Distributed power architectures (DPA) replace multiple central power sources with a single bulk supply that is converted to the end-use voltages by DC-DC converters located at the point of need. This application note discusses the use of DPA.
DC-DC converters are natural generators of input narrowband spectral noise currents having components at the fundamental switching frequency and higher order harmonics. The low noise of Interpoint converters can be lowered even further.
The inhibit function allows shutdown of the DC-DC converter without interrupting the connection to the input powerbus. The synchronization function allows the converter to be synchronized to an external clock or other devices.
In order to determine if an external output filter is needed for a DC-DC converter, an understanding of the nature of output noise and its proper measurement will be helpful. Differential mode (DM) and common mode (CM) noise are discussed.
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