Vicor’s 28 V MIL-COTS VIPAC™is an integrated power system
leveraging the latest advances in DC-DC converter technology
and modular front ends. VIPAC combines application specific
power processing units (PPU) and a choice of chassis styles to
provide fast, flexible and highly reliable power solutions for a
wide range of demanding applications.
The PPU is the core element of the system and incorporates either
Vicor’s M-FIAM5B or M-FIAM9 to provide transient protec-
ion, EMI filtering and inrush current limiting.
t
The web-based VCAD tool enables designers to configure the
PPU with up to three independently regulated outputs having
power levels from 50 to 400 W. Vicor’s Maxi, Mini, Micro Series
DC-DC converters, in industry standard quarter, half and full
brick packages, are used to deliver output voltages from 3.3 to
48 Vdc. Additionally, the wide trim range of the modules can pro-
vide operating voltages as low as 500 mV.
The PPU is comprised of:
O
ERVIEW
V
PPU
• DC input modular front end
• Vicor’s Maxi, Mini, Micro Series high density
DC-DC converters
• Interface board
• Coldplate or finned chassis
• Choice of output termination styles
The VIPAC is offered in several chassis configurations facilitating
its use in a variety of applications using either conduction,
convection or forced convection cooling. The low profile,
conduction cooled version may be mounted to an existing
cabinet wall, coldplate or heat sink. The 0.5" or 1" finned
versions, available in longitudinal or transverse configurations,
are ideal for use in free or forced convection environments.
The use of standard chassis footprints allowsdifferent input voltage
configurations of theVIPAC to be used interchangeably
depending on system and market requirements.
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re-assembled and Tested Front Ends
P
M-FIAM5B – Filter Input Attenuator Module
-FIAM9 – Filter Input Attenuator Module
M
Rugged Interconnect Board
electable for Single, Multiple
S
r Parallel Outputs
o
Input Options
8 Vdc MIL-COTS version
2
Control Interface
Output Sequencing
BUS-OK /Bus Voltage Monitor
Output Enable / Disable
rotective Features
P
Inrush Current Limiting
nput Transient Protection
I
Auto Restart
EMI Filtering
Platform Options
Low Profile Coldplate
0.5" and 1" Optional Finned Configurations
DC Input
18 – 36 Vdc; 28 V nom.
Vicor’s Maxi, Mini, Micro Series
DC-DC Converters
Output Voltages 0.5 – 48 Vdc
50 – 400 W / Output
(1/4 Brick Modules Shown)
Choice of Output Termination
(LugMate Shown)
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Page 5
EATURES
–Out
–S
SC
+S
+Out
Load
R
D
Trim Down
Error
Amp
1k Ω
1.23 V
0.033 μF
–Out
SC
+Out
Load
R
D
Trim Down
Error
Amp
1 kΩ
1.23 V
0.033 μF
F
•
Control Interface
Power Up / Down control
Output sequencing for Turn-on, Turn-off
BUS-OK
•
Partitioned Power Architecture
Maximizes packaging flexibility
Enhanced reliability
Wide operating temperature range
–40˚ to +95˚C chassis H-Grade
–55˚ to +95˚C chassis M-Grade
•
Secondary Control
Output voltage trimming
10 – 110% Vout
Micro
Mini and Maxi
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NPUT /
I
UTPUT
O
PTIONS
O
Output Voltage Selection
VIPAC
Configuration
MVC-G / MVX-G
MVC-D / MVX-D
MVC-A / MVX-A
# Outputs
Single
Single ll
Dual
Dual ll
Triple
# Outputs
Single
3.3 V 5 V 12 V 15 V 24 V 28 V 36 V 48 VTotal
Micro Maximum Output Power (W)*
75 100 100 100 100 100 100 100 100
150 200 200 200 200 200 200 200 200
75 100 100 100 100 100 100 100
75 100 100 100 100 100 100 100
150 200 200 200 200 200 200 200
75 100 100 100 100 100 100 100
75
75 100100 100100 100 100 100 300
75 100
MiniMaximum Output Power (W)*
150 200 200 200 200 200 200 200 200
100 100 100 100 100 100 100
100 100100 100 100 100
200
300
MVC-E / MVX-E
Single ll
MVC-B / MVX-B
MVC-F / MVX-F
*Model numbers and total output power capability are application specific.
