Patent ID: 9622305
Date: 2017-04-11
CPC Classifications: H05B,Y02B

Claim:
1. A White Light Emitting Diode (WLED) driver, comprising: N channels, wherein N is a positive integer that is greater than 1, and each channel comprises a current sink (CS) module configured to drive a WLED string, wherein each CS module comprises an error amplifier (EA), an n-type metal-oxide-semiconductor (NMOS) transistor, and a feedback resistor; at least 2N a boost converter configured to regulate an output voltage of the WLED driver according to a maximum quantity of WLEDs in a WLED string corresponding to any channel; wherein one end of each of N switches in the 2N switches comprised in the CS module is connected to an output end of the error amplifier, another end of each of the N switches is connected to a gate of each of N NMOS transistors, one end of each of remaining N switches is connected to a negative input end of the error amplifier, another end of each of the remaining N switches is connected to a positive input end of each of N feedback resistors, and the CS module is configured to determine an intensity of a current flowing through the WLED string corresponding to the channel; and a control circuit configured to generate a clock signal group Φ