LED IC IC LED LED DRIVER IC AND LED PACKAGE WITH EMBEDDED DRIVER IC

摘要

The present invention relates to an LED driver IC capable of preventing a malfunction such as flickering of an LED in a low voltage signal and noise, and an LED package with a driver IC. The LED driver IC of the present invention includes at least one LED An LED driver IC (140) connected to the LED chip (130) for lighting and driving the LED, comprising: a current limiting resistor (R1) installed between a power supply terminal (210) and a resistance setting terminal (220); A protection circuit part 310 connected in series between a pair of TRs (Q1, Q2) biased in opposite directions to each other between the power supply terminal 210 and the ground terminal 240; A constant current circuit part 320 consisting of two stages TR (Q3, Q4) connected in parallel to the protection circuit part 310 between the power supply terminal 210 and the ground terminal 240 to constant current regulate the input power; (Q5) and a second switching transistor TR (Q6) turned on by the output of the constant current circuit 320. The first switching transistor TR5 is connected to the output terminal of the constant current circuit 320, A base terminal is connected and a collector terminal is connected to the ground terminal 240. The second switching transistor TR6 has a base terminal connected to the emitter terminal of the first switching transistor TR5, A switching circuit 330 having an emitter terminal connected to the LED chip 130 and a collector terminal connected to an output terminal for supplying driving power to the LED chip 130; And a resistor (R2) installed for setting a turn-on current of the first switching transistor (TR5) between the collector terminal of the first switching transistor TR (Q5) and the ground terminal 240, A first leakage current flowing between the emitter terminal and the collector terminal of the first switching TR (Q5) and a second leakage current flowing between the base terminal of the second switching transistor TR (Q6) and the collector terminal And the sum of the second leakage current due to the formed parasitic capacitance is set to 7 mA or more. According to the present invention, the switching circuit portion of the driver IC is constituted by the two-stage TR, and the collector terminal of the first switching transistor TR is connected to the ground terminal so that the combined leakage current of the first switching transistor TR and the parasitic TR The abnormal operation of the LED in the low voltage signal and the noise can be prevented and the abnormal operation can be prevented only by the configuration of the switching circuit without adding the noise filter or the resistor, .