USER GUIDE | UG:122
Power Factor Corrected AC-DC Switcher
Standard Features 2
Optional Features 2
Part Numbering 3
Do's and Don'ts 3
Technical Description 4
"Quick Install" 5
Mechanical Drawings 7 The PFC MicroS is an ultra low profile switching power supply that combines the
advantages of power factor correction (PFC) with high power density. This guide
Output Connections 8 covers both the standard and rugged COTS (MI) versions of the supply. The PFC MicroS
provides up to three isolated outputs (from one slot) and accommodates the following
PFC Micro 8 Vicor DC - DC Converters:
VI-200/VI-J00: 1 full brick or 2 half brick
Power Connections 9 Maxi/Mini/Micro: 1 full brick, 2 half bricks or 3 quarter bricks
User Interface 10 The use of these converters give the PFC MicroS the inherent power flexibility typical of
Connections all Vicor products. Accepting input voltages of 85 Vac to 264 Vac, and 100 to 300 Vdc, the
PFC MicroS can provide up to 600 Watts in a package size of 1.86" H (47mm) x 5.06" W
Specificaitons 16 (128,5 mm) x 7.95" L (201,9 mm). The PFC MicroS is factory configured to meet output
requirements of the user. Using the VSPOC configurator tool available on vicorpower.
Output Power 18 com, anybody can now configure a PFC MicroS (and other Vicor power supplies) online.
Current Share Boards 20
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n Power Factor Correction: Typically 0.98 (>75% Load)
n Universal Input: 85-264 Vac, 47-500 Hz, or 120-300 Vdc
n Power Output: 600 W at 230 Vac (200 Vac minimum input) ; 500 W at 115 Vac
(100 Vac minimum input)
n Up to three isolated outputs (one slot)
n Fan cooled
n Full power to 45°C; half power at 65°C
n Soft start for limiting inrush current
n Conducted EMI: FCC Class A EN 55022, Class A (consult factory)
n Harmonic Distortion to EN61000-3-2
n AC Power OK status signal;
n Output Sequencing and General Shutdown
n Autosense (Refer to Page 6 and 14 for more information on Autosense)
n Output overcurrent protection on all outputs
n Output overvoltage protection (not applicable when using VI-J00 DC-DC Converters)
n Output overtemperature limiting
(not applicable when using VI-J00 DC-DC Converters )
n Ride-through (holdup) time: >20 ms at 500 W load (nominal line)
n Size: 1.86" H (47,3 mm) x 5.06" W (128,5 mm) x 7.95" L (201,9 mm)
n Safety Agency Approvals: CE Marking, TUV CUE
(certain configurations may not have all listed approvals)
n Uses 300 Vdc input VI-200/VI-J00 modules and/or 375 Vdc input
n Power good status signal when Maxi, Mini or Micro modules used
n I/T/H-grade output converters
n Current Share Board for unit to unit power sharing- See Pages 20 - 22
n Connector kits (#19-130044)
n MI Chassis specific options:
n Mil-STD 810 for Shock and Vibration
n Mil-STD 704 and 1399 for Overvoltage and Transients
n -40°C operation
n Conformal coating - contact factory
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PFC MicroS PSx1-x2 x3(x4)-xxxx-x5
x1 = number of outputs
x2 = number of VI-200/VI-J00 modules
x3 = number of Maxi/Mini/Micro modules
(x4 ) = optional Factory assigned
xxxx = sequential number assigned by Vicor
-x5 = optional Factory assigned
Note: x5 = MI for rugged chassis, = MC for rugged chassis with conformal coating
The PFC MicroS can be mounted on one of three surfaces using standard 8 - 32 or 4 mm
screws. Maximum allowable torque is 5 in. lbs., and the maximum penetration of 0.25 (6
mm) on the sides and 0.125 in. (3 mm) on the bottom.
When selecting a mounting location and orientation, the unit should be positioned so
air flow is not restricted. Maintain a 2" (5,1 cm) minimum clearance at both ends of the
PFC MicroS, and route all cables so airflow is not obstructed. The power supply draws
air in at the fan side/AC input side and exhausts air out the load side. If airflow ducting
is used, avoid sharp turns that could create back pressure. The fans move approximately
10 CFM of air.
Avoid excessive bending of output power cables after they are connected to the output
terminals. For high-current outputs, use cable ties to support heavy cables and minimize
mechanical stress on connectors. Be careful not to short-out to neighboring outputs. The
maximum torque recommended on output nuts is 10 in. lbs.
Avoid applications in which the unit is exposed to excessive shock or vibration levels as
the unit is designed primarily for office type equipment. In such applications, a shock
absorbing mount design is required.
PFC MicroS Do’s and Don’ts
n Do not restrict airflow to the unit. The cooling fan draws air into the unit and forces
it out at the output power terminals. A minimum of 2” in front and behind the supply
should be maintained in order to prevent air obstructions.
n Run the output (+/–) power cables next to each other to minimize inductance.
