| 摘要 |
<p>PURPOSE:To ensure a high-speed rise for the output voltage of a power supply circuit, by giving a high-speed switching action if the input terminal voltage of the transistor driver of a switching circuit exceeds the thershold level even by a slight amount. CONSTITUTION:A time constant circuit consisting of the resistance 9, Zener diode 10 and capacitor 11 is connected in parallel to the smoothing capacitor 3. The transistor driver 12 contains the terminals B and E connected across the capacitor 11 plus the terminal C connected to the common terminal of the 3-terminal regulator 5 respectively. The driver 12 has a high-speed operation when the voltage VC2 to be supplied to the terminal B exceeds the threshold level even by a slight amount. As a result, the output voltage Vout of the power supply circuit has a high-speed rise.</p> |
