摘要
对CAN总线隔离收发器失效问题进行了研究,并利用分析手段对失效机理展开研究.CAN总线隔离收发器装机后在进行可靠性增长试验115 h时出现失效,失效现象是产品的CANH与CANL之间有信号,但是接收与发送端口无信号,不能进行正常的通讯.内部目检和X光检查后发现三极管Q1和Q2异常.通过失效分析,证明由于三极管Q1处焊点完全断开后,加重三极管Q2的功率负担,出现烧毁,导致器件失效.故障排查后证明由于器件公用焊盘的问题,焊接时间不足,在2秒内没有完成焊接又未进行复焊导致.对失效理论进行分析和器件故障复现后,进一步证明该CAN总线隔离收发器失效机理.
The failure of CAN bus isolation transceiver was studied,and the failure mechanism was studied by means of analysis.After the CAN bus isolation transceiver was installed,it failed during the reliability growth test for 115 h.The failure phenomenon was that there was a signal between the CANH and CANL of the product,but there was no signal at the receiving and transmitting ports,so normal communication cannot be carried out.After internal visual inspection and X-ray inspection,abnormal transistor Q1 and Q2 were found.Through failure analysis,it was proved that after the solder joint at transistor Q1 is completely disconnected,the power burden of transistor Q2 was increased and the device was burnt out,resulting in device failure.After troubleshooting,it was proved that due to the problem of the common pad of the device,the welding time was insufficient,and the welding was not completed and rewelded within 2 s.After analyzing the failure theory and reproducing the device failure,the failure mechanism of the CAN bus isolation transceiver is further proved.
作者
吴元庆
王婷
周涛
刘春梅
Wu Yuanqing;Wang Ting;Zhou Tao;Liu Chunmei(School of Physical Science and Technology,Bohai University,Jinzhou 121013,China)
出处
《南开大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第4期44-49,55,共7页
Journal of Nankai University(Natural Sience)
基金
国家自然科学基金(61575029)。