Use twisted pairs if possible.
n Do not attempt to repair or modify the power supply in any manner. In the event of
problems, contact Customer Service at 1-800-735-6200.
n Insert proper fault protection at power supply input terminals (i.e., a fuse).
n Use proper size wires to avoid overheating and excessive voltage drop.
n Output voltages over 60 Vdc, whether from individual modules or series arrays, are
considered as hazardous secondary outputs under UL 60950. Appropriate care must
be taken in design implementation of the supply.
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The PFC MicroS consists of an off-line single phase, power-factor-corrected front end,
EMI filter, cooling fan, customer interface, power supply control circuitry, associated
housekeeping circuits, and a selection of Vicor’s VI-200/VI-J00 and/or Maxi/Mini/Micro
Input AC mains voltage is applied to input connector MBJI. The input current is passed
through an EMI filter designed to meet conducted noise limit "A" specifications of FCC
At start-up, inrush current is limited by a PTC thermistor. The PTC is shunted out
shortly after initial power-up by a DC bus voltage sense circuit driving a relay. After
rectification, the input voltage is put through a boost converter that keeps the AC input
current sinusoidal and synchronized with the input AC voltage (in compliance with
EN61000). The boost converter delivers a regulated input to the hold-up capacitors and
a high voltage backplane. The backplane supplies power to the DC-DC converters that
provide the desired low voltage regulated outputs.
Output voltage conversion is achieved by Vicor’s family of Zero-Current-Switching
(ZCS) DC-DC converters. These are forward converters in which the main switching
element switches at zero current. This patented topology has a number of unique
attributes: low switching losses; high frequency operation, resulting in reduced size for
magnetics and capacitors; excellent line and load regulation; wide adjustment range for
output; low EMI/RFI emission and high efficiencies.
At initial power-up, the PFC MicroS outputs are disabled to limit the inrush current and
to allow the DC bus potential to settle out to the correct operating level. A low-power
flyback converter converts the high voltage DC bus into regulated low voltage to power
the internal housekeeping circuits and DC cooling fan.
The internal housekeeping Vcc comes up within 1 s after the application of input power.
Once the high voltage bus is within operating limits, the AC Power OK signal asserts to a
TTL "1," indicating the input power is OK, and the power outputs will come up
250 ms later.
An output Enable/Disable function is provided to control Vicor’s DC-DC converters.
If the Enable/Disable control pin is pulled low, the modules output is disabled. The
nominal delay associated for an output to come up when measured from release of the
Enable/Disable pin is 9 - 12 ms. The General Shutdown function controls all outputs
simultaneously and works in a similar manner.
PFC MicroS Architecture
Input Line Filter Bridge Soft Start Boost Converter Power
Rectifier Circuit Output Card #1 Output
Customer Power Supply
Enable/Disable -Power Good Read
Fan Power Supply
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PFC MicroS “Quick Install” Instructions
(For Mechanical Drawing, see Page 7)
Mounting the PFC MicroS
n The PFC MicroS can be mounted on either of three sides.
n Use #8 - 32 or 4 mm mounting screws. Maximum penetration should not exceed
0.25 in. (6 mm) on the side and 0.125 in. (3 mm) on the bottom.
n Maintain 2" (5,1 cm) clearance at both ends of power supply for airflow.
Input Power MBJ1
MBJ1-5 PIN n Apply input AC power connector MBJ1.
Not Connected n Maximum torque is 5 in. lbs.
Not Connected n A fuse or circuit breaker in the input line is necessary for safety
GND requirements (10 A).
n Molex mating receptacle 39-01-4051, terminals 39-00-0089, crimp tool
Molex # 11-01-0199.
DUAL MINI MAXI Output Connections
M1 - Power Connections
S1J1 10-32 STUDS Installing bus bars on output studs (when full size and half size modules used):
n The right stud is Positive and the left stud is the Return on single output cards.
M2 - M1 - n Remove the nut and place ring lug over output stud.
M2 + + M1 n Replace and tighten the nut to a torque of 10 inch pounds.
Do Not Over-Tighten Nuts.
S1J1 Installing power connectors with 16 pin Molex connectors (when quarter size modules used):
16 15 14 13 12 11 10 9 n S1J1-7 and S1J1-15 are Positive for output #1, while pins S1J1-8 and S1J1- 16 are the
8 7 6 5 4 3 2 1 Return. S1J1-4 and S1J1-12 are Positive for output #2, while pins S1J1-5 and S1J1- 13
are the Return. S1J1-1 and S1J1-9 are Positive for output # 3, while pins S1J1-2, and
S1J1-10 are the Returns.
S1J1 (16 Pin) n For this 16 pin housing, use Molex mating receptacle #39-01-2160 with
- + T - + N/C - + #39-00-0039 terminals.
- + T - + T - + n Attach 18 - 24 AWG stranded wire using Molex tool #11-01-0197.
See Page 9 for diagrams of output connections.
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Sense Connections Sense Connections on output connections with studs:
Pin n The PFC MicroS is shipped with Auto Sense installed (For more information on
3 + Remote Sense Autosense, refer to Page 14)
- Remote Sense
n For Remote Sense, connect Remote Sense wires to the Trim Connector (S1J2
connector for single outputs, and S1J1/J3 connector for dual outputs).
n Pin 2 is the +Sense and Pin 3 is the -Sense.
n Use Molex mating receptacle #50-57-9403 with #16-02-0103 terminals.
n Attach terminals to 24 - 30 AWG stranded twisted pair wire using
Molex tool # 11-01-0208.
n Attach opposite end of sense lines to point where regulation is desired.
n Verify that sense lines are not cross-connected.
