| 摘要 |
<p>The invention is related to start-up circuit for providing a supply voltage for a pulse-width modulator of a switch-mode power supply, comprising a feed-in node (12) provided to be electrically connected with an external power source, comprising a linear voltage-regulator (13) for converting an input voltage into a supply voltage of the pulse-width modulator. The start-up circuit comprises a switching unit (14) arranged between the feed-in node (12) and the linear voltage-regulator (13), the switching unit (14) being provided to define a maximum input voltage applied to the linear voltage-regulator (13).</p> |
