电源调制驱动器的失效分析

Failure Analysis of a Power Modulation Driver

电源调制驱动器是保障电路系统脉冲式供电的常用IC产品,通过输出脉冲信号控制MOSFET的开关为电路系统供电。讨论了某电子设备中出现的电源调制驱动器失效现象。通过二极管导通测试和加电测试确定故障位置和失效情况,并对失效产品进行开帽和去层,更精准地定位故障位置。通过建立故障树并使用排除法对失效驱动器进行分析,确定其失效的主要原因。通过机理分析和故障复现,证明了之前故障定位的准确性和分析的正确性。最后,为防止类似失效情况的再次发生制定了相应的改进措施。经用户使用验证,故障问题得以解决。

The power modulation driver is a common IC product used to ensure the pulse power supply for circuit system.The switch of MOSFET is controled by the output pulse signal to provide pluse power supply for the circuit system.A failure phenomenon of the power modulator driver in an electronic equipment was discussed.The fault locations and failure situations were determined by the diode conduction test and the electrification test, and the fault locations were accurately located by de-cap and de-layer for the failure product.By establishing the fault tree and using the elimination method to analyze the failure driver, the main cause of its failure was determined.The accuracy of the previous fault localization and the correctness of the analysis are proved by mechanism analysis and fault reproduction.Finally, the corresponding improvement measures were made to prevent the reproduction of similar failure situations.It is proved by the user that the problem has been solved.