Note: Remote Sense is not available for triple output configurations.
Trim Connections Trim Connections on output connection(s) with studs:
Pin n Pin 1 on the Trim connector provides Trim access. (S1J2 connector for single outputs,
3 + Remote Sense and S1J1/J3 connector for dual outputs).
- Remote Sense
n Use Molex mating receptacle #50-57-9403 with #16-02-0103 terminals.
n Attach 24 - 30 AWG stranded wire using Molex tool #11-01-0208.
S1J1 Trim Connections for output connections with 16 pin Molex connectors:
16 15 14 13 12 11 10 9 n S1J1-14 provides Trim access for output #1, and S1J1-6 provides Trim access for
8 7 6 5 4 3 2 1 output #2, and S1J1-3 provides Trim access for output #3.
S1J1 (16 Pin) Interface Connections
- + T - + N/C - + n CBJ3-1 is Signal Ground, CBJ3-2 is Power Good Read and CBJ3-3 is AC-OK.
- + T - + T - + n CBJ3-7-9 are Enable/Disable (For the PFC MicroS, CBJ3 4-6 are not used/connected),
CBJ3-10 is General Shutdown, CBJ3-11 is Power Good Data Valid (PGDV) and
CBJ3-12 is +5 VS.
CBJ3 E/D INTERFACE CONNECTOR
MATING CONNECTOR: (WESTCOR KIT P/N: 19-130044) n Use Molex mating receptacle #50-57-9412 with #16-02-0097 cinch pins.
HOUSING: MOLEX (50-57-9412)
SOCKET CRIMP 24-30 AWG: MOLEX (16-02-0097) n Attach terminals to 24 - 30 AWG stranded wire.
CRIMP TOOL: MOLEX (11-01-0209)
CBJ3-4 N/C* *For the PFC MicroS, ED4-6
CBJ3-5 N/C* are NOT used/connected.
CBJ3-12 +5 VS
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1.29 32.69 5.100 129.54
CBJ3 E/D INTERFACE CONNECTOR 4 5
MATING CONNECTOR: (WESTCOR KIT P/N: 19-130044)
HOUSING: MOLEX (50-57-9412)
SOCKET CRIMP 24-30 AWG: MOLEX (16-02-0097)
CRIMP TOOL: MOLEX (11-01-0209)
CBJ3 (12 PIN) 1.22 31.04 1
3 2 PIN DESCRIPTION
1 SGND PIN 1 PFC
2 PGR CUSTOMER MOUNTING HOLES 2X.
4 N/C USE 8-32 X .25 or M4 X 6MM MAX LG SCREW
FROM OUTSIDE OF POWER SUPPLY
5 N/C MicroS Mechanical Drawings
7 ED3 3
8 ED2 7.95 201.88 16 PIN CONNECTOR
10 GSD 1 1.86 47.29 10-32 STUDS 10-32 STUDS
11 PGDV .16 4.09
12 +5 VS
AIR M -
vicorpower.com 5.06 128.52 M +
3.500 88.90 S1J1
M - M -
M + M +
.71 18.03 TRIPLE DUAL OUTPUT J2 REMOTE SINGLE OUTPUT
OUTPUT UNIT UNIT PICTURED UNIT PICTURED
Applications Engineering: 800 927.9474 PICTURED (2 JUNIOR OR SENSE/TRIM (1 VI-200 OR
3 3 PIN
(3 MICRO MINI MAXI
1.29 32.69 5.100 129.54 CUSTOMER MOUNTING HOLES 4X. MODULES) J2 REMOTE MODULES)
USE 8-32 X .12 or M4 X 3MM LG SCREW PIN
FROM OUTSIDE OF POWER SUPPLY
MBJ1 (5 PIN)
CUSTOMER MOUNTING HOLES 2X.
L1 MBJ1 A/C INPUT 4 5 USE 8-32 X .25 or M4 X 6MM MAX LG SCREW
FROM OUTSIDE OF POWER SUPPLY See page ??? for detailed output connection information.
N/C MATING CONNECTOR: (WESTCOR KIT P/N: 19-130044)
HOUSING: MOLEX (39-01-4051)
L2/N SOCKET CRIMP 16 AWG: MOLEX (39-00-0089)
N/C CRIMP TOOL: MOLEX (11-01-0199)
GN 1.22 31.04 1
NOTES: UNLESS OTHERWISE SPECIFIED
DIMENSIONS SHOWN ARE FROM BOTTOM SURFACE.
