电子与封装2025，Vol.25Issue(4)：31-38,8.DOI:10.16257/j.cnki.1681-1070.2025.0041
军用DC/DC电源模块失效分析研究
Failure Analysis Study of Military DC/DC Power Module
李鹏 1张竹风 1王自成 1刘红 1赵国发1
作者信息
- 1. 西安现代控制技术研究所,西安 710065
- 折叠
摘要
Abstract
Aiming at the abnormal output problem of two DC/DC power modules in the process of developing a weapon system,the failure mechanism is studied through the formulation of a failure analysis scheme.Visual inspection of the failed modules shows varying degrees of insulator breakage in each pin.Electrical performance and Ⅰ-Ⅴ characteristic curves are tested and compared with the qualified samples,and it is found that there are abnormal diode characteristics and connectivity between Pin3 and Pin5 of the two failed modules respectively,and the failure sites are preliminarily determined.The internal substrates and lead frames of the modules are examined by X-ray testing equipment,and it is found that the bonding wires of two VDMOS chips in module 1 are broken,and the cross section is like a melting ball.The modules are further physically opened for internal inspection,and the discoloration caused by high temperature in the middle of VDMOS chips in module 1 and the obvious cracks in the weld point of the pins in module 2 are observed.The causes of failure are investigated and analyzed,and the results show that the overstress at the power supply terminal causes the VDMOS burnout of module 1 and the bad welding causes the output abnormality of module 2.关键词
DC/DC电源模块/失效分析/VDMOS烧毁/焊接不良Key words
DC/DC power module/failure analysis/VDMOS burnout/bad welding分类
电子信息工程引用本文复制引用
李鹏,张竹风,王自成,刘红,赵国发..军用DC/DC电源模块失效分析研究[J].电子与封装,2025,25(4):31-38,8.
