B048F240T30
B 048 F 240 M 30
BCM
TM
Bus Converter
• 48 V to 24 V V•I Chip™ Bus Converter
• 300 Watt (450 Watt for 1 ms)
• High density – 1017 W/in
3
• Small footprint – 260 W/in
2
• Low weight – 0.5 oz (15 g)
• ZVS / ZCS isolated Sine
Amplitude Converter™
• Typical efficiency 96%
• 125°C operation (T
J
)
• <1 µs transient response
©
V
IN
= 38 - 53 V
V
OUT
= 19.0 - 26.5 V
I
OUT
= 12.5 A
• 3.5 million hours MTBF
• No output filtering required
K = 1/2
R
OUT
= 60.0 mΩ max
Product Description
The V
•
I Chip™ bus converter is a high efficiency (>96%),
narrow input range Sine Amplitude Converter
TM
(SAC
TM
)
operating from a 38 to 53 Vdc primary bus to deliver an
isolated 19.0 V to 26.5 V secondary. The bus converter
may be used to power non-isolated POL converters or as
an independent 19.0 – 26.5 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 1017 W
/in
3
in a V
•
I Chip package compatible with standard
pick-and-place and surface mount assembly process. The
V
•
I 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 50
2,250
14.8
18.8
300
450
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
240
Output Voltage
Designator
(=V
OUT
x10)
T
30
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
vicorpower.com
800-735-6200
BCM™ Bus Converter
B048F240T30
Rev. 2.8
Page 1 of 12
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
Min
38
Typ
48
Max
53
1
37.4
Unit
Vdc
V/µs
Vdc
Vdc
Vdc
Vdc
mA
A
Adc
mA p-p
W
µF
nH
µF
Note
32.8
53.0
59.0
2.6
3.5
6.8
120
4.0
1.9
5
47
5.9
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
vicorpower.com
800-735-6200
BCM™ Bus Converter
B048F240T30
Rev. 2.8
Page 2 of 12
Specifications
(continued)
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
3.3 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
95.0
94.7
95.7
95.8
1.1
7.7
300
26.5
150
13
15.1
3.0
0.4950
0.62
3.4
1/2
43.6
600
200
1
0
0
260
65
3.8
0.5050
60.0
mΩ
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
348
Min
19.0
18.3
0
0
0
Typ
Max
26.5
25.8
300
269
14.8
450
10
Unit
Vdc
Vdc
W
W
Adc
W
%
%
%
nH
µF
µF
Vdc
mVp-p
mVp-p
Adc
A
MHz
Note
No load
Full load
42 - 53 V
IN
38 - 53 V
IN
P
OUT
≤
300 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, 1.7 MHz per phase
V
OUT
= K
•
V
IN
at no load
Output Waveforms
Efficiency vs. Output Power
98
Power Dissipation
14
Power Dissipation (W)
12
10
8
6
4
2
96
Efficiency (%)
94
92
90
88
0
30
60
90
120
150
180
210
240
270
300
0
30
60
90
120
150
180
210
240
270
300
Output Power (W)
Output Power (W)
Figure 6
— Power dissipation as a function of output power
Figure 5
— Efficiency vs. output power
vicorpower.com
800-735-6200
BCM™ Bus Converter
B048F240T30
Rev. 2.8
Page 3 of 12
Specifications
(continued)
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 3.3 µF ceramic external bypass capacitor and 20 nH
of distribution inductance.
Ripple vs. Output Power
175
Output Ripple (mVpk-pk)
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 V
IN
without any external bypass capacitor.
Figure 10
— 0 – 12.5 A load step with 100 µF input capacitor
and no output capacitor.
Figure 11
— 12.5 – 0 A load step with 100 µF input capacitor
and no output capacitor.
vicorpower.com
800-735-6200
BCM™ Bus Converter
B048F240T30
Rev. 2.8
Page 4 of 12
Specifications
General
Parameter
MTBF
MIL-HDBK-217F
Isolation specifications
Voltage
Capacitance
Resistance
Agency approvals
(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
Low voltage directive
See mechanical drawings, Figures 15 – 18
2,250
3,000
10
cTÜVus
CE Mark
RoHS
0.53/15
1.28/ 32,5
0.87 / 22
0.265 / 6,73
125
130
9.3
1.1
2.1
135
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
)
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
65
20
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
vicorpower.com
800-735-6200
BCM™ Bus Converter
B048F240T30
Rev. 2.8
Page 5 of 12