1 MOUNTING PEMNUTS EXTEND .010 PAST BOTTOM SURFACE.
2 ED 4 THRU 6 NOT USED. 1.29 32.82 5.100 129.54
3 ED / REFERENCE DESIGNATION LEGEND:
MB= MOTHER BOARD
CB= CONTROL BOARD
S1 = (SLOT 1) DAUGHTER BOARD MODULES ED 1 THRU 3
4 CONNECTOR PART NUMBERS SPECIFIED ARE MOLEX OR
5 A COMPLETE SET OF MATING CONNECTORS CAN BE
PURCHASED FROM WESTCOR BY SPECIFYING CONNECTOR
KIT P/N 19-130044
Output Connections for the PFC Micro
A. OUTPUT STUDS - SINGLE, DUAL OUTPUTS - when populated with full or half size module(s)
10-32 OUTPUT STUDS
SxJ2 REMOTE SENSE/TRIM MATING CONNECTOR:
PIN CONNECTOR HOUSING: MOLEX (50-57-9403),
+V OUT 3 - SENSE TERMINAL FEM CRIMP 24-30 AWG: MOLEX (16-02-0103)
2 + SENSE USE CRIMP TOOL: MOLEX (11-01-0208)
B. 16 PIN MOLEX CONNECTOR - SINGLE, DUAL, TRIPLE OUTPUTS - when populated with
quarter size modules
8 16 *SxJ1 (16 PIN OUTPUT, REMOTE SENSE MATING CONNECTOR:
7 15 AND TRIM PIN CONNECTOR) 16 PIN HOUSING: MOLEX (39-01-2160)
6 14 TERMINAL FEM CRIMP 18-24 AWG: MOLEX (39-00-0039)
PIN DESCRIPTION PIN DESCRIPTION USE CRIMP TOOL: MOLEX (11-01-0197)
5 13 1 +V OUT M3 9 +V OUT M3
4 12 2 -V OUT M3 10 -V OUT M3
3 11 3 TRIM M3 11 N/C
4 +V OUT M2 12 +V OUT M2
2 10 5 -V OUT M2 13 -V OUT M2
1 9 6 TRIM M2 14 TRIM M1
7 +V OUT M1 15 +V OUT M1
8 -V OUT M1 16 -V OUT M1
Output Connectors for PFC MicroS (PART #19-130044. Available for purchase from Vicor)
Item Qty Description Vendor #1 Part #
1 3 HOUSING 3 POS .100 CTR W/LATCH MOLEX 50-57-9403
2 8 TERMINAL FEM CRIMP 22 - 24 AWG SEL GOLD MOLEX 16-02-0103
** CRIMP TOOL FOR ITEM 2 MOLEX 11-01-0208
3 2 HOUSING 16 POS .165 CTRS W/LATCH MOLEX 39-01-2160
4 2 HOUSING 18 POS .165 CTRS W/LATCH MOLEX 39-01-2180
5 40 TERMINAL FEM CRIMP 18 - 24 AWG SEL GOLD MOLEX 39-00-0039
** CRIMP TOOL FOR ITEM 5 MOLEX 11-01-0197
6 40 TERMINAL FEM CRIMP 16 AWG SEL GOLD MOLEX 45750-3211
** CRIMP TOOL FOR ITEM 6 MOLEX 11-01-0199
7 1 HOUSING 5 POS .165 CTRS W/LATCH MOLEX 39-01-4051
8 5 TERMINAL FEM CRIMP 16 AWG SEL GOLD MOLEX 45750-3211
** CRIMP TOOL FOR ITEM 8 MOLEX 11-01-0199
9 1 HOUSING 12 POS .10 CTRS W/LATCH MOLEX 50-57-9412
10 14 TERMINAL FEM CRIMP 24 - 30 AWG SEL GOLD MOLEX 16-02-0097
** CRIMP TOOL FOR ITEM 10 MOLEX 11-01-0209
** ITEMS FOR REFERENCE ONLY (NOT INCLUDED IN KIT)
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Chassis Input Power Terminals (MBJ1)
Input AC power is applied through connector MBJI using Molex mating connector
39-01-4051. Use 16 AWG wire with Molex Socket Pin 39-00-0090 and Crimp Tool
A fault clearing device, such as a fuse or circuit breaker, with a maximum 10 A rating at
the power supply input is required for safety agency compliance. It should be sized to
handle the start-up inrush current of 8.5 A peak at 115 Vac and 17 A peak at 230 Vac.
Input Power Terminal MBJ1
MBJ1 A/C INPUT MBJ1 (5 PIN)
MATING CONNECTOR: (WESTCOR KIT P/N: 19-130044) L1
HOUSING: MOLEX (39-01-4051) Not Connected
SOCKET CRIMP 16 AWG: MOLEX (39-00-0090) L2/N
CRIMP TOOL: MOLEX (11-01-0199)
Output Power Connections
There are two types of output power terminals available in the PFC MicroS.
For connections using full or half size modules, outputs are terminated at 10 - 32 plated
steel bolts. The positive polarity of the output is the right bolt when viewed from the
output end. For connections using quarter size modules, outputs are terminated using
a single 16 pin Molex connector. Each power output is isolated, so outputs of positive or
negative polarity can be configured through proper selection of the output
In order to minimize parasitic cable inductance and reduce EMI, the output power
cables should be routed in close proximity to one another, and large current loops
should be avoided. To avoid excessive voltage drop, do not undersize power cables,
especially for high current outputs. Do not bundle input AC wires with the output
wires because this can couple output noise into the input wires which can increase
EMI. Excessive cable inductance coupled with large capacitive loading can introduce
instability in switching power supplies. This problem can be avoided with proper
system design. Consult Vicor’s Applications Engineering Department for assistance with
applications that use long cable lengths and excessive load capacitance.
