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VTM 48 E x 040 y 050A00
14.0 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 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 the same K factor, the VTM
module will inherently share the load current (typically 5%)
with parallel units 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:
? Dedicate common copper planes within the PCB
to deliver and return the current to the modules.
? Provide the PCB layout as symmetric as possible.
? Apply same input / output filters (if present) to each unit.
For further details see AN:016 Using BCM? Bus Converters
in High Power Arrays .
16.0 REVERSE OPERATION
The VTM48EF040T050A00 is capable of reverse operation.
If a voltage is present at the output which satisfies the
condition V OUT > V IN ? K at the time the VC voltage is applied,
or after the unit has started, then energy will be transferred
from secondary to primary. The input to output ratio will be
maintained. The VTM48EF040T050A00 will continue to
operate in reverse as long as the input and output are within
the specified limits. The VTM48EF040T050A00 has not been
qualified for continuous operation (>10 ms) in the reverse
direction.
V IN
Z IN_EQ1
VTM1
Z OUT_EQ1
V OUT
R O_1
Z IN_EQ2
VTM2
R O_2
Z OUT_EQ2
+
–
DC
Load
Z IN_EQn
VTMn
Z OUT_EQn
R O_n
Figure 17 – VTM TM current multiplier array
15.0 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 VTM module)
? Maximum voltage rating (usually greater than the maximum
possible input voltage)
? Ambient temperature
? Nominal melting I 2 t
Rev. 3.2
V?I CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
2/2011
Page 14 of 18
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