期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 50, 期 5, 页码 1287-1298出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2015.2398855
关键词
Adaptive off-timer; automatic Delta V-o detection; burst-mode operation; predictive peak current control; reconfigurable; V-o-hopping
A cost-effective single-converter reconfigurable CMOS LED driver is proposed to accurately and adaptively bias RGB color LEDs. An automatic Delta V-O detection technique is developed to precisely detect the voltage difference between the red and green/blue LEDs regardless of the PVT variations. The fast V-o -hopping technique is also implemented to instantaneously adjust the output voltage level, achieving 198 nsN V-o-hopping speed on 0.35 mu m CMOS. This is at least one order faster than the state-of-the-arts. Predictive peak current control and burst-mode operation are employed for fast inductor current modulation and robust operation. The switching frequency is stabilized around 1 MHz by an adaptive off-timer for switching noise spectrum control. The proposed driver consumes 8.6 times less headroom power than its fixed-output counterparts. The performance has been verified by measurement results of a 0.35 mu m CMOS prototype.
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