Patent ID: 9408265
Filing Date: 2016-08-02
CPC Classification: H05B,Y02B

Claim Text:
1. A multichannel constant current light-emitting diode (LED) driving circuit configured to drive a plurality of LED strings, the LED driving circuit comprising: a) a power stage circuit having a power switching transistor, an inductor, and a rectifier circuit, wherein said power stage circuit is configured to receive a DC bus voltage, and to generate a pseudo-constant output signal to drive said plurality of LED strings; b) a current control unit configured to control an average current of each of said plurality of LED strings in accordance with a corresponding one of a plurality of dimming signals; and c) said current control unit being configured to control said power switching transistor in accordance with a current feedback signal that represents a current flowing through said LED strings, wherein said plurality of LED strings are coupled in series to receive said pseudo-constant output signal.