| 摘要 |
<p>A regulator comprises a converter 101 and a controlling unit 102. The converter is preferably a buck converter. The controlling unit is configured to adjust the input voltage Vbus according to the output voltage Vled, so as to keep the difference of the input voltage and the output voltage constant or approximately constant. The regulator may comprise a switch 201, an inductor 202, a rectifier diode 203 and a capacitor 204. The switch may be a FET. The load may be an LED. The object of the invention is to keep the on-time of switch constant or approximately constant even though the load is variable.</p> |
