| 摘要 |
A main P-channel field effect transistor 1 exhibiting a larger current driving capacity and an auxiliary P-channel field effect transistor 8 exhibiting a smaller current driving capacity are coupled in parallel across the input terminal 2 and the output terminal 3. When a voltage is applied on the input terminal 2, the output of the comparator 7 falls to the low level L, and the auxiliary P-channel field effect transistor 8 is first turned on. Since the current driving capacity of the auxiliary P-channel field effect transistor 8 is small, the voltage at the output terminal 3 rises gradually at a limited rate. When the voltage at the output terminal 3 exceeds a predetermined level, the output of a second comparator 9 falls to the low level L, and thereby turns on the main P-channel field effect transistor 1.
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