Industry White Papers

Negative Resistance and Why Your DC-DC Converter May Not Be Working Properly

September 13, 2021 by CUI Inc

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.