Failure analysis of long-distance power supply for a DC-DC converter micro-module

A failure analysis of long-distance power supply system is presented in this paper. DC-DC converter module integrates the converter chip, feedback resistors, bypassing capacitors and storage diode together into a small metal package. During the power on period, the power transistor is broken by the transient peak through a wire of almost 100m is required by the higher level systems. To solve the problem, large capacitor, TVS devices and enable delaying technique are employed. The performance and efficiency for different solutions are compared and discussed, and the best solution is achieved.