一款单线传输LED恒流驱动芯片的设计

Design of a single-line transmission LED constant current driver chip

设计了一款三通道单线传输LED恒流驱动芯片,芯片具有三路PWM驱动端口,实现256级灰度输出。芯片内部集成的关键电路包括三部分,即数据提取电路、数据处理电路、下级数据重建电路。在级联工作时,首颗芯片对多组输入数据流进行数据提取与处理,将第一组数据截取,经处理后送至驱动端口,同时将其余数据正确地传递到下一颗芯片。经仿真,芯片在传输速率为800 kb/s时,传输特性稳定。

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.