Patent ID: 8624513

Claim:
An apparatus, comprising: a first channel of first light emitting devices (LEDs) connected in series with each other; a second channel of second LEDs connected in series with each other, at least one of the second LEDs having at least one of a different color and a different color temperature than at least one of the first LEDs; and a driver for driving the first and second channels of LEDs, the driver including: a flyback converter configured to receive a first DC voltage and to output a second DC voltage, a buck converter configured to receive the second DC voltage and to generate an output voltage that causes a first current to flow through the first channel of LEDs and a second current to flow through the second channel of LEDs, a pulse width modulator configured to control the second current flowing through to the second channel of LEDs in response to a control signal, wherein the control signal for controlling the second current flowing through the second channel of LEDs is produced from an inductor winding in one of the flyback converter and the buck converter, and a feedback device configured to sample at least one of the first current and the second current and in response thereto to control a switching operation of the buck converter.