B048F096T24-EB Datasheet, PDF (6/12 Pages) Vicor Corporation – Bus Converter

Pin / Control Functions
+In / -In – DC Voltage Input Ports
The V•I Chip™ module input voltage range should not be exceeded.
An internal undervoltage /overvoltage lockout function prevents
operation outside of the normal operating input range. The BCM™ bus
converter 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
series with 0.3Ω. A single electrolytic or equivalent low-Q capacitor may
be used in place of the series RC bypass.
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.
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.
+Out
-Out
+Out
-Out
43
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
21
A
B
C
+In
D
E
TM
H
J
RSV
K
PC
L
M
N
P
-In
R
T
Bottom View
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
Figure 14 — BCM™ bus converter pin configuration
vicorpower.com 800-735-6200
BCM™ Bus Converter
B048F096T24
Rev. 4.9
Page 6 of 12