| 摘要 |
PURPOSE:To allow a substrate voltage to reach a prescribed voltage in an early stage so as to prevent occurrence of latch up at the time of switching in a power supply by providing a resetting pulse generation circuit which outputs resetting pulses to a substrate voltage generating capacity regulation circuit at the time of switch in of the power supply. CONSTITUTION:At the time of switching in a power supply, a resetting pulse generation circuit 4 generates resetting pulses and a substrate voltage generating capacity regulation circuit 2 increases the substrate voltage generating capacity of a substrate voltage generation circuit 1 upon receiving the pulses. When the power supply voltage and, accordingly, a reference voltage stabilizes, a substrate voltage monitor circuit 3 compares the substrate voltage with the reference voltage and outputs a signal for increasing the substrate voltage and the circuit 2, upon receiving the signal, increases the substrate voltage generating capacity of the circuit 1. As a result, the substrate voltage reaches a prescribed voltage in an early stage. Therefore, occurrence of latch up can be prevented at the time of switching in the power supply, since the substrate voltage can reach a prescribed voltage in an early stage. |
