基于MAX6126的仪用精密恒流源设计

为了满足仪器中光源发光稳定性的要求，根据物质分析仪器中所采用光源的特点，研制出一种基于精密电压基准MAX6126的恒流源。该恒流源不但能够为光源提供恒定电流，而且可以根据实际要求实现不同光源的轮流发光。同时介绍MAX6126的主要技术参数指标和引脚排列。实验部分以驱动4个光源的恒流源为例，在200min内每隔10min对4个光源的发光强度检测采集，4个光源发光强度的标准差分别为0.004V、0.002V、0.014V和0.008V，该恒流源能够在长时间内保持很好的稳定性。

Design of precision constant current source used in instruments based on MAX6126

In order to match the stability requirement of instrument light source,and according to the characters of material analysis instrument light source,a constant current source based on precision voltage reference MAX6126 is proposed,which is stable and simple.It can not only provide constant current for light source,but also achieve different light sources radiat-ing by turns.And the main technical parameters and chip pin definitions of MAX6126 are introduced.An experiment is ar-ranged,in which the constant c...