BCM
®
Bus Converter
BCM48Bx320y300A00
®
S
C
US
C
NRTL
US
Isolated Fixed-Ratio DC-DC Converter
Features & Benefits
•
48 – 32.0V
DC
300W Bus Converter
•
High efficiency (>96%) reduces system
power consumption
•
High power density
reduces power system footprint by >40%
•
Contains built-in protection features:
Undervoltage
Overvoltage Lockout
Overcurrent Protection
Short circuit Protection
Overtemperature Protection
•
Provides enable / disable control,
internal temperature monitoring
•
Can be paralleled to create multi-kW arrays
(>1022W/in
3
)
V
IN
= 48V (38 – 55V)
V
OUT
= 32.0V (25.3 – 36.7V)
(No Load)
Product Ratings
P
OUT
= up to 300W
K = 2/3
Product 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
25.3 to 36.7V
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 BCM48Bx320y300A00 is 2/3, the capacitance value
can be reduced by a factor of 2.25x, resulting in savings of board
area, materials and total system cost.
The BCM48BF320y300A00 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 BCM48Bx320y300A00 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
BCM48Bx320y300A00
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
Page 1 of 20
Rev 1.4
10/2018
BCM48Bx320y300A00
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 1.4
10/2018
BCM48Bx320y300A00
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
–2
–2
–0.3
–0.3
Operational
Comments
Min
–1
–1
Max
60
1
2250
0
11.75
9.4
20
7
Unit
V
V/µs
V
V
A
A
V
V
BCM
®
Bus Converter
Page 3 of 20
Rev 1.4
10/2018
BCM48Bx320y300A00
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
= 38 – 55V, T
CASE
= 25ºC
V
IN
= 38 – 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
≤ 9.4A
V
IN
= 48V, I
OUT
= 9.4A; T
CASE
= 25°C
Efficiency (Ambient)
h
AMB
V
IN
= 38 – 55V, I
OUT
= 9.4A; T
CASE
= 25°C
V
IN
= 48V, I
OUT
= 4.7A; 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
= 9.4A, V
IN
= 48V,
20MHz BW
Frequency up to 30MHz, simulated J‑lead model
Effective value at 32.0V
OUT
0
V
IN
= 48V, I
OUT
= 9.4A; T
CASE
= 100°C
1A < I
OUT
< 9.4A
I
OUT
= 9.4A, T
CASE
= –40°C
I
OUT
= 9.4A, T
CASE
= 25°C
I
OUT
= 9.4A, T
CASE
= 100°C
95.0
93.0
95.0
92.8
87.0
35.0
53.0
75.0
1.57
70.0
97.4
113.5
1.60
310
600
4
100
87.0
120.0
140.0
1.63
500
MHz
mV
pH
µF
µF
mΩ
96.2
94.5
%
%
96.2
%
10ms max, P
OUT_AVG
≤ 300W
Worse case of: V
IN
= 55V, C
OUT
= 100μF,
R
LOAD
= 3307mΩ
At P
OUT
= 300W
K = V
OUT
/ V
IN
, at no load
2/3
300
375
9.4
11.75
9
2.0
550
38
38
2.5
670
3.5
55
55
4.0
800
5.0
8.0
6
9
25
8.2
A
A
V/V
W
W
A
A
W
V
V
mA
ms
BCM
®
Bus Converter
Page 4 of 20
Rev 1.4
10/2018
BCM48Bx320y300A00
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
20
1
11
240
28.5
28.5
55.1
55.0
59.0
56.0
1.2
8
300
31.1
33.7
1.6
8
14
3.8
19.5
380
37.4
37.4
60
60
V
V
V
µs
ms
V
V
V
µs
A
ms
A
µs
°C
450
400
350
24
21
18
15
12
9
6
3
0
26.0
28.0
30.0
32.0
I (ave)
34.0
36.0
I (pk), < 10ms
38.0
Output Power (W)
300
250
200
150
100
50
24.0
Output Voltage (V)
P (ave)
P (pk), < 10ms
Figure 1
— Safe operating area
BCM
®
Bus Converter
Page 5 of 20
Rev 1.4
10/2018
Output Current (A)
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