Abstract
The red-green-blue light-emitting diode (RGBLED) driver with adaptive driving voltage and energy-saving (ADVE) technique is presented in this paper. To obtain the proper driving voltage, a dynamic output voltage selector is proposed. This approach tracks the reference voltage of a boost converter to achieve the appropriate output voltage of the boost converter. Hence, the power loss of the linear current regulator is reduced to improve the efficiency of whole system. Moreover, the chip area is saved by the proposed switching linear current regulator. This chip was fabricated using TSMC 0.35 μm 2P4M complementary metal-oxide-semiconductor (CMOS) technology. The active chip area is 0.3 mm2. The maximum driving current and operating frequency are 100 mA and 100 kHz, respectively. Compared with a conventional LED driver with fixed output voltage, the experimental results demonstrate that the power loss of the proposed LED driver with ADVE technique is reduced by over 58%.
Highlights
Light emitting diodes (LEDs) have been widely used in lighting and backlight units (BLUs) due to their long lifespan, high reliability, good gamut, and energy efficiency [1,2,3,4,5]
Compared with a conventional LED driver with fixed output voltage, the experimental results demonstrate that the power loss of the proposed LED driver with ADVE technique is reduced by over 58%
This paper presents an red-green-blue light-emitting diode (RGBLED) driver with the ADVE technique
Summary
Light emitting diodes (LEDs) have been widely used in lighting and backlight units (BLUs) due to their long lifespan, high reliability, good gamut, and energy efficiency [1,2,3,4,5]. Each LED probably has a different forward voltage due to the process variation, use time, and environmental temperature [21,22] This phenomenon leads to redundant voltages across linear current regulators. Redundant voltage across linear current regulators leads to additional power loss. To minimize the voltage across linear current regulators, adaptive voltage control was introduced (Figure 5) [24,25,26,27,28,29].
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