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Not Recommended for New Designs - Replaced by BCM48Bx240y300A00
Pin / Control Functions
+In / -In – DC Voltage Input Ports
The VI Chip module input voltage range should not be exceeded. An
B048F240T30
internal undervoltage /overvoltage lockout function prevents operation
outside of the normal operating input range. The BCM ? bus converter
A
4
3
2
1
A
turns on within an input voltage window bounded by the “Input
undervoltage turn on” and “Input overvoltage turn off” levels, as
specified. The module 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 module 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 47 μF in
+Out
-Out
+Out
-Out
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
B
C
D
E
H
J
K
L
M
N
P
R
T
+In
TM
RSV
PC
-In
series with 0.3 Ω . A single electrolytic or equivalent low-Q capacitor may
be used in place of the series RC bypass.
Bottom View
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 module
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.
Signal
Name
+In
–In
TM
RSV
PC
+Out
–Out
Designation
A1-E1, A2-E2
L1-T1, L2-T2
H1, H2
J1, J2
K1, K2
A3-D3, A4-D4,
J3-M3, J4-M4
E3-H3, E4-H4,
N3-T3, N4-T4
Alarm – The module 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.
TM and RSV – Reserved for factory use.
+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 21. The current source capability
of the module is rated in the specifications section of this document.
The low output impedance of the module 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 modules should not exceed
the specified maximum. Owing to the wide bandwidth and low output
impedance of the module, low frequency bypass capacitance and
significant energy storage may be more densely and efficiently provided
by adding capacitance at the input of the BCM module.
Figure 14 — BCM ? bus converter pin configuration
BCM ? Bus Converter
Page 6 of 12
Rev 2.8
01/2014
vicorpower.com
800 927.9474
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