BCM48BH120T120A00
BCM48BH120M120A00
(Formerly VIB0101THJ)
BCM
Bus Converter
TM
C
S
NRTL
US
FEATURES
•
48 Vdc – 12 Vdc 120 W Bus Converter
•
High efficiency (>95%) reduces system power
consumption
•
High power density (801 W/in
3
) reduces power system
footprint by >50%
•
“Half Chip” V
•
I Chip package enables surface mount,
low impedance interconnect to system board
•
Contains built-in protection features: undervoltage,
overvoltage lockout, over current protection, short
circuit protection, overtemperature protection.
DESCRIPTION
The V
•
I Chip
TM
Bus Converter is a high efficiency (>95%) Sine
Amplitude Converter
TM
(SAC
TM
) operating from a 38 to 55 Vdc
primary bus to deliver an isolated 12 V nominal, unregulated
secondary. The SAC offers a low AC impedance beyond the
bandwidth of most downstream regulators, meaning that
input capacitance normally located at the input of a 12 V
regulator can be located at the input to the SAC. Since the
K factor of the BCM48BH120T120A00 is 1/4, that capacitance
value can be reduced by a factor of 16x, resulting in savings of
board area, materials and total system cost.
The BCM48BH120T120A00 is provided in a V
•
I Chip package
compatible with standard pick-and-place and surface mount
assembly processes. The V
•
I Chip package provides flexible
thermal management through its low junction-to-case and
junction-to-board thermal resistance. With high conversion
efficiency the BCM48BH120T120A00 increases overall system
efficiency and lowers operating costs compared to
conventional approaches.
•
Provides enable/disable control, internal temperature
monitoring
•
ZVS/ZCS Resonant Sine Amplitude Converter topology
•
Less than 50°C temperature rise at full load in typical
applications
TYPICAL APPLICATION
V
IN
= 38 – 55 V
V
OUT
= 9.5 – 13.75 V (
NO LOAD
)
P
OUT
= 120 W
(NOM)
K = 1/4
•
High End Computing Systems
•
Automated Test Equipment
•
Telecom Base Stations
•
High Density Power Supplies
•
Communication Systems
TYPICAL APPLICATION
PART NUMBER
BCM48BH120T120A00
DESCRIPTION
-40°C – 125°C T
J
, J lead
enable / disable
switch
SW1
F1
POL
TM
PC
POL
+In
V
IN
3.15 A
C1
10 µF
-In
BCM
+Out
V
OUT
-Out
POL
POL
V•I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
v i c o r p o w e r. c o m
Rev. 2.0
12/10
Page 1 of 16
BCM48BH120T120A00 - BCM48BH120M120A00
PRELIMINARY DATASHEET
ABSOLUTE MAXIMUM RATINGS
+IN to –IN . . . . . . . . . . . . . . . . . . . . . . . . . -1.0 Vdc – +60 Vdc
PC to –IN . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 Vdc – +20 Vdc
TM to –IN . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 Vdc – +7.0 Vdc
+IN/-IN to +OUT/-OUT . . . . . . . . . . . . . . . . . . . 2250 V (Hi Pot)
+IN/-IN to +OUT/-OUT . . . . . . . . . . . . . . . . . . . . 60 V (working)
+OUT to –OUT . . . . . . . . . . . . . . . . . . . . . . -1.0 Vdc - +16 Vdc
Temperature during reflow . . . . . . . . . . . . . . . . 245°C (MSL 6)
PACKAGE ORDERING INFORMATION
4
A
3
2
1
CONTROL PIN SPECIFICATIONS
See section 5.0 for further application details and guidelines
.
PC (V
•
I Chip BCM Primary Control)
The PC pin can enable and disable the BCM. When held below
V
PC
-
DIS
the BCM shall be disabled. When allowed to float with
an impedance to –IN of greater than 60 kΩ the module will
start. When connected to another BCM PC pin (either directly,
or isolated through a diode), the BCMs will start simultane-
ously when enabled. The PC pin is capable of being either
driven high by an external logic signal or internal pull up to 5 V
(operating).
TM (V
•
I Chip BCM Temperature Monitor)
The TM pin monitors the internal temperature of the BCM
within an accuracy of +5/-5 °C. It has a room temperature
setpoint of ~3.0 V and an approximate gain of 10 mV/°C. It
can source up to 100 uA and may also be used as a “Power
Good” flag to verify that the BCM is operating.
