基于 XTR110的高精度恒流源设计

摘要

A design scheme for high-precision constant-current source was introduced and its working principle and formula derivation were analyzed.Taking 80mA constant-current source which boasting of a 0.1 % preci-sion as an example,the element selection in circuit was illustrated.Testing the performance of the 80mA con-stant current source shows that,powered by 24V power at 0 ~270Ω load resistance,the output current has better stability together with 0.022% accuracy higher than the 0.1 %required.%介绍了一种基于 XTR110的高精度恒流源设计方案，详细分析了电路的工作原理与公式推导，并以设计0．1％精度的80mA 恒流源进行举例说明，对实际电路中元器件的选取进行了说明解释，同时对所设计的80mA 恒流源进行测试试验。测试结果表明：该恒流源在工业常用24V 供电、负载0～270Ω范围内，输出电流稳定性好，精度可达0．022％，远高于试验要求精度0．1％。