Common faulty of DC/DC switching power supply mode Different suppliers launch a variety of different DC/DC switching power supply mode in the market at present, different products input voltage, output power, founctions and topology structure are different. Its characteristic is to application-specific integrated circuit (ASIC), digital signal processor (DSP), microprocessor, memory, field programmable gate array (FPGA), and other digital or analog load power supply. The reliability of power supply module is higher, but also may be down, generally the possibility of failure has the following kinds in DC - DC switching power supply module: 1, reduce the output voltage when using the dc dc module 2, module stop work; 3, module output voltage is too high; 4, module input short circuit 5, module output current is too large.