type switching power supply for obtaining a plurality of output voltages with improved stability with respect to the change in external factors. SOLUTION: A smoothing circuit, consisting of an auxiliary switching transistor Q2, a choke coil L2, a commutation diode D2, and a capacitor 3 is connected between an output capacitor C2 and a second output terminal 3. The base of the auxiliary switching transistor Q2 is connected to one terminal of a choke coil L1 via the parallel circuit of a resistor R3 and a capacitor C4. Also, the base of the auxiliary switching transistor Q2 is connected to the main current path of a control transistor Q3 via a capacitor C5. A diode D3 is connected in parallel with the main current path of the control transistor Q3, and a constant-voltage diode DZ1 is connected between the base of the control transistor Q3 and a second output terminal 3.
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