Light emitting diode driver systems and associated methods of control

摘要

Light emitting diode (LED) dimming and driver systems and associated methods of control are disclosed herein. In one embodiment, a system comprises a PFC stage and an LED driver stage. The LED driver stage comprises an isolated converter and a controller responsive to a dimming signal to dim LED strings for backlight. The controller also regulates an output current of the isolated converter.

主权项

1. A light-emitting diode (LED) driver system comprising:
a power factor correction stage having an input and an output; an isolated voltage converter driver stage having an isolated voltage converter, wherein an input of the isolated voltage converter driver stage is coupled to the output of the power factor correction stage; and an LED string, comprising one or more LED diodes in series, wherein an output of the isolated voltage converter driver stage is directly coupled to the LED string to provide power to the LED string; wherein the isolated voltage converter driver stage further comprises a controller and the isolated voltage converter comprises a primary side switch at a primary side of the isolated voltage converter driver stage, and wherein the controller is coupled to the primary side switch to provide a control signal for controlling the isolated voltage converter, and wherein the controller is further coupled to the LED string to provide a dimming signal for dimming the LED string.