| 摘要 |
<p>In a switching regulator, the output voltage is controlled in accordance with a pulse width of a switching element such as a transistor on the primary side. Provision is made of a feedback element which converts the output voltage of the secondary side into a feedback current, which controls the charging amount of a capacitor (C3) that controls the on time of a transistor (Q1) of the primary side, and which controls the charging amount of a speed-up capacitor (C2) of the primary side. The charging amount of the capacitor (C3) that controls on time and the charging amount of the speed-up capacitor (C2) on the primary side are controlled in order to narrow the on time of the transistor (Q1) of the primary side. It is thus possible to prevent the output voltage from abnormally rising during the light load conditions.</p> |