+In
+Out
B
C
D
J
K
E
F
G
H
-Out
L
M
NC
TM
NC
PC
-In
Bottom View
Signal
Name
+In
–In
NC
TM
NC
PC
+Out
–Out
Designation
A1-B1, A2-B2
L1-M1, L2-M2
E1
F2
G1
H2
A3-D3, A4-D4
J3-M3, J4-M4
V•I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
v i c o r p o w e r. c o m
Rev. 2.0
12/10
Page 2 of 16
BCM48BH120T120A00 - BCM48BH120M120A00
1.0 ELECTRICAL CHARACTERISTICS
Specifications apply over all line and load conditions unless otherwise noted;
Boldface
specifications apply over the
temperature range of
-40°C < T
J
< 125°C (T-Grade);
All other specifications are at
T
J
= 25º
unless otherwise noted
ATTRIBUTE
Voltage range
dV/dt
Quiescent power
No load power dissipation
Inrush current peak
DC input current
K factor
SYMBOL
V
IN
dV
IN
/dt
P
Q
P
NL
I
INR
-
P
I
IN
-
DC
K
P
OUT
P
OUT
-
P
V
OUT
I
OUT
η
η
η
R
OUT
R
OUT
R
OUT
C
OUT
F
SW
F
SW
-
RP
V
OUT
-
PP
T
ON
1
V
IN
= 38 – 55 Vdc; See Figure 14
V
IN
= 46 – 55 Vdc; See Figure 14
V
IN
= 46 – 55 Vdc
Average P
OUT
< = 120 W, Tpeak < 10 ms
Section 3.0
Pout < =120 W
V
IN
= 48 V, P
OUT
= 120 W
V
IN
= 38 V to 55 V, P
OUT
= 100 W
V
IN
= 48 V, T
J
= 100°C, P
OUT
= 120 W
24 W < P
OUT
< P
OUT
Max
T
J
= 25°C
T
J
= 125°C
T
J
= -40°C
8.5
93
90.5
92.6
89
35.4
46.1
27.2
1.60
3.20
C
OUT
= 0 µF, I
OUT
= 10.55 A, V
IN
= 48 V,
Section 8.0
V
IN
= 48 V, C
PC
= 0; See Figure 16
44.1
56.1
35.0
1.75
3.50
140
570
55.8
69.1
45.7
500
1.90
3.80
355
800
94.6
93.7
1/4
97
120
150
14
11.3
W
W
V
A
%
%
%
mΩ
mΩ
mΩ
uF
MHz
MHz
mV
ms
CONDITIONS / NOTES
MIN
38
PC connected to -IN
V
IN
= 48 V
V
IN
= 38 to 55 V
V
IN
= 48 V C
OUT
= 500 µF,
I
OUT
= 10.55 A
TYP
48
68
1.7
5.5
MAX
55
1
150
3.0
3.5
12
3.5
UNIT
Vdc
V/µs
mW
W
A
A
( )
V
OUT
V
IN
Output power (average)
Output power (peak)
Output voltage
Output current (average)
Efficiency (ambient)
Efficiency (hot)
Minimum efficiency
(over load range)
Output resistance (ambient)
Output resistance (hot)
Output resistance (cold)
Load capacitance
Switching frequency
Ripple frequency
Output voltage ripple
V
IN
to V
OUT
(application of V
IN
)
PC
PC voltage (operating)
PC voltage (enable)
PC voltage (disable)
PC source current (startup)
PC source current (operating)
PC internal resistance
PC capacitance (internal)
PC capacitance (external)
