Patent ID: 7825612

Claim:
A light emitting diode array driving apparatus for driving a light emitting array having a plurality of light emitting diodes connected to one another, comprising: a direct current-direct current converting part comprising: a first inductor having an input voltage applied to one end thereof; a first capacitor having one end connected to another end of the first inductor; a switching transistor having a drain connected to a connecting node between the first inductor and the first capacitor; a first diode having an anode connected to another end of the first capacitor and a cathode connected to the light emitting array; a second inductor having one end connected to a connecting node between the first capacitor and the first diode; and a second capacitor having one end connected to a connecting node between the first diode and the light emitting diode array; a current/voltage detecting part detecting a magnitude of a first current flowing through the switching transistor to correspondingly output a first current detection voltage, detecting a magnitude of a both-end voltage of the light emitting diode array to correspondingly output a light emitting diode array detection voltage, and detecting a magnitude of a current flowing through the light emitting diode array to correspondingly output a second current detection voltage; and a constant current controlling part controlling an on/off duty of the switching transistor according to the magnitude of the first current detection voltage, the second current detection voltage and the light emitting diode array detection voltage detected by the current/voltage detecting part.