CUI is now part of Bel
In some applications the use of a single power supply may not be su cient to provide the power required by the load. The reasons for using multiple supplies may include redundant operation to improve reliability or increased output power. When providing combined power, care must be taken to ensure power is delivered in a balanced manner by all of the supplies.
If your DC-DC converter is not working and you’ve checked the obvious issues (not plugged in, not turned on, input fuse blown, etc.) the issue might be input impedance caused by negative resistance. A common solution is to either ac couple a resistance into the circuit or dc block the resistance from the circuit. This can be accomplished by placing the right capacitor as close as is reasonable to the input pins of the dc- converter.