用于智能调光的多通道高精度电流匹配LED驱动器

2015 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS) Pub Date : 2015-11-01 DOI:10.1109/ISPACS.2015.7432760

Poki Chen, Hsien-Chih Liu, Ya-Wen Yang, Ya-Ying Li, F. Budiman

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引用次数: 2

摘要

本文提出了一种具有精确电流匹配功能的LED驱动器。通过巧妙的布局方案，实现了精确匹配的LED电流，并具有对工艺、温度和电压(PVT)变化的高容忍度。即使使用高压mosfet, LED通道之间的最大电流失配也仅为-0.385%~0.372%，几乎比传统通道好一个数量级。该电路的温度系数低至20ppm/°C，在-40°C ~125°C范围内，20mA LED驱动电流。该电路采用TSMC 0.25μm 1P3M工艺制作，芯片尺寸为1.15*1.9mm2。

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A multi-channel high precision current matching LED Driver for intelligent dimming

In this paper, a LED Driver with precise current matching is proposed. Through the help of artful layout schemes, the accurately matched LED currents are achieved with high tolerance to process, temperature and voltage (PVT) variations. Even with high voltage MOSFETs, the maximum current mismatch among LED channels is measured to be merely -0.385%~0.372% which is almost one-order better than those of the conventional ones. The temperature coefficient of this circuit is as low as 20ppm/°C over -40°C ~125°C range for 20mA LED driving current. This circuit was fabricated in TSMC 0.25μm 1P3M process with a chip size of 1.15*1.9mm2.

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2015 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

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