bcm48bh120t120a00 Vicor Corporation, bcm48bh120t120a00 Datasheet - Page 13

• Manufacturer Part Number: bcm48bh120t120a00
• Description: Bcmtm Bus Converter
• Manufacturer: Vicor Corporation

7.0 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.
Figure 17 – BCM Array
v i c o r p o w e r. c o m
V•I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
BCM48BH120T120A00 - BCM48BH120M120A00
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
• to make the PCB layout as symmetric as possible
• to apply same input/output filters (if present) to each unit
deliver and return the current to the modules
Page 13 of 16
Rev. 2.0
12/10