LED LED driver with auto-dimming

摘要

The present invention relates to an LED driving circuit. According to an aspect of the present invention, an auto dimming LED driving circuit is provided. The auto dimming LED driving circuit includes a DC voltage generating unit that generates a first DC voltage and a second DC voltage using an input voltage generated by half-wave rectification of an AC power source, and a second DC voltage generating unit that is operated by the second DC voltage, A frequency divider that operates by the second DC voltage and divides the main clock to output an operation clock related to an auto dimming level, a frequency divider that divides the main clock and outputs an operation clock related to the auto dimming level, An auto dimming and DC level control unit for generating a reference voltage and outputting the plurality of reference voltages sequentially according to the operation clock; and an auto-dimming and DC level control unit operating with the second DC voltage and using the plurality of reference voltages sequentially outputted And an LED driver for controlling the amount of current applied to the plurality of LEDs.