Patent ID: 8471499

Claim:
A light emitting diode (LED) driver, comprising: a light emitting diode; a converter connected to the light emitting diode, wherein the converter receives an input voltage and converts the input voltage to a voltage for driving the light emitting diode; a current regulator connected to the light emitting diode; a first operational amplifier connected to the current regulator; an analog dimming voltage generating unit connected to the first operational amplifier, the analog dimming voltage generating unit comprising a second operational amplifier, a first resistor, a second resistor, and a third resistor, wherein a first terminal of the first resistor, a first terminal of the second resistor, and a first terminal of the third resistor are connected to a non-inversion terminal of the second operational amplifier; and a pulse-width-modulation dimming pulse generating unit connected to a second terminal of the third resistor.