End of Life
- Replaced by BCM48Bx080y240A00
BCM
®
Bus
B048F080T24
B 048 F 080 M 24
S
Converter
C
NRTL
US
Narrow Input Range Sine Amplitude Converter™
• 48 V to 8 V VI Chip
®
Bus Converter
• 240 Watt (360 Watt for 1 ms)
• High density – 813 W/in
3
• Small footprint – 210 W/in
2
• Low weight – 0.5 oz (15 g)
• ZVS / ZCS isolated Sine
Amplitude Converter™
• Typical efficiency 95%
• 125°C operation (T
J
)
• <1 µs transient response
• 3.5 million hours MTBF
• No output filtering required
V
IN
= 38 - 55 V
V
OUT
= 6.34 - 9.16 V
I
OUT
= 30 A
K = 1/6
R
OUT
= 10.0 mΩ max
©
Product Description
The VI Chip
®
bus converter is a high efficiency (>95%),
narrow input range Sine Amplitude Converter
TM
(SAC
TM
)
operating from a 38 to 55 Vdc primary bus to deliver an
isolated 6.34 V to 9.16 V secondary. The bus converter
may be used to power non-isolated POL converters or as
an independent 6.34 – 9.16 V source. Due to the fast
response time and low noise of the bus converter, the
need for limited life aluminum electrolytic or tantalum
capacitors at the load is reduced—or eliminated—
resulting in savings of board area, materials and total
system cost.
The bus converter achieves a power density of 813 W/in
3
in a VI Chip package compatible with standard pick-and-
place and surface mount assembly process. The
VI Chip package provides flexible thermal management
through its low junction-to-board and junction-to-case
thermal resistance. Owing to its high conversion
efficiency and safe operating temperature range, the bus
converter does not require a discrete heat sink in typical
applications. Low junction-to-case and junction-to-lead
thermal impedances assure low junction temperatures
and long life in the harshest environments.
Absolute Maximum Ratings
Parameter
+In to -In
PC to -In
+Out to -Out
Isolation voltage
Output current
Peak output current
Output power
Peak output power
Case temperature during reflow
[a]
Values
-1.0 to 60
100
-0.3 to 7.0
-0.5 to 16
2,250
39
45.0
240
360
225
245
Unit
Vdc
Vdc
Vdc
Vdc
Vdc
A
A
W
W
°C
°C
°C
°C
°C
°C
Notes
For 100 ms
Input to output
Continuous
For 1 ms
Continuous
For 1 ms
MSL 5
MSL 6, TOB = 4 hrs
T-Grade
M-Grade
T-Grade
M-Grade
Operating junction temperature
Storage temperature
Notes:
[b]
-40 to 125
-55 to 125
-40 to 125
-65 to 125
[a] 245°C reflow capability applies to product with manufacturing date code 1001 and greater.
[b] The referenced junction is defined as the semiconductor having the highest temperature.
This temperature is monitored by a shutdown comparator.
Part Numbering
B
Bus Converter
048
Input Voltage
Designator
F
080
Output Voltage
Designator
(=V
OUT
x10)
T
24
Output Power
Designator
(=P
OUT
/10)
Configuration
F = J-lead
T = Through hole
Product Grade Temperatures (°C)
Grade
Storage
Operating (T
J
)
T
-40 to125
-40 to125
M
-65 to 125
-55 to 125
BCM
®
Bus Converter
Page 1 of 12
Rev 2.8
06/2014
vicorpower.com
800 927.9474
End of Life
- Replaced by BCM48Bx080y240A00
Specifications
Input
(Conditions are at 48 V
IN
, full load, and 25°C ambient unless otherwise specified)
Parameter
Input voltage range
Input dV/dt
Input undervoltage turn on
Input undervoltage turn off
Input overvoltage turn on
Input overvoltage turn off
Input quiescent current
Inrush current overshoot
Input current
Input reflected ripple current
No load power dissipation
Internal input capacitance
Internal input inductance
Recommended external input capacitance
B048F080T24
Min
38
Typ
48
Max
55
1
37.4
Unit
Vdc
V/µs
Vdc
Vdc
Vdc
Vdc
mA
A
Adc
mA p-p
W
µF
nH
µF
Note
32.0
55.0
60.0
2.5
5.9
5.5
120
5.2
3.6
5
47
7.0
PC low
Using test circuit in Figure 20; See Figure 1
Using test circuit in Figure 20; See Figure 4
200 nH maximum source inductance; See Figure 20
Input Waveforms
Figure 1
— Inrush transient current at full load and 48 V
IN
with PC enabled
Figure 2
— Output voltage turn on waveform with PC enabled
at full load and 48 V
IN
Figure 3
— Output voltage turn on waveform with input turn on
at full load and 48 V
IN
Figure 4
— Input reflected ripple current at full load and 48 V
IN
BCM
®
Bus Converter
Page 2 of 12
Rev 2.8