Component tolerances may effect total output power (±5%) in parallel (//) configurations.
See VIPAC configuration tool at: vicorpower.com/vcad
MVC-xxx refers to M-FIAM5B
MVX-xxx refers to M-FIAM9
Dual
# Outputs
Single
300 400 400 400 400 400 400 400 400
150 200 200 200 200 200 200 200
150 200 200 200 200 200 200 200
Maxi Maximum Output Power (W)*
264 400 400 400 400 400 400 400 400
400
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PECIFICATIONS
S
28 Vdc Input MIL-COTS Version
Parameter Min Typ Max Unit Notes
Operating input voltage 18 28 36 Vdc Continuous
Turn-on 18 Vdc
Inrush current 5.0 A pk
Inrush limiting 0.007 A µF
Transient immunity (M-FIAM5B) 50 Vdc 12.5 ms per MIL-STD-704E/F
Transient immunity (M-FIAM9) 100 Vdc 50 ms per MIL-STD-1275A/B/D
250 Vdc 70 ms per MIL-STD-1275A/B/D
70 Vdc 20 ms per MIL-STD-704A
Input to chassis 1,500/2,121 Vrms/Vdc
Operating chassis temperature
H-Grade -40 95 °C
M-Grade -55 95 °C
Shock
(40 g for 15–23 ms, 75 g for 8–13 ms)
Vibration MIL-STD-810F Method 514.5, Procedure 1 (20–2000 Hz at 5 g)
Humidity 5 95 % Non-condensing
MIL-STD-810F
Method 516.5, Procedure 1
Output Specifications - General
Parameter Min Typ Max Unit Notes
Output voltage set point ±1 % Vout nom
Line regulation ±0.02 ±0.2 % Low line to high line; full load
Temperature regulation ±0.002 ±0.005 %/˚C Over operating temp. range
Over temperature shut down 115 ˚C
Power sharing accuracy ±2 ±5 % 10% to 100% of full load
Programming range 10 110 % Of nominal output voltage.
(For trimming below 90% of nominal, a minimum load
of 10% of maximum rated power may be required)
Current limit 115 % Iout max. Output voltage 95% of nominal
Short circuit current 115 % Iout max. Output voltage <250 mV
at 25°C, nominal line and nominal load, per module unless otherwise specified
Interface Control Functions
Type Master Output Output Bus Emergency
Enable Enable/Disable Sequencing OK Off
Local √ √ √
Ρεμοτε √ √ √ √ √
Output Sequencing
Power up will always occur in the defined sequence stored within the device. Any preprogrammed
power down sequence, except the default, will not be in effect upon loss or removal of the VIPAC
source voltage. Sequenced power down can only be achieved by issuing the requisite commands
through the interface before removing the source voltage.
Vicor’s 28 Vdc for MIL-COTS VIPAC front-end section
utilizes either Vicor’s M-FIAM5B or M-FIAM9 input module to
provide EMI filtering, transient protection, inrush current limiting and rectification as appropriate. The front end also contains input connectors, fusing and control circuitry to which
the user can interface discrete circuitry.
Up to three Maxi, Mini, Micro Series DC-DC converters are
combined with the front end in an integrated mechanical as-
sembly providing a high efficiency power supply delivering up
to 400 W of output power.
Circuit Operation
The VIPAC utilizes either the M-FIAM5B or M-FIAM9 module
which provides inrush current limiting, transient protection
and EMI filtering. The DC voltage is applied via an agency approved 3-pin connector; a fuse in the the “+” lead protects the
VIPAC from damage due to internal shorts. At start up, inrush
current is limited by a FET. This FET serves as both an inrush
current limiter at power up and a voltage limiting device in
the event of an input transient over voltage condition.
