| 主权项 |
1. A start-up circuit, comprising:
voltage regulator and current source circuitry coupled to an input voltage rail, and configured to generate a first switch control signal having a voltage less than the input voltage rail; start-up switch circuitry comprising a switch coupled to the input voltage rail and configured to generate a start-up voltage based on, at least in part, the first switch control signal; and wherein the start-up switch circuitry is configured to generate the start-up voltage to have a predefined voltage level within a predetermined time period; and wherein the start-up switch circuitry is further configured to generate a first feedback signal indicative of the state of the start-up switch circuitry; and first controller circuitry configured to receive the first feedback signal and generate a second switch control signal; wherein the second switch control signal controls the conduction state of the switch to turn ON and OFF based on, at least in part, the first feedback signal; and wherein when the switch is turned ON the start-up switch circuitry generates the start-up voltage and when the switch is turned OFF the start-up circuitry discontinues the start-up voltage. |
