The proposed high-efficient WLED driver using light-balanced-controlled techniques with current-locked loops is presented in this paper. This LED driver has 500:1 current sensing ratio and 1 kHz PWM dimming frequency. The maximum output current of the buck converter is 100 mA and the output voltage range is from 3.5 to 4.8 V with a 20 and 18 μH off-chip capacitor and inductor, respectively. The maximum efficiency of the proposed LED driver is 87.8 % and the current difference between each LED string is 1.33 %. And it is fabricated with TSMC 0.35 μm 2P4 M CMOS processes. The chip area is 1.52 mm × 1.36 mm.
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机译：本文提出了一种采用带电流锁环的光平衡控制技术的高效WLED驱动器。该LED驱动器具有500：1的电流感应比和1 kHz的PWM调光频率。降压转换器的最大输出电流为100 mA，输出电压范围为3.5至4.8 V，分别具有20和18μH的片外电容器和电感器。建议的LED驱动器的最大效率为87.8％，每个LED串之间的电流差为1.33％。并采用台积电0.35μm2P4 M CMOS工艺制造。芯片面积为1.52毫米×1.36毫米。
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