| 摘要 |
PURPOSE:To prevent the decrease in the delay time of a switching speed by providing two transistors (TR) (1st, 2nd TRs) and a diode inserted between a base of the 2nd TR and an output terminal and charging an output undershoot by a large current. CONSTITUTION:When a voltage at an output terminal 3 is lower than a voltage at a common terminal 5 by undershoot, the 2nd TR 20 is turned off and the 1st TR 19 is turned on, resulting that a large current is fed to an output terminal 3 thereby charging the undershoot of the voltage at the output terminal 3 in a short time. For example, when an output voltage Vo reaches 0V or below, the TR 20 is turned off and the TR 19 is turned on. Then the undershoot of the output voltage vo is recovered because a current flowing from the TR 19 charges the output terminal 3. When the output voltage Vo reaches 0V or over, the TR 20 is turned on and the TR 19 is turned off. |
