Patent ID: 8988004
Filing Date: 2015-03-24
Classification: H05B,Y10T

Abstract:
1. A method of forming an LED current controller comprising: forming a first current control cell to receive a first LED current from a first LED branch, the first LED branch having a first voltage drop across the first LED branch; forming a second current control cell to receive a second LED current from a second LED branch having a common connection in a pseudo-parallel configuration with the first LED branch, the second LED branch having a second voltage drop across the second LED branch; forming the LED current controller to determine a larger one of the first or second voltage drops and responsively select one of the first or second LED currents, respectively, and to form a control current that is ratioed to the one of the respective first or second LED currents; and forming the first and second current control cells to regulate another of the first and second LED currents to be ratioed to the control current.