BCM
®
Bus Converter
BCM48Bx120y300A00
®
S
C
US
C
NRTL
US
Isolated Fixed Ratio DC-DC Converter
Features & Benefits
•
48V
DC
– 12V
DC
300W Bus Converter
•
High efficiency (>96%) reduces system
power consumption
•
High power density (>1022W/in
3
)
reduces power system footprint by >40%
•
Contains built-in protection features:
n
Undervoltage
n
Overvoltage Lockout
n
Overcurrent Protection
n
Short circuit Protection
n
Overtemperature Protection
•
Provides enable/disable control,
internal temperature monitoring
•
Can be paralleled to create multi-kW arrays
V
IN
= 48V (38 – 55V)
V
OUT
= 12V (9.5 – 13.8V)
(
no load
)
Product Ratings
P
OUT
= up to 300W
K = 1/4
Description
The VI Chip
®
bus converter is a high efficiency (>96%) Sine
Amplitude Converter™ (SAC™) operating from a 38 to 55V
DC
primary bus to deliver an isolated, ratiometric output voltage from
9.5 to 13.8V
DC
. The Sine Amplitude Converter offers a low AC
impedance beyond the bandwidth of most downstream regulators;
therefore capacitance normally at the load can be located at the
input to the Sine Amplitude Converter. Since the transformation
ratio of the BCM48Bx120y300A00 is 1/4, the capacitance value can
be reduced by a factor of 16x, resulting in savings of board area,
materials and total system cost.
The BCM48BF120y300A00 is provided in a VI Chip package
compatible with standard pick-and-place and surface mount
assembly processes. The co-molded VI Chip package provides
enhanced thermal management due to a large thermal interface
area and superior thermal conductivity. The high conversion
efficiency of the BCM48Bx120y300A00 increases overall
system efficiency and lowers operating costs compared to
conventional approaches.
Typical Applications
•
High End Computing Systems
•
Automated Test Equipment
•
High Density Power Supplies
•
Communications Systems
Part Numbering
Product Number
BCM48Bx120y300A00
Package Style (x)
F
= J-Lead
T
= Through hole
Product Grade (y)
T
= -40° to 125°C
M
= -55° to 125°C
Typical Application
For Storage and Operating Temperatures see General Characteristics
enable / disable
switch
SW1
F1
V
IN
PC
TM
BCM
Bus Converter
®
+IN
+OUT
L
O
A
D
-IN
-OUT
BCM
®
Bus Converter
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08/2016
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BCM48Bx120y300A00
Pin Configuration
4
A
3
2
1
A
B
C
D
E
+OUT
B
C
D
E
+IN
-OUT
F
G
H
J
H
J
K
L
M
N
P
R
T
TM
RSV
PC
+OUT
K
L
M
N
-OUT
P
R
T
-IN
Bottom View
Pin Descriptions
Pin Number
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
Signal Name
+IN
–IN
TM
RSV
PC
+OUT
–OUT
Type
INPUT POWER
INPUT POWER
RETURN
OUTPUT
NC
OUTPUT/INPUT
OUTPUT POWER
OUTPUT POWER
RETURN
Positive input power terminal
Negative input power terminal
Temperature monitor, input side referenced signal
No connect
Enable and disable control, input side referenced signal
Positive output power terminal
Negative output power terminal
Function
BCM
®
Bus Converter
Page 2 of 20
Rev 1.8
08/2016
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800 927.9474
BCM48Bx120y300A00
Absolute Maximum Ratings
The absolute maximum ratings below are stress ratings only. Operation at or beyond these maximum ratings can cause permanent damage to the device.
