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.
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.
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.
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.
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.
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.
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.
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.
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:
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.
1. Determine the maximum load powered by the IBC.
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).
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
For additional information on V•I Chip thermal design, please
load by 2. The power dissipated by each BCM is found in read the "Thermal Management" section of the BCM data sheet.
Vicor Corporation Tel: 800-735-6200 vicorpower.com
Quarter-Brick Intermediate Bus Converters
Rev. 1.3
Page 5 of 8
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