中圖分類號： TN432 文獻(xiàn)標(biāo)識碼： A DOI：10.16157/j.issn.0258-7998.200043 中文引用格式： 呂思葓，馮全源. 一款單線傳輸LED恒流驅(qū)動芯片的設(shè)計[J].電子技術(shù)應(yīng)用，2020，46(8)：83-87. 英文引用格式： Lv Sihong，F(xiàn)eng Quanyuan. Design of a single-line transmission LED constant current driver chip[J]. Application of Electronic Technique，2020，46(8)：83-87.
Design of a single-line transmission LED constant current driver chip
Lv Sihong，F(xiàn)eng Quanyuan
Institute of Microelectronics，Southwest Jiaotong University，Chengdu 611756，China
Abstract： A three-channel single-line transmission LED constant current driver chip is designed. The chip has three PWM driver ports to achieve 256-level grayscale output. The key circuit integrated in the chip includes three parts, a data extraction circuit, a data processing circuit, and a lower-level data reconstruction circuit. During cascade work, the first chip performs data extraction and processing on multiple sets of input data streams, retains the first set of data, sends it to the driver port after processing, and simultaneously transfers the remaining data to the next chip correctly. After simulation , the chip has stable transmission characteristics at a transmission rate of 800 kb/s.
Key words : LED drive；single-line transmission；chip cascade
