VICOR BC048A480T030TP

BCM TM Bus Converter
Features
Size:
1.91 x 1.09 x 0.37 in
48,6 x 27,7 x 9,5 mm
• 100°C baseplate operation
• Typical efficiency 96%
• 48 V to 48 V Bus Converter
• <1 µs transient response
• 300 Watt (450 Watt for 1 ms)
• >3.5 million hours MTBF
• High density – up to 390 W/in3
• Isolated output
• Small footprint – 1.64 and 2.08 in2
• No output filtering required
• Height above board – 0.37 in (9.5 mm)
• Lead free wave solder compatible
• Low weight – 1.10 oz (31.3 g)
• Agency approvals
• ZVS / ZCS isolated sine amplitude converter
Applications
• Isolated intermediate bus for
non-isolated POL
Product Overview
• Telecommunication systems
VI BRICK BCM modules use advanced Sine Amplitude ConverterTM (SACTM) technology,
• Networking
thermally enhanced packaging technologies, and advanced CIM processes to provide high
• Servers
power density and efficiency, superior transient response, and improved thermal
• ATE
management. These modules can be used to provide an isolated intermediate bus to power
non-isolated POL converters and due to the fast response time and low noise of the BCM,
capacitance can be reduced or eliminated near the load.
Part Numbering
BC
048
A
480
Bus
Converter
Module
Input
Voltage
Designator
Package
Size
Output
Voltage
Designator
(=VOUT x10)
T
030
T=
M=
Bus Converter Module
BC048A480T030FP
P
Baseplate
Pin Style
Output
Power
Designator
(=POUT /10)
Product Grade Temperatures (°C)
Grade
F
Operating
Storage
–40 to +100 –40 to +125
–55 to +100 –65 to +125
vicorpower.com
F = Slotted flange
T = Transverse heat sink[a]
[a] contact
P = Through hole
factory
Rev. 1.0
Page 1 of 11
SPECIFICATIONS
Electrical characteristics apply over the full operating range of input voltage, output load (resistive) and baseplate temperature,
unless otherwise specified. All temperatures refer to the operating temperature at the center of the baseplate.
Absolute Maximum Ratings
Parameter
Values
Unit
Notes
+In to -In
-1.0 to 60
Vdc
+In to -In
100
Vdc
PC to -In
-0.3 to 7.0
Vdc
+Out to -Out
-0.5 to 60.0
Vdc
Isolation voltage
2,250
Vdc
Output current
8.2
A
Continuous
For 100 ms
Input to output
Peak output current
9.4
A
For 1 ms
Output power
300
W
Continuous
W
For 1 ms
°C
°C
T-Grade; baseplate
M-Grade; baseplate
T-Grade
M-Grade
Peak output power
450
-40 to +100
-55 to +100
-40 to +125
-65 to +125
Operating temperature
Storage temperature
°C
°C
Note: Stresses in excess of the maximum ratings can cause permanent damage to the device. Operation of the device is not implied at these or any other conditions
in excess of those given in the specification. Exposure to absolute maximum ratings can adversely affect device reliability.
Input Specifications
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Min
Typ
Max
Input voltage range
38.0
48
55
Vdc
1
V/µs
Input dV/dt
Input undervoltage turn-on
38.0
Input undervoltage turn-off
32.0
Input overvoltage turn-on
55.0
Unit
Vdc
Vdc
Vdc
Input overvoltage turn-off
59.5
Vdc
Input quiescent current
2.6
mA
Inrush current overshoot
8.2
A
Input current
6.7
143
No load power dissipation
2.8
Internal input capacitance
4.0
µF
Internal input inductance
5
nH
Recommended external input capacitance
47
µF
BC048A480T030FP
mA p-p
4.6
PC low
Using test circuit in Figure 15; See Figure 1
Adc
Input reflected ripple current
Bus Converter Module
Notes
Using test circuit in Figure 15; See Figure 4
W
vicorpower.com
200 nH maximum source inductance; See Figure 15
Rev. 1.0
Page 2 of 11
SPECIFICATIONS (CONT.)
INPUT WAVEFORMS
Figure 1 — Inrush transient current at full load and 48 Vin with PC
enabled
Figure 2 — Output voltage turn-on waveform with PC enabled at full
load and 48 Vin
Figure 3 — Output voltage turn-on waveform with input turn-on at
full load and 48 Vin
Figure 4 — Input reflected ripple current at full load and 48 Vin
Bus Converter Module
BC048A480T030FP
vicorpower.com
Rev. 1.0
Page 3 of 11
SPECIFICATIONS (CONT.)
