| 摘要 |
PROBLEM TO BE SOLVED: To obtain a multiple output switching power supply which obtains a plurality of output voltages highly stable with respect to fluctuations in external factors. SOLUTION: A smoothing circuit comprising an auxiliary switching transistor Q2, a choke coil L2, a commutation diode D2, and a capacitor C2 is connected between an output capacitor C2 and a second output terminal 3. The base of the auxiliary switching transistor Q2 is connected with one end of a choke coil L1 via a parallel circuit comprising a resistor R5 and a capacitor C4, and an operational relation is expressed as 'on-on' to between the auxiliary switching transistor Q2 and a main switching transistor Q1. Furthermore, a transistor circuit containing a first control transistor Q3 and a second control transistor Q4 is connected with the base of the auxiliary switching transistor Q2 to stabilize a second output voltage Vo2.
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