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
Signal
Ground
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 8 µF in series with 0.3Ω.
Bottom View
Figure 15—BCM BGA configuration
SG – Signal Ground
The Signal Ground provides a Kelvin return for the PC and TM
ports. It is internally connected to the –IN port. The SG
connection is not sized to carry the –IN current and cannot be a
substitute for the –IN port, which must be connected with low
interconnect impedance.
Signal
Name
+In
–In
TM
SG
PC
BGA
Designation
A1-L1, A2-L2
AA1-AL1, AA2-AL2
P1, P2
T1, T2
V1, V2
A3-G3, A4-G4,
U3-AC3, U4-AC4
J3-R3, J4-R4,
AE3-AL3, AE4-AL4
PC – Primary Control
The Primary Control port is a multifunction node that provides
the following functions:
+Out
–Out
Enable/Disable – If the PC port is left floating or is at a
logic HI, the BCM output is enabled. Once this port
is pulled lower than 2.4 Vdc with respect to SG, the output
is disabled. This action can be realized by employing a
relay, opto-coupler, or open collector transistor. Refer to
Figures 1-3, 13 and 14 for the typical Enable/Disable
characteristics. This port should not be toggled at a rate
higher than 1 Hz.
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 +/-5 °C. SG should be used as ground
return of the TM signal to maintain the specified accuracy.
+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 28. 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.
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 port will toggle. Refer to Figure 14 for
PC alarm characteristics.
The low output impedance of the BCM, see Figure 9, reduces
or eliminates the need for limited life aluminum electrolytic or
tantalum capacitors at the input of POL converters.
TM – Temperature Monitor
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 (see Figure 9), low
frequency bypass capacitance and significant energy storage
may be more densely and efficiently provided by adding
capacitance at the input of the BCM.
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.
Vicor Corporation
Tel: 800-735-6200
vicorpower.com
V•I Chip Bus Converter
B048K120T20
Rev. 1.7
Page 7 of 16
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VICOR [ VICOR CORPORATION ]