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Output Power Connections 16 15 14 13 12 11 10 9 TRIPLE OUTPUT- Quarter DUAL OUTPUT-Half size SINGLE OUTPUT - Full
8 7 6 5 4 3 2 1 size modules used size module used
S1J1 REMOTE SENSE/OUTPUT CONNECTORS
MATING CONNECTORS: (WESTCOR KIT P/N: 19-130044) - M1 10-32 STUDS
16 PIN HOUSING: MOLEX (39-01-2160) S1J1
SOCKET CRIMP 18-24 AWG: MOLEX (39-00-0039)
CRIMP TOOL: MOLEX (11-01-0197) 5.06 128.52 + M1
S1J1 (16 PIN, TRIPLE MICRO MODULES) - REMOTE SENSE
PIN DESCRIPTION PIN DESCRIPTION A3J1 3
2 + REMOTE SENSE
1 Trim Pin
S1J1-1 +V OUT M3 31J1-9 +V OUT M3 M2 - -
S1J1-2 -V OUT M3 S1J1-10 -V OUT M3 M1
S1J1-3 TRIM M3 S1J1-11 N/C
S1J1-4 +V OUT M2 S1J1-12 +V OUT M2 S1J3 S1J2
S1J1-5 -V OUT M2 S1J1-13 -V OUT M2 + M2
S1J1-6 TRIM M2 S1J1-14 TRIM M1 + M1
S1J1-7 +V OUT M1 S1J1-15 +V OUT M1
S1J1-8 -V OUT M1 S1J1-16 -V OUT M1
S1J1/J3 REMOTE SENSE/TRIM PIN ACCESS CONNECTOR S1J2 REMOTE SENSE/TRIM PIN ACCESS CONNECTOR
MATING CONNECTOR: (WESTCOR KIT P/N: 19-130044) MATING CONNECTOR: (WESTCOR KIT P/N: 19-130044)
HOUSING: MOLEX (50-57-9403) HOUSING: MOLEX (50-57-9403)
SOCKET CRIMP 24-30 AWG: MOLEX (16-02-0103) SOCKET CRIMP 24-30 AWG: MOLEX (16-02-0103)
CRIMP TOOL: MOLEX (11-01-0208) CRIMP TOOL: MOLEX (11-01-0208)
User Interface Connections
Signal Ground (CBJ3-1)
Signal Ground on CBJ3-1 is an isolated secondary ground reference for all CBJ3
interfacing signals. This is not the same as Earth Ground on input power
Bi-directional I/O lines (CBJ3-7 to CBJ3-9)
(Enable/Disable or Module Power Good Status)
Enable/Disable mode is the default condition for these I/O lines. In this mode, the
control pins allow the outputs to be sequenced either ON or OFF. To disable a module,
the E/D pin should be pulled low to less than 0.7 V with respect to Signal Ground. The
E/D lines will typically source 250 mA (1 mA max.) under this condition. To enable a
module, a E/D pin should be open circuited or driven high to a logic high voltage of
3.5 V (40 mA typical) or greater not to exceed 5 V.
The correspondence between a module and its E/D line as seen from the output end of
the power supply goes from left to right. The PFC MicroS power supply is a one slot box.
E/D1, E/D2, and E/D3 are present in this slot. (E/D4, E/D5, E/D6 are NOT used/connected
in the PFC MicroS). See Table 1. E/D1 corresponds with VOUT M1, E/D2 corresponds with
VOUT M2 and E/D3 corresponds with VOUT M3.
Table 1. Slot 1
Enable/Disable Mode E/D1 E/D2 E/D3
Maxi Modules X
Mini Modules X X
Micro Modules X X X
VI-200 Modules X
VI-J00 Modules X X
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Module Power Good Status Mode
The power supply will enter the Power Good Status Mode when logic high (50 mA
typical) is applied to Power Good Read (PGR) pin (CBJ3-2). After transitioning to PGR
mode the I/O lines (CBJ3-4 to CBJ3-9) will be outputs and will give a onetime readout
of the associated module status. These outputs give an indication of the status of the
modules of the power supply at the time of transition to PGR. A TTL "1" (>3.5 V) on
a line indicates the module is ON and functioning properly, and a TTL "0" (<0.7 V)
indicates the module is either OFF or is not functioning properly. The correspondence
between the module and the Power Good Status of that module is the same as between
a E/D pin and its module. This mode does NOT constantly monitor the module status
and must be re-triggered by transitioning the PGR pin from logic low to logic high to get
current module status.
