PRELIMINARY
45
V•I Chip
VIC-in-a-Brick
TM
Intermediate Bus Converters
Quarter-Brick, 48 Vin Family
3 to 48 Vdc Bus Voltages; 100 A - 600 W Output
V•I
Features
• Up to 600 W
• 95% efficiency @ 3 Vdc
• 600 W @ 55ºC, 400 LFM
• 125°C operating temperature
• 400 W/in
3
power density
• 38-55 Vdc input range
• 100 V input surge for 100 ms
• SAC topology
• Low noise ZCS/ZVS architecture
• 3.5 MHz switching frequency
• Fast dynamic response
• Parallelable, with fault tolerance
• 2,250 Vdc basic insulation
+ +
–
K
–
©
Absolute Maximum Ratings
Product Overview
These "VIC-in-a-Brick" Intermediate Bus
Converter (IBC) modules use Vicor’s
V•I Chip Bus Converter Modules (BCM)
to achieve the highest performance for
Intermediate Bus Architecture applications.
Operating from a 38-55 Vdc input, ten
different fixed ratio outputs are available
from 3 to 48 Vdc. You can choose the
intermediate bus voltage that is optimal for
your system and load requirements.
These quarter-bricks are available with a
single BCM, rated up to 300 W or 70 A, or
with dual BCMs, capable of 600 W or 100 A.
Dual output pins are used for output
currents over 50 A.
Utilizing breakthrough Sine Amplitude
Converter (SAC) technology, BCMs offer
the highest efficiency, lowest noise, fastest
transient response and highest power
density. And full load power is available at
55ºC with only 200 LFM of air for single
BCM versions and 400 LFM for dual BCM
versions, without a heatsink.
Parameter
+In to –In voltage
Continuous
Surge
PC to –In voltage
Isolation voltage
Input to output
In/Out to heat sink
Operating temperature
Pin soldering temperature
Wave
Hand
Rating
-1.0 to +60.0
100
-0.3 to +7.0
2,250
1,500
-40 to +125
500 (260)
750 (390)
Unit
Vdc
Vdc
Vdc
Basic Insulation
Vdc
Vdc
°C
°F (°C)
°F (°C)
Junction
<5 sec
<7 sec
Notes
<100ms
Thermal Resistance and Capacity
Parameter
VIC to ambient; 0 LFM (Single BCM)
VIC to ambient; 0 LFM (Dual BCM)
VIC to ambient; 200 LFM (Single BCM)
VIC to ambient; 200 LFM (Dual BCM)
Thermal capacity (Single BCM)
Thermal capacity (Dual BCM)
Typ
13.3
11.7
6.1
4.3
14.3
22.8
Unit
°C/W
°C/W
°C/W
°C/W
Ws/°C
Ws/°C
Vicor Corporation
Tel: 800-735-6200 vicorpower.com
Factorized Power
Quarter-Brick Intermediate Bus Converters
Rev. 1.3
Page 1 of 8
PRELIMINARY
ELECTRICAL CHARACTERISTICS
For comprehensive data on any of the configurations, please refer to the data sheet for the BCM with output voltage (K Factor) of
the Intermediate Bus Converter of interest. Data sheets are available from our website at www.vicorpower.com.
Electrical characteristics apply over the full operating range of input voltage, output load (resistive) and case temperature,
unless otherwise specified.
INPUT SPECIFICATIONS
Parameter
Operating input voltage
Input surge withstand
Undervoltage
Turn-on
Turn-off
Overvoltage
Turn-off
Turn-on
Input reflected ripple current
Input dV/dt
Turn-on time
Power up
PC enable
No load power dissipation
Recommended external
input capacitance
10
300
50
2.5
50
36.1
33.8
Min
38
Typ
48
Max
55
100
38
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
% Iin
10
V/µs
ms
µs
W
µF
per BCM
200 nH maximum source inductance
mA p-p with recommended external input capacitor
Notes
12 V 200 W & 400 W units are 42–53 Vdc
<100ms
32.6
55.0
59
3
OUTPUT SPECIFICATIONS
Parameter
Output voltage accuracy
Peak repetitive output current
Current limit
Average short circuit current
Efficiency
Output OVP setpoint
Line regulation
Load regulation
Temperature regulation
Ripple and noise, p-p
Switching frequency
Power sharing accuracy
Transient response
Voltage deviation
Response time
Recovery time
±0.05
100
3.5
±5
2
200
1
±10
% / °C
mV
MHz
%
%
ns
µs
48 Vin; full load; 20 MHz bandwidth
Fixed
10 to 100% load
No load - full load step change, see note 2 below
125
200
96.0
120
Min
Typ
±2
150
Max
Unit
%
%
%
mA
%
%
Fixed ratio; Vout = Vin•K (see product matrix)
∆Vout
=
∆Iout•Rout
(see product matrix)
48 Vin; full load; 25°C
Notes
48 V input; no load; 25°C
<1 ms; see note 2 below
See note 1 below
Note 1: Current limit parameter does not apply for all models. Please see product matrix on page 2 for exceptions.