Parameter
+IN to –IN
V
IN
slew rate
Isolation voltage, input to ouput
+OUT to –OUT
Output current transient
Output current average
PC to –IN
TM to –IN
≤
10ms,
≤
10% DC
-1
-3
-2
-0.3
-0.3
Operational
Comments
Min
-1
-1
Max
60
1
2250
16
37.5
30
20
7
Unit
V
V/µs
V
V
A
A
V
V
BCM
®
Bus Converter
Page 3 of 20
Rev 1.8
08/2016
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800 927.9474
BCM48Bx120y300A00
Electrical Specifications
Specifications apply over all line and load conditions, unless otherwise noted;
boldface
specifications apply over the temperature range of
-40°C
≤
T
CASE
≤
100°C (T-Grade); all other specifications are at T
CASE
= 25ºC unless otherwise noted.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Powertrain
Input voltage range, continuous
Input voltage range, transient
Quiescent current
V
IN
to V
OUT
time
V
IN_DC
V
IN_TRANS
I
Q
T
ON1
Full current or power supported, 50ms max,
10% duty cycle max
Disabled, PC Low
V
IN
= 48V, PC floating
V
IN
= 48V, T
CASE
= 25ºC
No load power dissipation
P
NL
V
IN
= 48V
V
IN
= 38V to 55V, T
CASE
= 25ºC
V
IN
= 38V to 55V
Inrush current peak
DC input current
Transformation ratio
Output power (average)
Output power (peak)
Output current (average)
Output current (peak)
I
INR_P
I
IN_DC
K
P
OUT_AVG
P
OUT_PK
I
OUT_AVG
I
OUT_PK
10ms max, I
OUT_AVG
≤
30A
V
IN
= 48V, I
OUT
= 25A; T
CASE
= 25°C
Efficiency (ambient)
h
AMB
V
IN
= 38V to 55V, I
OUT
= 25A; T
CASE
= 25°C
V
IN
= 48V, I
OUT
= 12.5A; T
CASE
= 25°C
Efficiency (hot)
Efficiency (over load range)
h
HOT
h
20%
R
OUT_COLD
Output resistance
R
OUT_AMB
R
OUT_HOT
Switching frequency
Output voltage ripple
Output inductance (parasitic)
Output capacitance (internal)
Output capacitance (external)
F
SW
V
OUT_PP
L
OUT_PAR
C
OUT_INT
C
OUT_EXT
C
OUT
= 0F, I
OUT
= 25A, V
IN
= 48V,
20MHz BW
Frequency up to 30MHz, Simulated J-lead model
Effective value at 12V
OUT
0
V
IN
= 48V, I
OUT
= 25A; T
CASE
= 100°C
5A < I
OUT
< 25A
I
OUT
= 25A, T
CASE
= -40°C
I
OUT
= 25A, T
CASE
= 25°C
I
OUT
= 25A, T
CASE
= 100°C
95.0
93.5
94.5
94.5
80
4.9
6.3
8.8
1.85
6.7
9.0
11.5
1.95
150
600
47
1000
12.0
14.0
16.0
2.05
285
MHz
mV
pH
µF
µF
mΩ
95.5
95.6
%
%
96.0
%
10ms max, P
OUT_AVG
≤
300W
Worse case of: V
IN
= 55V, C
OUT
= 1000µF,
R
LOAD
= 391mΩ
At P
OUT
= 300W
K = V
OUT
/ V
IN
, at no load
1/4
300
450
30
37.5
10
3
340
38
38
0.5
450
5.3
55
55
1.0
620
6.5
15
9
17
20
8.8
A
A
V/V
W
W
A
A
W
V
V
mA
ms
BCM
®
Bus Converter
Page 4 of 20
Rev 1.8
08/2016
vicorpower.com
800 927.9474
BCM48Bx120y300A00
Electrical Specifications (Cont.)
Specifications apply over all line and load conditions, unless otherwise noted;
boldface
specifications apply over the temperature range of
-40°C
≤
T
CASE
≤
100°C (T-Grade); all other specifications are at T
CASE
= 25ºC unless otherwise noted.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Protection
Input overvoltage lockout threshold
Input overvoltage recovery threshold
Input overvoltage lockout hysteresis
Overvoltage lockout response time
Fault recovery time
Input undervoltage lockout
threshold
Input undervoltage recovery
threshold
Input undervoltage lockout
hysteresis
Undervoltage lockout response time
Output overcurrent trip threshold
Output overcurrent response time
constant
Short circuit protection trip threshold
Short circuit protection response time
Thermal shutdown threshold
V
IN_OVLO+
V
IN_OVLO-
V
IN_OVLO_HYST
T
OVLO
T
AUTO_RESTART
V
IN_UVLO-
V
IN_UVLO+
V
IN_UVLO_HYST
T
UVLO
I
OCP
T
OCP
I
SCP
T
SCP
T
J_OTP
125
Effective internal RC filter
30
1
30
240
28.5
28.5
55.1
55.1
58.5
58.0
1.2
8
300
31.1
33.7
1.6
8
39
5.3
55
380
37.4
37.4
60
60
V
V
V
µs
ms
V
V
V
µs
A
ms
A
µs
°C
375
350
325
50.00
43.75
37.50
31.25
25.00
18.75
12.50
6.25
8.70
9.23
9.76
10.29
10.82
11.36
11.89
12.42
12.95
13.48
14.01
300
275
250
225
200
Output Voltage (V)
P (ave)
P (pk), < 10ms
I (ave)
I (pk), < 10ms
Figure 1
— Safe operating area
BCM
®
Bus Converter
Page 5 of 20
Rev 1.8
08/2016
vicorpower.com
800 927.9474
Output Current (A)
Output Power (W)
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