Patent ID: 8358084
Filing Date: 2013-01-22
Classification: H05B,Y02B

Abstract:
1. A light emitting diode (LED) current control circuit, comprising: a current adjusting unit having a current control end coupled to an LED string, and the current adjusting unit determining an amount of a current flowing through the LED string according to a current control signal; a detecting unit detecting the current control end for determining whether to generate a protecting signal according to a protecting voltage value; a current control unit generating the current control signal to control the amount of the current of the LED string, and the current control unit determining whether to stop the current flowing through the LED string according to the protecting signal; and a voltage clamping unit coupled to the current control end, so that a voltage of the current control end is not higher than a clamping voltage value, wherein the clamping voltage value is higher than the protecting voltage value.