Multi-string dimmable LED driver

摘要

An apparatus includes a first LED driver configured to control a first string of LEDs, a second LED driver configured to control a second string of LEDs, a third LED driver configured to control a third string of LEDs, and a control circuit configured to receive a control signal and to control the first, second, and third LED drivers so that the first, second, and third strings of LEDs cooperate in producing light according to the control signal and a color curve.

主权项

1. An apparatus, comprising:
a first LED driver configured to control a first string of LEDs; a second LED driver configured to control a second string of LEDs; a third LED driver configured to control a third string of LEDs; and a control circuit configured to receive a control signal and to control the first, second, and third LED drivers so that the first, second, and third strings of LEDs cooperate in producing light according to the control signal and a color curve stored in a color curve circuit of the control circuit, wherein the control circuit is configured to control each of the first and second LED drivers in a Pulse Width Modulation (PWM) mode configured to control duty cycles of currents of the respective strings of LEDs and in a linear mode configured to control magnitudes of the currents, and wherein the control circuit is operable to simultaneously control the first LED driver in the PWM mode and the second LED driver in the linear mode.