NOVEL LED DRIVER CIRCUIT

PROBLEM TO BE SOLVED: To provide a novel LED driver circuit including a low-cost component for adjusting load voltage.SOLUTION: An LED driver circuit comprises: a current adjusting circuit; a transistor; a bias network; and an LED module. The LED module has at least two connection nodes. The connection node at one end is coupled with a line voltage, and the connection node at the other end is coupled with a first end of the transistor. One of the at least two connection nodes is coupled with a first end of the bias network. The voltage difference between a first end and a second end of the current adjusting circuit is generated in accordance with first current so that the voltage difference increases and decreases when the first current decreases and increases, respectively.