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VTM48EX480Y006A00 데이터시트(PDF) 14 Page - Vicor Corporation

부품명 VTM48EX480Y006A00
상세설명  High Efficiency, Sine Amplitude Converter
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제조업체  VICOR [Vicor Corporation]
홈페이지  http://www.vicorpower.com
Logo VICOR - Vicor Corporation

VTM48EX480Y006A00 데이터시트(HTML) 14 Page - Vicor Corporation

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VTM® Current Multiplier
Rev 1.3
vicorpower.com
Page 14 of 18
07/2015
800 927.9474
480 006A00
y
E
48
VTM
x
VIN
VOUT
+
DC
ZIN_EQ1
ZIN_EQ2
ZOUT_EQ1
ZOUT_EQ2
Load
VTM®1
RO_1
VTM®2
RO_2
VTM®n
RO_n
ZOUT_EQn
ZIN_EQn
Figure 17 — VTM module array
14.0 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 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.
15.0 FUSE SELECTION
In order to provide flexibility in configuring power systems
VI Chip® products are not internally fused. Input line fusing
of VI 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 I2t
16.0 REVERSE OPERATION
The VTM48EF480T006A00 is capable of reverse operation.
If a voltage is present at the output which satisfies the
condition VOUT > VIN 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 VTM48EF480T006A00 will continue to
operate in reverse as long as the input and output are within
the specified limits. The VTM48EF480T006A00 has not been
qualified for continuous operation (>10 ms) in the reverse
direction.


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