Note 2: For important information relative to applications where the unit is subjected to continuous dynamic loading, contact Vicor
applications engineering at 800-927-9474.
Vicor Corporation
Tel: 800-735-6200 vicorpower.com
Factorized Power
Quarter-Brick Intermediate Bus Converters
Rev. 1.3
Page 3 of 8
PRELIMINARY
PIN/CONTROL FUNCTIONS
+IN / –IN — DC Voltage Input Pins
The "VIC-in-a-Brick" Intermediate Bus Converter (IBC) input
voltage range should not be exceeded. The V•I Chip BCM’s
internal under/over voltage lockout-function prevents operation
outside of the normal input range. The BCM turns ON within an
input voltage window bounded by the "Input under-voltage
turn-on" and "Input over-voltage turn-off" levels, as specified.
The IBC may be protected against accidental application of a
reverse input voltage by the addition of a rectifier in series with
the positive input, or a reverse rectifier in shunt with the
positive input located on the load side of the input fuse.
Input impedance
Vicor recommends a minimum of 10 µF bypass capacitance be
used on-board across the +IN and –IN pins. The type of
capacitor used should have a low Q with some inherent ESR
such as an electrolytic capacitor. If ceramic capacitance is
required for space or MTBF purposes, it should be damped with
approximately 0.3
Ω
series resistance.
Anomalies in the response of the source will appear at the
output of the IBC multiplied by its K factor. The DC resistance
of the source should be kept as low as possible to minimize
voltage deviations. This is especially important if the IBC is
operated near low or high line as the over/under voltage
detection circuitry of the BCM(s) could be activated.
PC — Primary Control Pin
The Primary Control pin is a multifunction node that provides
the following functions:
Enable/Disable
Standard "P" configuration — If the PC pin is left floating, the
BCM output is enabled. Once this port is pulled lower than 2.4 Vdc
with respect to –IN, the output is disabled. This action can be
realized by employing a relay, opto-coupler or open collector
transistor. This port should not be toggled at a rate higher than 1 Hz.
Optional "M" configuration — This is the reverse function as
above: when the PC pin is left floating , the BCM output is
disabled.
THERMAL MANAGEMENT
Figures 2 to 5 provide the IBC’s maximum ambient operating
temperature vs. BCM power dissipation for a variety of airflows.
In order to determine the maximum ambient environment for a
given application, the following procedure should be used:
1. Determine the maximum load powered by the IBC.
2. Determine the power dissipated at this load by the
on-board BCM(s).
a) If using a 1 BCM configuration, this dissipation is
found in Fig. 6 on the appropriate BCM data sheet
corresponding to the output voltage of the IBC.
b) If using a 2 BCM configuration, divide the maximum
load by 2. The power dissipated by each BCM is found in
4. Using the chart corresponding to the appropriate airflow
angle, find the curve corresponding to the airflow
velocity and read the maximum ambient operating
temperature of the IBC (y-axis) based on the total BCM
power dissipation (x-axis).
For additional information on V•I Chip thermal design, please
read the "Thermal Management" section of the BCM data sheet.
Quarter-Brick Intermediate Bus Converters
Rev. 1.3
Page 5 of 8
Primary Auxiliary Supply — The PC pin can source up to
2.4 mA at 5.0 Vdc. (P version only)
Alarm — The BCM contains watchdog circuitry that monitors
output overload, input over voltage or under voltage, and
internal junction temperatures. In response to an abnormal
condition in any of the monitored parameters, the PC pin
will toggle. (P version only)
+OUT / – OUT — DC Voltage Output Pins
The 0.062" diameter + and – output pins are rated for a
maximum current of 50 A. Two sets of pins are provided for all
units with a current rating over 50 A. These pins must be
connected in parallel with minimal interconnect resistance.
Within the specified operating range, the average output voltage
is defined by the Level 1 DC behavioral model of the on board
BCM(s) as defined in the appropriate BCM data sheet.
Output impedance
The very low output impedance of the IBC, as shown in the
Product Matrix table, reduces or eliminates the need for limited
life aluminum electrolytic or tantalum capacitors at the input of
the non-isolated point-of-load converters.
Load capacitance
Total load capacitance at the output of the IBC should not
exceed the specified maximum as shown in the Product Matrix
table. Owing to the wide bandwidth and low output impedance
of the BCM, low frequency bypass capacitance and significant
energy storage may be more densely and efficiently provided by
adding capacitance at the input of the IBC.
Bi-directional operation
The BCM power train and control architecture allow bi-
directional power transfer, including reverse power processing
from the BCM output to its input. Reverse power transfer is
enabled if the BCM input is within its operating range and the
BCM is otherwise enabled. The BCM’s ability to process power
in reverse significantly improves the IBC transient response to
an output load dump.
Fig. 6 on the appropriate BCM data sheet corresponding
to the output voltage of the IBC. This number should
then be multiplied by 2 to reflect the total dissipation.
3. Determine the airflow orientation from Fig.1.
Vicor Corporation
Tel: 800-735-6200 vicorpower.com
Factorized Power
Power technology
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