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本文提出一种无电流调节元件(CRE)的降压-升压LED驱动器，利用误差平均的SenseFET电流检测技术直接调节LED电流，解决了传统驱动器因串联CRE导致的效率损失问题，实现了超过13%的效率提升。
significant efficiency loss due to the presence of a current regulation element (CRE) in series with the LED. In a conventional driver, either a series current source [1] or a sense resistor [2, 3] acts as a CRE to regulate the LED current (ILED). In this paper, we seek to improve the efficiency by eliminating the series CRE. To this end, we employ a highly accurate current sensing scheme to directly regulate ILED and achieve more than 13% efficiency improvement. Figure 13.2.1 shows the proposed CRE-less LED driver architecture. The converter output directly drives the LED and the feedback circuitry regulates ILED to the desired value. To achieve seamless operation over the entire Li-ion battery voltage range (3 to 5.5V), a buck-boost converter is employed. Efficiency is
Sachin Rao1, Qadeer Khan1, Sarvesh Bang2, Damian Swank2,
Arun Rao2, William McIntyre2, Pavan Kumar Hanumolu1 1 2 Oregon State University, Corvallis, OR National Semiconductor, Grass Valley, CA High-current LED drivers suffer from a