| 摘要 |
<p>A DC converter in which instability of operation due to error of a bottom detection circuit or unsettled detection point by disturbance is improved. The DC converter comprises the bottom detection circuit (13) for detecting the minimum voltage of a main switch Q1 after an auxiliary switch Q2 is turned off, a circuit (21) generating an ideal gate signal for turning on the main switch Q1 at the time when it has the minimum voltage based on the output from the bottom detection circuit (13), a comparison circuit (22) for calculating the error output between the ideal gate signal generated from the ideal gate signal generating circuit (21) and an actual gate signal when the main switch Q1 is turned on, and a first delay circuit (14) for bringing the actual gate signal close to the ideal gate signal through on-time delay control of the main switch Q1 by the actual gate signal based on the error output from the comparison circuit (22).</p> |