The FET, driven by a DC bus voltage sense circuit, is brought to
a low impedance after initial power up.
The 28 V is applied to one or more Vicor Maxi, Mini, Micro DCDC converters which deliver the selected output voltage and
urrent levels. TheDC-DC converters provideoutput over volt-
c
age protection, output current limiting, voltage regulation trim
capability and input to output isolation.
Vicor’s VCAD configuration tool selects standard 24 V in Maxi,
Mini, and Micro modules for use within the VIPAC based on
the application requirements. The modules are
chosen based on the input and output requirements and the
closest, but higher power level that is available to that
specified. Specifications for these can be found on their respective data sheets.
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1.5 mA
max.
V
+
r
BUS-OK
+
–
20 mA max.
Disable
MOD-DIS
V
+
+
–
VIPAC
J3
3
2
7
6
ECHNICAL
T
VERVIEW
O
VIPAC Control
The VIPAC provides the user with choices with respect to how
the unit is operated. It can be controlled locally by applying
he appropriate “digital” signals to the device.
t
BUS-OK
An internal replica of BUS-OK is wired to the PC pin of all in-
ternal DC-DC converter modules. The modules will be
disabled (no DC output) during initial power up of theVIPAC
until the internal DC input bus voltage to the DC-DC converters
is sufficient to support full load operation. The BUS-OK status
output reflects the status of this inhibit function. This same
logic circuit will shut down the converters when the internal
DC bus voltage is insufficient to support proper operation.
This shut down will occur during normal power down, line
dropouts exceeding the hold up time, or internal faults
causing the internal DC bus voltage at the input of the
converters to collapse. The BUS-OK output provides the user
with an optically isolated status indication of the internal
DC bus. This output, in AC powered system applications, can
provide power supply status, switch in backup (standby)
sources or initiate “power down”sequences to save volatile
memory contents in the event of a power loss. The time from
BUS-OK deassertion to output shut down is dependent upon
the value of hold upcapacitors used. The VIPAC online design
tool contains a hold up capacitor calculator which provides ap-
propriate values.
MOD-DIS+, MOD-DIS–
The MOD-DIS input is an optically coupled input and allows for
remote disabling of the output(s) of the VIPAC. Applying current
to the MOD-DIS+, MOD-DIS– input disables the supply.
The minimum input current for disabling the supplies is 3 mA.
he maximum allowable current is 20 mA.
T
Electrical Connections
Status output pair BUS-OK+, BUS-OK– are the collector (+) and
emitter (–) of an NPN optoisolator output transistor. In a typical
application, the collector terminal BUS-OK+ of the optocoupler
can be connected via current limiting resistors to a source no
greater than 70 Vdc. These resistors should limit the maximum
current to the optocoupler output transistors to 1.5 mA. The
emitter terminal BUS-OK– is connected to the return of the ex-
ternal source. The status OK condition will set the optocoupler
output transistors in saturation and are capable of sinking up to
1.5 mA with a Vce saturation voltage of 0.4 V. Users should be
cautioned that although the output of the VIPAC can be used as
the pull-up source, shortly after BUS-OK changes from OK
(saturated) to NOT OK (high Z), the pull-up voltage will be shut
down. If the pull-up source is one of theVIPACs outputs, it is
advisable to provide a capacitive reservoir in order to maintain
the pull-up potential after loss of DC current output. Use edge
sensing logicto detect assertion of logic outputs, or a separate
source of bias supply voltage (i.e., backup batteries) to provide a
safe pull-upvoltage source regardless of the line status.
v i c o r p o w e r . c o m
MOD-DIS Input
Apply a current of 3–20 mA
to disable output.
BUS-OK – Status Output
Transistor on when OK.
Vce sat. = < 0.4 V @ 1.5 mA
maximum external pull-up
is 70 Vdc.
VIPACs that contain multiple modules configured as a single output (paralleled
for power or redundancy) MUST have their Outputs and Sense connected to each
other at the load.
DO NOT OPERATE A PARALLEL CONFIGURATION WITH ONLY ONE
MODULE CONNECTED.