Input Source Impedance and its Effects on DC-DC Converters

October 22, 2009
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Understanding input source impedance in DC-DC converter designs helps to ensure correct damping and stable operation. A detailed examination of the input impedance of a switch-mode DC-DC converter reveals why it is common practice to use a large electrolytic capacitor across the input to a DC-DC converter, and make input source impedance smaller than the input impedance to the converter.

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