BCM
®
Bus Converter
MBCM270x338M235A00
(Previous Part – VMB0004MFJ)
®
S
C
US
C
NRTL
US
Isolated Fixed Ratio DC-DC Converter
Features & Benefits
•
270V
DC
–33.75V
DC
235W Bus Converter
•
MIL-STD-704E/F Compliant
•
High efficiency (>95.0%) reduces
system power consumption
•
High power density (>796W/in
3
)
reduces power system footprint by >40%
•
Contains built-in protection features against:
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
Product Ratings
V
IN
= 270V (240 – 330V)
V
OUT
= 33.75V (30 – 41.25V)
(
no load
)
P
OUT
= up to 235W
K = 1/8
Description
The MIL-COTS VI Chip
®
bus converter is a high efficiency (>95.0%)
Sine Amplitude Converter™ (SAC™) operating from a 240 to 330V
primary bus to deliver an isolated 30 – 41.25V secondary voltage.
The MBCM270F338M235A00 is provided in a VI Chip package
compatible with standard pick-and-place and surface mount
assembly processes.
Part Numbering
Product Number
MBCM270x450M270A00
Package Style (x)
F
= J-Lead
T
= Through hole
Product Grade
M
= -55° to 125°C
Typical Applications
•
High Voltage 270V Aircraft Distributed Power
•
28V
DC
MIL-COTS PRM™ Interface (MP028F036M21AL)
•
High Density Power Supplies
•
Communications Systems
For Storage and Operating Temperatures see General Characteristics.
Typical Application
PR
enable / disable
switch
SW1
F1
V
IN
C1
1 µF
-IN
-OUT
-IN
+IN
PC
TM
PC
TM
IL
VC
SG
OS
CD
VC
PC
TM
BCM
+OUT
PRM
+OUT
+IN
VTM
+OUT
+IN
L
O
A
D
-OUT
-IN
-OUT
BCM
®
Bus Converter
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08/2016
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MBCM270x338M235A00
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
the BCM modules will start simultaneously when enabled. The PC
pin is capable of being driven high either 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 23
Rev 1.8
08/2016
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MBCM270x338M235A00
Absolute Maximum Voltage 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
PC to –IN
TM to –IN
+IN/–IN to +OUT/–OUT
+IN/–IN to +OUT/–OUT
+OUT to –OUT
Temperature during reflow
MSL 4 (Datecode 1528 and later)
Isolation voltage (hipot)
Working voltage (IN - OUT)
-1.0
Comments
Min
-1.0
-0.3
-0.3
Max
400
20
7
4242
500
60
245
Unit
V
DC
V
DC
V
DC
V
V
V
DC
°C
BCM
®
Bus Converter
Page 3 of 23
Rev 1.8
08/2016
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800 927.9474
MBCM270x338M235A00
Electrical Specifications
Specifications apply over all line and load conditions, unless otherwise noted;
boldface
specifications apply over the temperature range of
-55°C
≤
T
J
≤
125°C (M-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
K Factor
V
IN
dV
IN
/dt
P
Q
P
NL
I
INR_P
I
IN_DC
K
V
IN
= 270V
DC
V
IN
= 240 – 330V
DC
V
IN
= 270 V
DC
, Average P
OUT
< = 235W, Tpeak < 5ms
No Load
P
OUT
< = 235W
V
IN
= 270V, P
OUT
= 235W
V
IN
= 240V to 330V, P
OUT
= 235W
V
IN
= 270V, T
J
= 100°C, P
OUT
= 235W
60W < P
OUT
< 235W Max
T
J
= 25°C
T
J
= 125°C
T
J
= -55°C
94.1
94
93.7
90
100
130
40
130
180
105
170
210
160
100
1.56
3.12
C
OUT
= 0µF, P
OUT
= 235W, V
IN
= 270V
V
IN
= 270V, C
PC
= 0
460
1.64
3.28
160
540
1.72
3.44
400
620
95.4
95.2
94.7
30
PC connected to -IN
V
IN
= 240 to 330V
V
IN
= 330V C
OUT
= 100µF, P
OUT
= 235W
P
OUT
= 235W
1/8
235
215
352.5
41.25
7.3
2.5
395
240
270
330
1
410
10
4
0.95
V
DC
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
)
P
OUT
P
OUT_P
V
OUT
I
OUT
h
h
h
R
OUT
R
OUT
R
OUT
C
OUT
F
SW
F
SW_RP
V
OUT_PP
T
ON1
W
W
V
A
%
%
%
mΩ
mΩ
mΩ
µF
MHz
MHz
mV
ms
BCM
®
Bus Converter
Page 4 of 23
Rev 1.8
08/2016
vicorpower.com
800 927.9474
MBCM270x338M235A00
Electrical Specifications
Specifications apply over all line and load conditions, unless otherwise noted;
boldface
specifications apply over the temperature range of
-55°C
≤
T
J
≤
125°C (M-Grade); all other specifications are at T
J
= 25ºC unless otherwise noted.
Attribute
Symbol
Conditions / Notes
Min
Typ
Max
Unit
Protection
Input overvoltage recovery threshold
Input overvoltage lockout threshold
Input undervoltage lockout
threshold
Input undervoltage recovery threshold
Output overcurrent trip
Short circuit protection trip threshold
Short circuit protection response time
constant
Thermal shutdown threshold
V
IN_OVLO-
V
IN_OVLO+
V
IN_UVLO-
V
IN_UVLO+
I
OCP
I
SCP
T
SCP
T
J_OTP
V
IN
= 270V, 25°C
350
355
90
100
9
14
0.8
125
1
130
1.2
135
365
372
115
125
12
380
385
125
135
14
V
V
V
V
A
A
µs
°C
400
350
300
Output Power (W)
250
200
150
100
50
0
29.00
31.00
33.00
Steady State
35.00
37.00
5ms 352.5W Ave
39.00
41.00
Figure 1
— Safe operating area
BCM
®
Bus Converter
Page 5 of 23
Rev 1.8
08/2016
vicorpower.com
800 927.9474
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