Output Specifications
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Min
38.0
36.7
0
0
Output voltage
Output power
Rated DC current
Typ
Max
55.0
53.8
297
8.2
Unit
Vdc
Vdc
W
Adc
450
W
10
%
Peak repetitive power
Current share accuracy
Efficiency
Half load
Full load
Internal output inductance
Internal output capacitance
Load capacitance
Output overvoltage setpoint
Output ripple voltage
No external bypass
9.4 µF bypass capacitor
Short circuit protection set point
Average short circuit current
Effective switching frequency
Line regulation
K
Load regulation
ROUT
Transient response
Voltage overshoot
Response time
Recovery time
Output overshoot
Input turn-on
PC enable
Output turn-on delay
From application of power
From release of PC pin
5
96.0
96.0
96.7
96.4
1.6
6
100
55.0
180
20
320
6.4
3.2
0.095
3.3
3.5
0.9900
1
1.0100
188.0
210.0
Note
No load
Full load
38.0 - 55 VIN
POUT ≤ 300 W
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
See Parallel Operation on Page 8
%
%
nH
µF
µF
Vdc
See Figure 5
See Figure 5
Effective value
mVp-p
mVp-p
Adc
A
MHz
See Figures 7 and 9
See Figure 8
Module will shut down
Fixed, 1.7 MHz per phase
VOUT = K•VIN at no load
mΩ
1.2
200
1
V
ns
µs
100% load step; See Figures 10 and 11
See Figures 10 and 11
See Figures 10 and 11
0
0
mV
mV
No output filter; See Figure 3
No output filter; See Figure 2
295
67
ms
ms
No output filter; See Figure 3
No output filter
OUTPUT WAVEFORMS
Power Dissipation
Efficiency vs. Output Power
12
Power Dissipation (W)
98
Efficiency (%)
96
94
92
90
88
86
10
8
6
4
2
0
30
60
90
120
150
180
210
240
270
300
0
Output Power (W)
Figure 5 — Efficiency vs. output power
Bus Converter Module
BC048A480T030FP
30
60
90
120
150
180
210
240
270
300
Output Power (W)
Figure 6 — Power dissipation as a function of output power
vicorpower.com
Rev. 1.0
Page 4 of 11
SPECIFICATIONS (CONT.)
OUTPUT WAVEFORMS
Figure 8 — Output voltage ripple at full load and 48 Vin with 9.4 µF
ceramic external bypass capacitor and 20 nH of distribution inductance.
Figure 7 — Output voltage ripple at full load and 48 Vin without any
external bypass capacitor.
Ripple vs. Output Power
Output Ripple (mVpk-pk)
200
175
150
125
100
75
50
25
0
30
60
90
120
150
180
210
240
270
300
Output Power (W)
Figure 9 — Output voltage ripple vs. output power at 48 Vin without any
external bypass capacitor.
Figure 10 — 0 -6.3 A load step with 100 µF input capacitor and no
output capacitor.
Figure 11 — 6.3- 0 A load step with 100 µF input capacitor and no
output capacitor.
Bus Converter Module
BC048A480T030FP
vicorpower.com
Rev. 1.0
Page 5 of 11
SPECIFICATIONS (CONT.)
General Specifications
Parameter
Min
Typ
Max
Unit
Notes
Mhrs
25°C, GB
MTBF
MIL-HDBK-217F
3.5
Isolation specifications
Voltage
2,250
Capacitance
3,000
Resistance
10
Agency approvals
Vdc
Input to output
pF
Input to output
MΩ
Input to output
cTÜVus
UL /CSA 60950-1, EN 60950-1
CE Mark
Low voltage directive
RoHS
Mechanical
See Mechanical Drawings, Figure 18, 19
Weight
1.10/31,3
oz /g
Length
1.91/ 48,6
in / mm
Width
1.09/ 27,7
in / mm
Baseplate model
Height
0.37/ 9,5
in / mm
Baseplate model
Dimensions
Baseplate model
Thermal
Over temperature shutdown
125
130
135
°C
Thermal capacity
23.8
Ws /°C
Baseplate to ambient
7.7
°C / W
Baseplate to ambient; 1000 LFM
2.9
°C / W
Baseplate to sink; flat greased surface
0.40
°C / W
Baseplate to sink; thermal pad
0.36
°C / W
Junction temperature
Auxiliary Pins
Parameter
Min
Typ
Max
5.2
Unit
Notes
Primary control (PC)
DC voltage
4.8
5.0
Module disable voltage
2.4
2.5
Module enable voltage
Current limit
2.4
Vdc
Vdc
2.5
2.6
Vdc
2.5
2.9
mA
Enable delay time
67
ms
Disable delay time
40
µs
Figure 12 — VOUT at full load vs. PC disable
Bus Converter Module
BC048A480T030FP
Source only
See Figure 12, time from PC low to output low
Figure 13 — PC signal during fault
vicorpower.com
Rev. 1.0
Page 6 of 11
PIN / CONTROL FUNCTIONS
+In / -In – DC Voltage Input Ports
+Out / -Out – DC Voltage Output Ports
The VI BRICK (BCM) 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 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.
