PIN / CONTROL FUNCTIONS
+In / -In – DC Voltage Input Ports
The VI BRICK (BCM) input voltage range should not be exceeded. An inter-
nal under / over voltage lockout function prevents operation outside of the
normal operating input range. The BCM turns on within an input voltage
window bounded by the “Input undervoltage turn-on” and “Input
overvoltage turn-off” levels, as specified. The BCM 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.
The connection of the BCM to its power source should be implemented
with minimal distribution inductance. If the interconnect inductance
exceeds 100 nH, the input should be bypassed with a RC damper to retain
low source impedance and stable operation. With an interconnect
inductance of 200 nH, the RC damper may be 2 µF in series with 0.3
Ω.
A
single electrolytic or equivalent low-Q capacitor may be used in place of
the series RC bypass.
+Out / -Out – DC Voltage Output Ports
Two sets of contacts are provided for the +Out port. They must be
connected in parallel with low interconnect resistance. Similarly, two sets
of contacts are provided for the –Out port. They must be connected in
parallel with low interconnect resistance. Within the specified operating
range, the average output voltage is defined by the Level 1 DC
behavioral model of Figure 16. The current source capability of the BCM is
rated in the specifications section of this document.
The low output impedance of the BCM reduces or eliminates the need for
limited life aluminum electrolytic or tantalum capacitors at the input of POL
converters.
Total load capacitance at the output of the BCM should not exceed the
specified maximum. Owing to the wide bandwidth and low output imped-
ance 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 BCM.
PC – Primary Control
The Primary Control port is a multifunction node that provides the
following functions:
Enable / Disable – If the PC port 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. Refer
to Figures 1-3, 12 and 13 for the typical enable / disable
characteristics. This port should not be toggled at a rate higher
than 1 Hz. The PC port should also not be driven by or pulled up to
an external voltage source.
Primary Auxiliary Supply – The PC port can source up to 2.4 mA at
5.0 Vdc. The PC port should never be used to sink current.
Alarm – The BCM contains circuitry that monitors output overload,
input overvoltage or undervoltage, and internal junction temperatures. In
response to an abnormal condition in any of the monitored parameters,
the PC port will toggle. Refer to Figure 13 for PC alarm characteristics.
Figure 14
— VI BRICK BCM pin configuration (viewed from pin side)
TM and RSV – Reserved for factory use.
Bus Converter Module
BC352A110T030FP
vicorpower.com
Rev. 1.0
Page 7 of 11
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