Procedurally, certain guidelines must be followed when using this feature. Upon
application of a logic high on the Power Good Read (PGR) pin, the user must change its
E/D interface (CBJ3-4 to CBJ3-9) from outputs to inputs within 3 ms. The Power Good
Status data will be valid on the E/D lines when the Power Good Data Valid (PGDV) pin
(CBJ3-11) asserts to a logic high. The power good status measurement takes typically
200ms. While in the Power Good Read Mode (PGR = 1) the individual shutdown lines
are not functional. However, General Shut Down (GSD) is functional. Leaving the Power
Good Read mode is accomplished by removing the logic high or applying a logic low
(<0.7V) to the Power Good Read (PGR) pin (CBJ3-2). The user must change its E/D
interface (CBJ3-4 to CBJ3-9) from inputs to outputs between 1 ms and 4 ms of the time
the PGR low is applied to pin CBJ3-2.
Note: If any model is disabled by the user when a Power Good Read is requested (PGR = 1), that module
will remain off during the Power Good Read and status of said module will be power not good (<0.7 V).
Power Good Read status data on open E/D lines are not valid. An open E/D line is a E/D pin where there
is no module associated with said E/D line (i.e. A power supply with two Maxi modules, Data on E/D2,
E/D3 and E/D5 and E/D6 are NOT valid.
The Power Good Status Mode feature is only valid when Maxi, Mini and/or Micro
modules are used.
The following page shows examples of triggering PGR with a 1 Hz square while
monitoring PGDV and a selected E/D line with a good module and a defective one.
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with Good Module
with Defective Module
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General Shutdown /GSD (CBJ3-10)
The GSD control pin on CBJ3-10 allows simultaneous shutdown of all outputs. This
pin must be pulled down to less than 0.7 V, and will typically source 250 mA (1 mA
maximum) to shut down all outputs. The GSD pin should be open circuited or driven
high to a logic high voltage of 3.5 V or greater when not in use, or when the outputs are
to be enabled. Do not apply more than 5 V to this input at any time.
AC OK (CBJ3-3)
AC OK is an active high TTL compatible signal and provides a status indication of the AC
input power. It is on pin CBJ3-3 and is capable of sinking 5 mA maximum. This signal
switches to a TTL "1" when the high voltage bus exceeds low-line condition during turn-
on. Upon loss of input power, the bus voltage will drop, causing the AC OK signal to go
low. Typically, a 3 ms holdup time is provided for a 500 W load following the loss of the
AC OK signal.
Auxiliary Vcc +5V/40mA (CBJ3-12)
The Vcc on CBJ3-12 is an auxiliary 5 V regulated power source. It is +5 Vdc +/–5% with
respect to Signal Ground and can supply 40 mA maximum. It is short-circuit-proof, but
shorted user interface functionality will be lost.
Auxiliary Vcc CBJ3
+5V/40 mA CBJ3-12 Auxiliary Vcc
CBJ3-1 Signal Ground
Power Good Read (PGR, CBJ3-2)
This pin initiates the Power Good Read sequence. A logic high applied to this pin will
cause the power supply to enter the Power Good Read status mode. In this mode, the I/O
lines (CBJ3-4 to CBJ3-9) will be outputs. These outputs give an indication of the status
of the modules of the power supply. A high on an I/O line (CBJ3-4 to CBJ3-9) indicates
a module is ON and functioning and a low indicate the module is OFF or in a fault
condition. The Power Good Status data will be valid on the ED lines (CBJ3-4 to CBJ3-9)
when the Power Good Data Valid (PGDV) pin (CBJ3-11) asserts a logic high. Applying
a logic low or opening the PGR pin puts the power supply back in the Enable/Disable
mode. Instructions for using this function are on Page 11 under Module Power Good
Power Good Data Valid (PGDV- CBJ3-11)
Upon entering the Power good Read status mode (PGR = 1, CBJ3-2), the data will not
be valid on the I/O lines (CBJ3-7 to CBJ3-9) until the PGDV pin asserts itself logic high.
This pin can source up to 5 mA. When this pin is logic low, Power Good status data is not
valid or the power supply is not in the Power Good Read status mode.
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 13
+Sense/–Sense (S1J2 and S1J1/J3 connectors)
The sense lines for the outputs are shipped from the factory with Autosense. Autosense
provides the user with automatic sensing of the outputs. With Autosense, the PFC
MicroS will operate in a Remote Sense mode when the Remote Sense connections are
made. But in the event that the Remote Sense is not connected or needed, no Local
Sense selection is necessary - simply hook up the outputs and the PFC MicroS will
automatically operate in Local Sense mode. To check if an output has the Autosense
feature, measure the impedance from the + Out to + Sense and - Out to - Sense pins.
If the impedance is 5 ohms, then the output has Autosense and does not require local
In the local sense mode (Remote Sense lines not connected), the power supply will
regulate the output at the output terminals. The voltage appearing at the load may
drop slightly due to voltage drop in the power cables. If it is necessary to compensate
for voltage drop along the output power cables, the output can be trimmed up or
configured for Remote Sense. Use stranded twisted pair 20 - 22 AWG wire for the Remote
Sense lines. Remote Sense can compensate for a voltage drop of up to 0.5 V, or 0.25 V
on each leg.
The Sense connector for a single and dual output board is a 3 pin connector providing
the +Sense connection on Pin 2 and the -Sense connection on Pin 3.
