| 摘要 |
A DC-DC converter includes an Nch FET<SUB>1 </SUB>which is series connected between an input terminal and an output terminal, and an Nch FET<SUB>2 </SUB>which is connected between the output terminal side of the Nch FET<SUB>1 </SUB>and a ground terminal. On the output terminal side of the circuits, a smoothing circuit and a comparator circuit are connected. The output side of the comparator circuit is connected to an on-time limiter circuit, and the on-time limiter circuit is connected to an H/S driver circuit for controlling the Nch FET<SUB>1 </SUB>through an inverter and directly connected to an L/S driver circuit for controlling the Nch FET<SUB>2</SUB>. Here, when a switching control signal for turning on the Nch FET<SUB>1 </SUB>is input to the on-time limiter circuit from the comparator, the on-time limiter circuit detects a time in the on state and outputs a signal by which the Nch FET<SUB>1 </SUB>is temporarily off controlled.
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