Datenblatt-Suchmaschine für elektronische Bauteile |
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BC352R440T065VM-00 Datenblatt(PDF) 9 Page - Vicor Corporation |
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BC352R440T065VM-00 Datenblatt(HTML) 9 Page - Vicor Corporation |
9 / 10 page APPLICATIONS NOTE VI BRICK BCM Array BC352R440T065VM-00 vicorpower.com Rev. 1.0 Page 9 of 10 CURRENT SHARING The SAC topology bases its performance on efficient transfer of energy through a transformer, without the need of closed loop control. For this reason, the transfer characteristic can be approximated by an ideal transformer with some resistive drop and positive temperature coefficient. This type of characteristic is close to the impedance characteristic of a DC power distribution system, both in behavior (AC dynamic) and absolute value (DC dynamic). When connected in an array (with same K factor), the BCM module will inherently share the load current with parallel units, according to the equivalent impedance divider that the system implements from the power source to the point of load. It is important to notice that, when successfully started, BCMs are capable of bidirectional operations (reverse power transfer is enabled if the BCM input falls within its operating range and the BCM is otherwise enabled). In parallel arrays, because of the resistive behavior, circulating currents are never experienced, because of energy conservation law. General recommendations to achieve matched array impedances are (see also AN016 for further details): • to dedicate common copper planes within the PCB to deliver and return the current to the modules • to make the PCB layout as symmetric as possible • to apply same input/output filters (if present) to each unit Figure 16 – BCM Array |
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