| 摘要 |
The PMOS transistor M1 is controlled by a time constant circuit 2 having a second resistor R2 and a capacitor C1 which are provided between a collector of the PNP transistor Q1 and the ground, and a hysteresis comparator 3, to which a voltage obtained by the time constant circuit 2 is applied, for controlling a gate of the PMOS transistor M1.
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