【选型】国产可控精密稳压源SGM431XK3G/TR可pin-pin替代TI TL431AIPK，具有更低温漂

时间： 2019-11-30 来源：SGMICRO

技术问答

工程师在LED驱动电源设计中，通常会用TI公司的可控精密稳压源TL431来设计恒流电路，其原理是利用TL431的2.5V基准电压作为参考电压做恒流，只要采样电阻精度高，就能达到高精度恒流，简单的TL431恒流电路如下图1所示。

图1：TL431恒流电路

不过随着受中美贸易战影响，不少厂家需要一款国产高性能芯片替代TI TL431AIPK，本文推荐圣邦微的可控精密稳压源SGM431XK3G/TR，能够Pin-pin替代Ti的TL431AIPK，两者电性能参数对比见图2。

图2：SGM431XK3G/TR与Ti的TL431AIPK电性能参数对比

通过以上参数对比，可知;

1、圣邦微的SGM431XK3G/TR与TI的TL431AIPK电性能参数基本一致；

2、SGM431XK3G/TR有着更低的典型温度漂移、动态输出电阻和更高的工作温度，有利于提高系统稳定。

另外，SGM431XK3G/TR与TL431AIPK有着相同的封装SOT23-3，并且Pin脚顺序和定义完全相同，可以实现pin-pin替换，下图为两者封装pin脚对比图。

图3：SGM431XK3G/TR与TL431AIPK封装pin脚对比

除了以上电性能对比外，还有以下竞争优势：

1、国产可控精密稳压源，价格更有优势；

2、供货交期更好。

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SGM431 Precision Programmable Reference

型号- SGM431XK3G/TR,SGM431BXN3LG/TR,SGM431XN5G/TR,SGM431,SGM431XS8G/TR,SGM431BXK3G/TR,SGM431BXN5G/TR,SGM431B,SGM431XC6G/TR,SGM431BXS8G/TR,SGM431X,SGM431XN3LG/TR

数据手册 - SGMICRO - REV.A - MAY 2020 PDF 英文下载查看更多版本

找国产芯片替代TI的TL431AIPK，谢谢！

推荐圣邦微的SGM431XK3G/TR

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