Remote Sense is not available for triple output configurations.
Remote Sense +Out
Load Use 20-22 AWG
Twisted Pair Wires
External Trim (S1/S2 J2)
The Trim pin (S1J2 connector for single outputs, and S1J1/J3 connector for dual
outputs) is referenced to the –Sense pin and can be used for external control of the
output voltage. For triple output cards, the Trim pins are available on S1J1-14, S1J1-6
and S1J1-3 for outputs 1, 2 and 3 respectively. A 10% increase to the trim pin voltage
will result in a 10% increase in output voltage. Reducing the trim pin voltage by 10%
will result in a 10% decrease in output voltage.
Table 2. Output Module Vref RTH
Module Internal Reference VI-200/VI-J00 ³3.3 V 2.50 V 10.0 kW
Voltages and Thevenin
Resistances VI-200/VI-J00 < 3.3 V 0.97 V 3.88 kW
Maxi (Predefined) 1.23 V 1.0 kW
Maxi ( User defined) 1.23 V Consult Factory
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 14
External Pin Use 20-22 AWG
Twisted Pair Wires
+P +Out (Remote Sense)
PIN 2 +Sense
To Error PIN 1 Load
Ref. PIN 3 -Sense
Use 20-22 AWG Twisted Pair Wires
±10% Trim adjust on a 12 V nominal output.
Figure 8 shows a typical variable trim circuit. Using a 10 k trimpot (R7), the resistor
values for R6 and R8 can be calculated as follows:
V1= Vref + 10% = 2.75 V Given: Vref = 2.5 V (see Table 2)
IR5 = (2.75 V - Vref)/RTH = (2.75 V - 2.5 V) Given: RTH = 10 kW (see Table 2)
/10 kW = 25 mA
Setting the bottom limit:
VR6 = 2.5 V - 10% = 2.25 V
And since IR5 = IR6 = 25 mA,
R6 = VR6/IR6= 2.25 V/25 mA = 90 kW
V2 = V1 + VR6 = 2.75 V + 2.25 V = 5 V
IR7 = V2/R7 = 5 V/10 kW = 500 mA
IR8 = IR7 + IR6 = 525 mA
VR8 = (Vnom +10%) - V2 = 13.2 V - 5 V = 8.2 V Given: Vnom = 12 V
R8 = VR8/IR8 = 8.2 V/525 mA = 15.62 kW
CONSULT APPLICATIONS ENGINEERING WHEN TRIMMING OUTPUTS BELOW 5 V.
Single Output Power Supplies (Arrays)
Vicor's standard configuration for single output power supplies is to set the left module
(as seen from looking at the power supply output) as the controlling module of the
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 15
Specifications (Typical at 25°C, nominal line and 75% load, unless otherwise specified)
Number of Outputs 1-3
Modules VI-200/VI-J00: One VI-200 or Two VI-J00s
Maxi/Mini/Micro: One Maxi, Two Minis or Three Micros
Efficiency Typically > 75%
cURus – UL 60950-1, CSA 60950-1;
Safety Agency Approvals cTUVus – EN 60950-1, UL 60950-1, CSA 60950-1
CE Mark – Low Voltage Directive, 2006/95/EC
Note: certain wide temp range units will not carry all approvals
Maximum Output Power 500 W at 115 Vac, (100 Vac minimum input)
600 W at 230 Vac, (200 Vac minimum input)
Input 85 - 264 Vac, 47-500Hz
120 - 300 Vdc (see derating charts on Page 18)
VI-200/VI-J00 0.2% max. from 10% to full load
Line/Load Regulation 0.5% max. from no load to 10% load
Maxi/Mini/Micro 0.20% max to 0.30% max
Maxi/Mini/Micro 0.20% max to 0.70% max
Inrush Current 8.5 A peak @ 115 Vac
17 A peak @ 230 Vac
Ride Through Time >20 ms at 500 W load (nominal line)
FCC Class A
Conducted EMI EN 55022 Class A (consult factory)
Mil-STD 461 requires external filter
Power Factor Typically >.98 (>75% Load)
Transient Burst Immunity EN61000-4-4, Level 3, Performance Criteria A
Surge Immunity EN 61000-4-5, Level 3, Performance Criteria B
(Common Mode & Normal Mode) (Temporary loss of output power may occur which is self recoverable.)
Dielectric Withstand Primary to Chassis GND = 2,121 Vdc
Secondary to Chassis GND = 750 Vdc
Overvoltage and Transients Compliant to Mil-STD 704 and 1399 based on configurtion contact factory
(MI chassis only)
Output (VI-200/VI-J00 Modules)
Parameter Min Typ Max Units Notes
Setpoint Accuracy  0.5 1 % of VNOM
Load/line Regulation 0.05 0.5 % LL to HL,
10% to Full Load
Load/line Regulation 0.2 0.5 % LL to HL,
No Load to 10%
Temperature Regulation 0.01 0.02 %/°C Over rated temp.