External PC resistance
PC external toggle rate
PC to V
OUT
with PC released
PC to V
OUT
, disable PC
V
PC
V
PC
-
EN
V
PC
-
DIS
I
PC
-
EN
I
PC
-
OP
R
PC
-
SNK
C
PC
_
INT
C
PC
_
EXT
R
PC
F
PC
-
TOG
Ton2
T
PC
-
DIS
4.7
2.0
50
Internal pull down resistor
Section 5.0
External capacitance delays PC enable time
Connected to –V
IN
V
IN
= 48 V, Pre-applied; See Figure 16
V
IN
= 48 V, Pre-applied; See Figure 16
50
5.0
2.5
100
150
5.3
3.0
1.95
300
2
400
588
1000
1
100
10
60
60
4
V
V
V
uA
mA
kΩ
pF
pF
kΩ
Hz
µs
µs
V•I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
v i c o r p o w e r. c o m
Rev. 2.0
12/10
Page 3 of 16
BCM48BH120T120A00 - BCM48BH120M120A00
PRELIMINARY DATASHEET
1.0 ELECTRICAL CHARACTERISTICS (CONT.)
Specifications apply over all line and load conditions unless otherwise noted;
Boldface
specifications apply over the
temperature range of
-40°C < T
J
< 125°C (T-Grade);
All other specifications are at
T
J
= 25º
unless otherwise noted
ATTRIBUTE
TM
TM accuracy
TM gain
TM source current
TM internal resistance
External TM capacitance
TM voltage ripple
PROTECTION
Negative going OVLO
Positive going OVLO
Negative going UVLO
Positive going UVLO
Output overcurrent trip
Short circuit protection
trip current
Short circuit protection
response time
Thermal shutdown
junction setpoint
GENERAL SPECIFICATION
Isolation voltage (Hi-Pot)
Working voltage (IN – OUT)
Isolation vapacitance
Isolation resistance
MTBF
Agency approvals / standards
SYMBOL
CONDITIONS / NOTES
MIN
TYP
MAX
UNIT
Actm
A
TM
I
TM
R
TM
-
SNK
C
TM
V
TM
-
PP
-5
10
25
C
TM
= 0 uF, V
IN
= 55 V, P
OUT
= 120 W
75
40
180
+5
100
50
50
250
ºC
mV/°C
uA
kΩ
pF
mV
V
IN OVLO
-
V
IN OVLO
+
V
IN UVLO
-
V
IN UVLO
+
I
OCP
I
SSP
T
SSP
T
J
-
OTP
V
IN
= 48 V, 25°C
55.1
55.5
29.1
30.7
12
15
0.8
125
57.8
58.1
30.8
32.6
20
59.4
59.4
35.4
37.3
25
40
V
V
V
V
A
A
us
°C
1.0
130
1.2
135
V
HIPOT
Vworking
C
IN
-
OUT
R
IN
-
OUT
2250
Unpowered unit
MIL HDBK 217F, 25°C, GB
cTUVus
CE Mark
ROHS 6 of 6
1350
10
1750
7.1
60
2150
V
V
pF
MΩ
Mhrs
V•I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
v i c o r p o w e r. c o m
Rev. 2.0
12/10
Page 4 of 16
BCM48BH120T120A00 - BCM48BH120M120A00
1.1 APPLICATION CHARACTERISTICS
All specifications are at
T
J
= 25ºC
unless otherwise noted. See associated figures for general trend data.
ATTRIBUTE
No load power
Inrush current peak
Efficiency (ambient)
Efficiency (hot – 100°C)
Output resistance (-40°C)
Output resistance (25°C)
Output resistance (100°C)
Output voltage ripple
V
OUT
transient (positive)
V
OUT
transient (negative)
Undervoltage lockout
response time
Output Overcurrent
Response Time
Overvoltage Lockout
Response Time
SYMBOL
P
NL
I
NR
-
P
η
η
R
OUT
_
C
R
OUT
_
R
R
OUT
_
H
V
OUT
-
PP
V
OUT
-
TRAN
+
V
OUT
-
TRAN
-
T
UVLO
T
OCP
T
OVLO
12 < I
OCP
< 25 A
CONDITIONS / NOTES
V
IN
= 48 V, PC enabled; See Figure 1
C
OUT
= 500 µF, P
OUT
= 120 W
V
IN
= 48 V, P
OUT
= 120 W
C
OUT
= 500 µF
V
IN
= 48 V, P
OUT
= 120 W
C
OUT
= 500 µF
V
IN
= 48 V
V
IN
= 48 V
V
IN
= 48 V
C
OUT
= 0uF, P
OUT
= 120 W @ V
IN
= 48,
V
IN
= 48 V
I
OUT
_
STEP
= 0
TO
10.55 A,
I
SLEW
>10 A/us; See Figure 12
I
OUT
_
STEP
= 10.55 A to 0 A,
I
SLEW
> 10 A/us; See Figure 11
TYP
1.75
6
95
94
35
44
56
160
1.4
1.3
2.4
4.4
2.4
UNIT
W
A
%
%
mΩ
mΩ
mΩ
mV
V
V
us
ms
µs
V•I CHIP INC. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
v i c o r p o w e r. c o m
Rev. 2.0
12/10
Page 5 of 16
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