| 摘要 |
PURPOSE:To enhance the stability of a switching regulator by driving the base of a transistor for an oscillation of an inverter by the collector current of a transistor for regulating the base feedback current connected in series with the base feedback winding of an output transformer. CONSTITUTION:The ON time of a phototransistor 33b varies in accordance with a light emitting diode 33a in response to the variation in the output voltage, and a voltage between terminals of a capacitor 37 alters. Thus, the base current of a transistor 34 increases or decreases, and the collector current and hence the base feedback current of a transistor 12 is controlled, thereby correcting the variation in the output voltage. |
