Pin/Control Functions
+IN/-IN – DC Voltage Input Ports
4
3
2 1
The V•I Chip input voltage range should not be exceeded. An
internal 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
under-voltage turn-on” and “Input over-voltage turn-off” levels,
as specified. The V•I Chip 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.
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
+Out
-Out
+In
Temp.
Monitor
RSV
V
W
Y
V
W
Y
Primary Control
+Out
-Out
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
AA
AB
AC
AD
AE
AF
AG
AH
AJ
AK
AL
-In
The connection of the V•I Chip 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 10 µF in series with 0.3Ω. A single
electrolytic or equivalent low-Q capacitor may be used in place
of the series RC bypass.
Bottom View
Figure 14—BCM BGA configuration
PC – Primary Control
The Primary Control port is a multifunction node that provides
the following functions:
Signal
Name
+In
BGA
Designation
A1-L1, A2-L2
–In
TM
PC
AA1-AL1, AA2-AL2
P1, P2
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.
V1, V2
A3-G3, A4-G4,
U3-AC3, U4-AC4
J3-R3, J4-R4,
AE3-AL3, AE4-AL4
+Out
–Out
+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 26. The current source capability of the BCM is rated
in the specifications section of this document.
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 over voltage or under voltage, 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.
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.
TM – Temperature Monitor
The Temperature Monitor port monitors the highest junction
temperature of the BCM. This output may be used to provide
feedback and validation of the thermal management of
V•I Chips, as applied in diverse power systems and environments.
Total load capacitance at the output of the BCM should not
exceed the specified maximum. 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 BCM.
At 300°K (+27°C), the TM output is nominally 3.0 Vdc. The
TM output is proportional to temperature and varies at 10 mV/°C.
The TM accuracy is typically +/-5°C. A kelvin connection to
the –IN port of the BCM should be used as the ground return of
the TM signal to maintain the specified accuracy.
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
V•I Chip Bus Converter
B048K120T20
Rev. 2.2
Page 7 of 16
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VICOR [ VICOR CORPORATION ]
