Patent ID: 9131553
Filing Date: 2015-09-08
Classification: H05B

Abstract:
1. A light-emitting diode (LED) driver, comprising: a) a soft-start control circuit, wherein when a first threshold value is less than a soft-start reference value, said LED driver is configured to operate in a soft-start process, wherein said soft-start reference value represents a desired output current of said LED driver, and wherein an inductor current of said LED driver is no greater than a second threshold value; b) wherein during a first time interval of said soft-start process, an LED driving current is configured to be maintained at a first current value, and an LED driving voltage rises in a slope-shape, wherein said first threshold value is maintained at a corresponding initial soft-start value of said first current value, and said second threshold value rises in a slope-shape; c) wherein during a second time interval of said soft-start process, said LED driving current is configured to rise in a slope-shape, and said LED driving voltage is configured to be maintained at an end state of said first time interval, wherein said first threshold value continues to rise in a slope-shape, and reaches a first final value at an end of said second time interval, and wherein said second threshold value is maintained at a second final value; and d) when said first threshold value is greater than said soft-start reference value, said LED driver is configured to operate in a normal operating state, and said LED driving current is substantially consistent with said desired output current.