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MBCM270F450M270A00 - MBCM270T450M270A00
12.0 CURRENT SHARING
The SAC TM 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 a positive
temperature coefficient series resistance.
This type of characteristic is close to the impedance
characteristic of a DC power distribution system, both in
dynamic (AC) behavior and for steady state (DC) operation.
When multiple BCM modules of a given part number are
connected in an array they will inherently share the load
current according to the equivalent impedance divider that the
system implements from the power source to the point of load.
Some general recommendations to achieve matched array
impedances include:
? Dedicate common copper planes within the PCB
to deliver and return the current to the modules.
? Provide as symmetric a PCB layout as possible among modules
? Apply same input / output filters (if present) to each unit.
For further details see AN:016 Using BCM? Bus Converters
in High Power Arrays .
13.0 FUSE SELECTION
In order to provide flexibility in configuring power systems
V ? I Chip TM products are not internally fused. Input line fusing
of V ? I Chip products is recommended at system level to
provide thermal protection in case of catastrophic failure.
The fuse shall be selected by closely matching system
requirements with the following characteristics:
? Current rating (usually greater than maximum current
of BCM module)
? Maximum voltage rating (usually greater than the maximum
possible input voltage)
? Ambient temperature
? Nominal melting I 2 t
? Recommended fuse: ≤ 2.5 A Bussmann PC-Tron or
SOC type 36CFA.
14.0 REVERSE OPERATION
BCM modules are capable of reverse power operation. Once
the unit is started, energy will be transferred from secondary
back to the primary whenever the secondary voltage exceeds
V IN ? K. The module will continue operation in this fashion for
as long as no faults occur.
The MBCM270F450M270A00 has not been qualified for
continuous operation in a reverse power condition.
Vin
Z IN_EQ1
BCM1
R 0_1
Z OUT_EQ1
Vout
Furthermore fault protections which help protect the module in
forward operation will not fully protect the module in reverse
operation.
Transient operation in reverse is expected in cases where there
+ DC
Z IN_EQ2
BCM2
R 0_2
Z OUT_EQ2
Load
is significant energy storage on the output and transient
voltages appear on the input. Transient reverse power
operation of less than 10 ms, 10% duty cycle is permitted and
has been qualified to cover these cases.
Z IN_EQn
BCMn
Z OUT_EQn
R 0_n
Figure 17 – BCM TM module array
Rev. 1.1
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
1/2011
Page 15 of 19
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