BCM
®
Bus Converter
BCM352x125y300A00
®
S
C
US
C
NRTL
US
Isolated Fixed Ratio DC-DC Converter
Features & Benefits
•
352V
DC
– 12.5V
DC
300W Bus Converter
•
High efficiency (>95%) reduces
system power consumption
•
High power density (1000W/in
3
) reduces
power system footprint by >40%
•
“Full Chip” VI Chip
®
package enables surface mount,
low impedance interconnect to system board
•
Contains built-in protection features against:
n
Undervoltage
n
Overvoltage
n
Overcurrent
n
Short Circuit
n
Overtemperature
•
Provides enable/disable control,
internal temperature monitoring
•
ZVS/ZCS Resonant Sine Amplitude Converter topology
•
Can be paralleled to create multi-kW arrays
Product Ratings
V
IN
= 352V (330 – 365V)
V
OUT
= 12.5V (11.79 – 13.04V)
(
no load
)
P
OUT
= up to 300W
K = 1/28
Description
The VI Chip
®
Bus Converter is a high efficiency (>95%) Sine
Amplitude ConverterTM (SAC
TM
) operating from a 330 to 365V
DC
primary bus to deliver an isolated ratiometric output voltage from
11.79 to 13.04V
DC
. 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 regulator
can be located at the input to the SAC. Since the K factor of the
BCM352x125y300A00 is 1/28, that capacitance value can be
reduced by a factor of 784x, resulting in savings of board area,
materials and total system cost.
The BCM352F125y300A00 is provided in a VI Chip package
compatible with standard pick-and-place and surface mount
assembly processes. The VI Chip package provides flexible thermal
management through its low junction-to-case and junction-to-
board thermal resistance. With high conversion efficiency the
BCM352x125y300A00 increases overall system efficiency and
lowers operating costs compared to conventional approaches.
Typical Application
•
High End Computing Systems
•
Automated Test Equipment
•
High Density Power Supplies
Part Numbering
Product Number
BCM352x125y300A00
Package Style (x)
F
= J-Lead
T
= Through hole
Product Grade (y)
T
= -40° to 125°C
For Storage and Operating Temperatures see Section 6.0 General Characteristics
Typical Application
enable / disable
switch
SW1
F1
V
IN
C1
1µF
PC
TM
POL
BCM
®
+IN
+OUT
V
OUT
-IN
-OUT
POL
POL
POL (8)
BCM
®
Bus Converter
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800 927.9474
BCM352x125y300A00
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
Control Pin Specifications
See Using the Control Signals PC, TM for more information.
PC (BCM Primary Control)
The PC pin can enable and disable the BCM module. When held
below V
PC_DIS
the BCM shall be disabled. When allowed to
float with an impedance to –IN of greater than 50kΩ the
module will start. When connected to another BCM PC pin
(either directly, or isolated through a diode), the BCM modules
will start simultaneously when enabled. The PC pin is capable of
being either driven high by an external logic signal or internal
pull up to 5V (operating).
TM (BCM Temperature Monitor)
The TM pin monitors the internal temperature of the BCM module
within an accuracy of ±5°C. It has a room temperature setpoint of
~3.0V and an approximate gain of 10mV/°C. It can source up to
100µA and may also be used as a “Power Good” flag to verify that
the BCM module is operating.
BCM
®
Bus Converter
Page 2 of 21
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08/2016
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800 927.9474
BCM352x125y300A00
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
+IN/-IN TO +OUT/-OUT (hipot)
+IN/-IN TO +OUT/-OUT (working)
+OUT to –OUT
PC to –IN
TM to –IN
Temperature during reflow
-1
-0.3
-0.3
Comments
Min
-1.0
Max
400
4242
500
16
20
7
245
Unit
V
V
V
V
V
V
ºC
BCM
®
Bus Converter
Page 3 of 21
Rev 2.0
08/2016
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800 927.9474
BCM352x125y300A00
Electrical Specifications
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
= 25ºC unless otherwise noted.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Powertrain
Voltage range
dV / dt
Quiescent power
No load power dissipation
Inrush current peak
DC input current
Transformation ratio
Output power (average)
Output power (peak)
Output voltage
Output current (average)
Efficiency (ambient)
Efficiency (hot)
Efficiency (over load range)
V
IN_DC
dV
IN
/ dt
P
Q
P
NL
I
INR_P
I
IN_DC
K
P
OUT_AVG
P
OUT_PK
V
OUT
I
OUT_AVG
h
AMB
h
HOT
h
20%
R
OUT_COLD
Output resistance
R
OUT_AMB
R
OUT_HOT
Load capacitance
Switching frequency
Ripple frequency
Output voltage ripple
V
IN
to V
OUT
(application of V
IN
)
C
OUT
F
SW
F
SW_RP
V
OUT_PP
T
ON1
C
OUT
= 0µF, P
OUT
= 300W, V
IN
= 352V,
V
IN
= 352V, C
PC
= 0
460
2.13
4.26
2.25
4.5
200
390
PC connected to –IN
V
IN
= 352V
V
IN
= 330V to 365V
V
IN
= 365V, C
OUT
= 1000µF,
P
OUT
= 300W
At P
OUT
= 300W
K = V
OUT
/ V
IN
, at no load
V
IN
= 352V
DC
V
IN
= 330 - 365V
DC
V
IN
= 352V
DC ,
10ms max, P
OUT_AVG
≤
300W
No load
P
OUT_AVG
≤
300W
V
IN
= 352V, P
OUT
= 300W
V
IN
= 330V to 365V, P
OUT
= 300W
V
IN
= 352V, P
OUT
= 300W; T
J
= 100°C
60W < P
OUT
< P
OUT
Max
T
J
= -40°C
T
J
= 25°C
T
J
= 125°C
94.2
94
93.3
90
7
10
14
10
12.5
16.5
14
18
25
1000
2.37
4.74
400
620
µF
MHz
MHz
mV
ms
mΩ
94.6
95.3
11.79
1/28
300
282
450
13.04
26
2
230
7.1
330
352
365
1
370
10
15
4.5
1
V
V/µs
mW
W
A
A
V/V
W
W
V
A
%
%
%
BCM
®
Bus Converter
Page 4 of 21
Rev 2.0
08/2016
vicorpower.com
800 927.9474
BCM352x125y300A00
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
J
≤
125°C (T-Grade); all other specifications are at T
J
= 25ºC unless otherwise noted.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Protection
Input overvoltage lockout threshold
Input overvoltage recovery threshold
Input undervoltage recovery
threshold
Input undervoltage lockout
threshold
Output overcurrent trip threshold
Short circuit protection trip threshold
Short circuit protection response
time
Thermal shutdown threshold
V
IN_OVLO+
V
IN_OVLO-
V
IN_UVLO+
V
IN_UVLO-
I
OCP
I
SCP
T
SCP
T
J_OTP
125
130
V
IN
= 352V, 25ºC
380
366
295
270
32
60
1.2
135
387
383
310
295
42
400
390
325
325
52
V
V
V
V
A
A
µs
°C
500
450
400
350
300
250
200
150
100
50
0
11.40
11.90
P (ave)
12.40
12.90
Output Power (W)
Output Voltage (V)
P (pk) < 10ms
Figure 1
— Safe operating area
BCM
®
Bus Converter
Page 5 of 21
Rev 2.0
08/2016
vicorpower.com
800 927.9474
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