06/2014
vicorpower.com
800 927.9474
End of Life
- Replaced by BCM48Bx080y240A00
Specifications
(continued)
B048F080T24
Output
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Output voltage
Output power
Rated DC current
Peak repetitive power
Current share accuracy
Efficiency
Half load
Full load
Internal output inductance
Internal output capacitance
Load capacitance
Output overvoltage set point
Output ripple voltage
No external bypass
30 µF bypass capacitor
Short circuit protection set point
Average short circuit current
Effective switching frequency
Line regulation
K
Load regulation
R
OUT
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
94.0
94.0
94.3
94.7
1.6
48
2,300
9.2
132
17
42
3.10
0.1650
0.3
3.20
1/6
7.5
200
200
1
0
0
270
78
3.30
0.1683
10.0
m
Ω
mV
ns
µs
mV
mV
ms
ms
100% load step; See Figures 10 and 11
See Figures 10 and 11
See Figures 10 and 11
No output filter; See Figure 3
No output filter; See Figure 2
No output filter; See Figure 3
No output filter
220
Min
6.34
6.04
0
0
0
Typ
Max
9.16
8.89
240
232
39
360
10
Unit
Vdc
Vdc
W
W
Adc
W
%
%
%
nH
µF
µF
Vdc
mVp-p
mVp-p
Adc
A
MHz
Note
No load
Full load
39 - 55 V
IN
38 - 55 V
IN
P
OUT
≤
240 W
Max pulse width 1ms, max duty cycle 10%,
baseline power 50%
See Parallel Operation on Page 10
See Figure 5
See Figure 5
Effective value
Module will shut down
See Figures 7 and 9
See Figure 8
Module will shut down
Fixed, 1.6 MHz per phase
V
OUT
= K
•
V
IN
at no load
Output Waveforms
Efficiency vs. Output Power
98
14
Power Dissipation
Power Dissipation (W)
96
12
10
Efficiency (%)
94
92
90
88
86
84
82
0
30
60
90
120
150
180
210
240
8
6
4
2
0
30
60
90
120
150
180
210
240
Output Power (W)
Figure 5
— Efficiency vs. output power
Output Power (W)
Figure 6
— Power dissipation as a function of output power
BCM
®
Bus Converter
Page 3 of 12
Rev 2.8
06/2014
vicorpower.com
800 927.9474
End of Life
- Replaced by BCM48Bx080y240A00
Specifications
(continued)
B048F080T24
Output Waveforms
Figure 7
— Output voltage ripple at full load and 48 V
IN
without any external bypass capacitor.
Figure 8
— Output voltage ripple at full load and 48 V
IN
with 30 µF ceramic external bypass capacitor and 20 nH
of distribution inductance.
Ripple vs. Output Power
150
Output Ripple (mVpk-pk)
130
110
90
70
50
30
10
0
30
60
90
120
150
180
210
240
Output Power (W)
Figure 9
— Output voltage ripple vs. output power at 48 V
IN
without any external bypass capacitor.
Figure 10
— 0 – 30 A load step with 100 µF input capacitor
and no output capacitor.
Figure 11
— 30 – 0 A load step with 100 µF input capacitor
and no output capacitor.
BCM
®
Bus Converter
Page 4 of 12
Rev 2.8
06/2014
vicorpower.com
800 927.9474
End of Life
- Replaced by BCM48Bx080y240A00
Specifications
General
Parameter
MTBF
MIL-HDBK-217F
Isolation specifications
Voltage
Capacitance
Resistance
Agency approvals
Mechanical
Weight
Dimensions
Length
Width
Height
Thermal
Overtemperature shutdown
Thermal capacity
Junction-to-case thermal impedance (R
θJC
)
Junction-to-board thermal impedance (R
θJB
)
B048F080T24
(continued)
Min
Typ
3.5
Max
Unit
Mhrs
Vdc
pF
MΩ
Note
25°C, GB
Input to output
Input to output
Input to output
UL /CSA 60950-1, EN 60950-1
See mechanical drawings, Figures 15 – 18
2,250
3,000
10
cTÜVus
CE Marked for Low Voltage Directive and RoHS Recast Directive, as applicable
0.53/15
1.28/ 32,5
0.87 / 22
0.265 / 6,73
125
130
9.3
1.1
2.1
135
oz /g
in / mm
in / mm
in / mm
°C
Ws /°C
°C / W
°C / W
Junction temperature
See Thermal Considerations on Page 10
Auxiliary Pins
(Conditions are at 48 Vin, full load, and 25°C ambient unless otherwise specified)
Parameter
Primary control (PC)
DC voltage
Module disable voltage
Module enable voltage
Current limit
Enable delay time
Disable delay time
2.4
4.8
2.4
5.0
2.5
2.5
2.5
78
30
2.6
2.9
5.2
Vdc
Vdc
Vdc
mA
ms
µs
See Figure 12, time from PC low to output low
Source only
Min
Typ
Max
Unit
Note
Figure 12
— V
OUT
at full load vs. PC disable
Figure 13
— PC signal during fault
BCM
®
Bus Converter
Page 5 of 12
Rev 2.8
06/2014
vicorpower.com
800 927.9474
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