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 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 47 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.
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
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.
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.
TM and RSV – Reserved for factory use.
Bus Converter Module
BC048A480T030FP
Figure 14 — VI BRICK BCM pin configuration (viewed from pin side)
vicorpower.com
Rev. 1.0
Page 7 of 11
APPLICATION NOTES AND TEST CIRCUIT
Parallel Operation
The BCM will inherently current share when operated in an array. Arrays
may be used for higher power or redundancy in an application.
Current sharing accuracy is maximized when the source and load impedance
presented to each BCM within an array are equal. The recommended
method to achieve matched impedances is to dedicate common copper
planes within the PCB to deliver and return the current to the array, rather
than rely upon traces of varying lengths. In typical applications the current
being delivered to the load is larger than that sourced from the input,
allowing traces to be utilized on the input side if necessary. The use of
dedicated power planes is, however, preferable.
The BCM power train and control architecture allow bi-directional power
transfer, including reverse power processing from the BCM output to its
input. Reverse power transfer is enabled if the BCM input is within its
operating range and the BCM is otherwise enabled. The BCM’s ability to
process power in reverse improves the BCM transient response to an output
load dump.
Anomalies in the response of the source will appear at the output of the
BCM multiplied by its K factor. The DC resistance of the source should be
kept as low as possible to minimize voltage deviations. This is especially
important if the BCM is operated near low or high line as the over/under
voltage detection circuitry could be activated.
Input Fuse Recommendations
VI BRICKs are not internally fused in order to provide flexibility in
configuring power systems. However, input line fusing of VI BRICKs must
always be incorporated within the power system. A fast acting fuse should
be placed in series with the +In port. For agency approvals and fusing
conditions, click on the link below:
http://www.vicorpower.com/technical_library/technical_documentation/quality_and
_certification/safety_approvals/
Application Notes
Input Impedance Recommendations
To take full advantage of the BCM capabilities, the impedance presented
to its input terminals must be low from DC to approximately 5 MHz. The
source should exhibit low inductance (less than 100 nH) and should have a
critically damped response. If the interconnect inductance exceeds 100 nH,
the BCM input pins should be bypassed with an RC damper (e.g., 47 µF in
series with 0.3 Ω) to retain low source impedance and stable operations.
Given the wide bandwidth of the BCM, the source response is generally
the limiting factor in the overall system response.
For BCM and VI BRICK application notes on soldering, board layout, and
system design please click on the link below:
http://www.vicorpower.com/technical_library/application_information/
Applications Assistance
Please contact Vicor Applications Engineering for assistance,
1-800-927-9474, or email at [email protected]
Input reflected ripple
measurement point
10 A [a]
Fuse
F1
+
+IN
+
+OUT
Enable/Disable Switch
-OUT
C1
47 µF
R2
2 kΩ
electrolytic
SW1
TM
RSV
PC
BCM
D1
-IN
R3
5 mΩ
Load
+OUT
C3
9.4 µF
-OUT
–
–
Notes:
1. Source inductance should be no more than 200 nH. If source inductance is greater than 200 nH, additional bypass capacitance may be required.
2. C3 should be placed close to the load.
3. R3 may be ESR of C3 or a separate damping resistor.
4. D1 power good indicator will dim when a module fault is detected.
[a]
See Input Fuse Recommendations section
Figure 15 — VI BRICK BCM test circuit
Bus Converter Module
BC048A480T030FP
vicorpower.com
Rev. 1.0
Page 8 of 11
BEHAVIORAL MODELS
VI BRICK Bus Converter Level 1 DC Behavioral Model for 48 V to 48 V, 300 W
ROUT
IOUT
+
+
188.0 mΩ
1 • Iout
VIN
+
+
–
IQ
58 mA
1 • Vin
V•I
VOUT
–
K
–
–
©
Figure 16 — This model characterizes the DC operation of the VI BRICK bus converter, including the converter transfer function and its losses. The model
enables estimates or simulations of output voltage as a function of input voltage and output load, as well as total converter power dissipation or heat generation.
