Patent ID: 11343891

Abstract:
Provided is an LED system for vehicle lighting, the LED system including: an LED package (10) including a first LED chip (11) and a second LED chip (12); and an external transistor (20) provided outside the LED package (10), and connected to a main current channel of the LED package (10) in series, wherein the driving circuit (13) is configured to drive only the first LED chip (11) with a first constant current when a level of an input voltage is lower than that of a reference voltage, or drive the first LED chip (11), the second LED chip (12), and the external transistor (20) with a second constant current when the level of the input voltage is higher than that of the reference voltage, wherein the driving circuit (13) controls the first constant current and the second constant current such that power of the first LED chip (11) when only the first LED chip (11) is driven is the same as power of the first LED chip (11) and the second LED chip (12) when all the first LED chip (11), the second LED chip (12), and the external transistor (20) connected to each other in series are driven.