VI BRICK Bus Converter Level 2 Transient Behavioral Model for 48 V to 48 V, 300 W
14.8 nH
ROUT
IOUT
L IN = 5 nH
+
188.0 mΩ
RCIN
1.3 mΩ
CIN
VIN
Lout = 1.61 nH
V•I
1 • Iout
4.0 µF
IQ
58 mA
+
+
–
RCOUT
47.1 mΩ
+
0.87 mΩ
1 • Vin
COUT
6 µF
VOUT
–
K
–
–
©
Figure 17 — This model characterizes the AC operation of the VI BRICK bus converter including response to output load or input voltage transients or
steady state modulations. The model enables estimates or simulations of input and output voltages under transient conditions, including response to a
stepped load with or without external filtering elements.
Bus Converter Module
BC048A480T030FP
vicorpower.com
Rev. 1.0
Page 9 of 11
MECHANICAL DRAWINGS
Baseplate - Slotted Flange
Heat Sink (Transverse)
Figure 18 — Module outline
Recommended PCB Pattern
(Component side shown)
Figure 19 — PCB mounting specifications
Bus Converter Module
BC048A480T030FP
vicorpower.com
Rev. 1.0
Page 10 of 11
Warranty
Vicor products are guaranteed for two years from date of shipment against defects in material or workmanship when in
normal use and service. This warranty does not extend to products subjected to misuse, accident, or improper application
or maintenance. Vicor shall not be liable for collateral or consequential damage. This warranty is extended to the original
purchaser only.
EXCEPT FOR THE FOREGOING EXPRESS WARRANTY, VICOR MAKES NO WARRANTY, EXPRESS OR IMPLIED, INCLUDING,
BUT NOT LIMITED TO, THE WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
Vicor will repair or replace defective products in accordance with its own best judgement. For service under this warranty,
the buyer must contact Vicor to obtain a Return Material Authorization (RMA) number and shipping instructions. Products
returned without prior authorization will be returned to the buyer. The buyer will pay all charges incurred in returning
the product to the factory. Vicor will pay all reshipment charges if the product was defective within the terms of this
warranty.
Information published by Vicor has been carefully checked and is believed to be accurate; however, no responsibility is
assumed for inaccuracies. Vicor reserves the right to make changes to any products without further notice to improve
reliability, function, or design. Vicor does not assume any liability arising out of the application or use of any product or
circuit; neither does it convey any license under its patent rights nor the rights of others. Vicor general policy does not
recommend the use of its components in life support applications wherein a failure or malfunction may directly threaten
life or injury. Per Vicor Terms and Conditions of Sale, the user of Vicor components in life support applications assumes
all risks of such use and indemnifies Vicor against all damages.
Vicor’s comprehensive line of power solutions includes high density AC-DC and
DC-DC modules and accessory components, fully configurable AC-DC and DC-DC
power supplies, and complete custom power systems.
Information furnished by Vicor is believed to be accurate and reliable. However, no responsibility is assumed by Vicor for
its use. Vicor components are not designed to be used in applications, such as life support systems, wherein a failure or
malfunction could result in injury or death. All sales are subject to Vicor’s Terms and Conditions of Sale, which are available
upon request.
Specifications are subject to change without notice.
Intellectual Property Notice
Vicor and its subsidiaries own Intellectual Property (including issued U.S. and Foreign Patents and pending patent
applications) relating to the products described in this data sheet. Interested parties should contact Vicor's Intellectual Property Department.
The products described on this data sheet are protected by the following U.S. Patents Numbers:
5,945,130; 6,403,009; 6,710,257; 6,911,848; 6,930,893; 6,934,166; 6,940,013; 6,969,909; 7,038,917;
7,166,898; 7,187,263; 7,361,844; D496,906; D505,114; D506,438; D509,472; and for use under 6,975,098
and 6,984,965
Vicor Corporation
25 Frontage Road
Andover, MA, USA 01810
Tel: 800-735-6200
Fax: 978-475-6715
email
Customer Service: [email protected]
Technical Support: [email protected]
Bus Converter Module
BC048A480T030FP
vicorpower.com
Rev. 1.0
3/08