Long Term Drift 0.02 %/K hours
Output Ripple & Noise:
£ 10 V out 100 mV 20 MHz
> 10 V out 1.0 % VOUT bandwidth
Voltage Trim Range: ± 10% on
VI-200/VI-J00 Slots 50-110 % VOUT 10 - 15 VOUT
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 16
Total Remote Sense 0.5 Volts Autosense.
Compensation See Pages 6 & 14
OVP Set Point  115 125 135 %VOUT Recycle Power
Current Limit 105 115 125 % of I max Auto Recovery
Short Circuit Current 120 (105 ) 130 %
Overtemperature Limiting Not available on
Maxi, Mini and Micro Series Modules
Parameter Min Typ Max Units Notes
Setpoint Accuracy  ±0.5 ±1 % of VNOM
Load/line Regulation ±0.08 ±0.45 (±7) % of VNOM 0% to 100%
Temperature Regulation 0.002 0.005 %/°C -20 to 100°C
Long Term Drift 0.02 %/K hours
Output Ripple and noise:
£ 10 V out 100 mV 20 MHz
> 10 V out 1.0 %VOUT bandwidth
Voltage Trim Range: Preload may be
Maxi/Mini/Micro Slots 10-110 % Vout required
Total Remote Sense 0.5 Volts Autosense. See
Compensation Pages 6 & 14.
OVP Set Point 112 135 % of VOUT Recycle power
Current Limit 102 115 135 % of I max Auto Recovery
Overtemperature Limiting Not available
Storage Temperature -40°C to +85°C
Full Power -20°C to +45°C (-40°C to +45°C option w/ MI chassis)
Half Power -20°C to +65°C (-40°C to +60°C option w/ MI chassis)
Altitude Derate 2.6% total output power for each 1,000 ft to a maximum operating
altitude of 15,000 ft. Non-operating storage maximum altitude is 40 K.
Shock and Vibration Mil-STD 810
Humidity 0 to 95% non condensing
Product Weight 3.1 lbs. (1,4 kg)
Dimensions 1.86" H (47,3 mm) x 5.06" W (128,5 mm) x 7.95" L (201,9 mm)
Warranty 2 years limited warranty. See vicorpower.com for complete warranty statement.
 Note: Not to exceed an input current of 7.5 A
 See Vicor module specifications. A preload may be necessary for modules trimmed down below
90% of normal output voltage.
 For special and adjustable voltages, maximum setpoint accuracy is 2% of VNOM.
 131% Nominal for Booster Modules. No OVP for VI-J00.
 VI-J00 modules only.
 For special, adjustable voltages and 48 Vdc outputs, maximum setpoint accuracy is 2% of VNOM.
Note: See individual module datasheets for specific module specifications.
 Note: Micro Modules do not support remote sense.
 Opening, repairing or modifying the unit will void the warranty. If you have any problem with the
power supply, please contact Customer Service at 1-800-735-6200. If the unit needs to be returned
for inspection/analysis, an RMA number will be issued. All units must have a RMA number
prior to return.
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 17
Output Power Derating
PFC Micro Output Power
vs. AC Input Voltage
PFC MicroS Output Power vs. AC Input Voltage
Output Power (Watts) 550 Power Limit Exceeded
Safe Operating Area
450 8.33 Watts/Volt
85 95 105 115 125 135 145 155 165 175 185 195 205 215 225 235 245 255 265
Input Voltage (VAC)
PFC Micro Output Power
vs. DC Input Voltage
PFC MicroS Output Power vs. DC Input Voltage
Output Power (Watts) Power Limit Exceeded
Safe Operating Area
100 120 140 160 180 200 220 240 260 280 300
Input Voltage (DC)
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 18
PFC Micro Output Power
PFC MicroS: Output Power Temperature Derating
Output (Watts) 400
0 45 65
1. For all module configurations. The PFC MicroS or an individual output may be
limited by module power limitations e.g. 5 V Maxi module is 400 W maximum.
One cannot exceed the output power rating of the PFC MicroS regardless of the
2. Also see Output Power vs Input Voltage charts on Page 18.
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 19
Current Share Boards - Optional Feature
"Current sharing" also known as Load Sharing, is the ability to divide the output current
evenly across all active power supplies. This greatly reduces stresses on each power
supply and allows them to run cooler, resulting in higher reliability. Standard "current
sharing" techniques typically utilize shunt resistors or Hall Effect devices to measure
the current from each power supply. Power shunt resistors continually dissipate power
and require cooling especially when dealing with high output currents of >100 Amps.
Hall Effect devices measure magnetic fields generated by current flowing through a
conductor and, although they dissipate no power, they tend to be large and expensive.
First developed by Vicor Engineering for paralleling MegaPAC supplies, the
Box-to-Box Current Share Board or CSB allows two or more Vicor power supplies to
current share by utilizing the inherent voltage drop produced in the negative output
return cable. This eliminates the need for additional shunt resistors or expensive Hall
Effect devices and provides a simple 5 wire connection method to achieve a +/-1 mV
accuracy between the Negative Output power rails. This accuracy translates to a 1%
current sharing if there is a total of 100 mV conductional voltage drop in the negative
Constructed as a current source to drive the Trim pin of a Vicor module, the design
uses an accurate comparator circuit to monitor the power returns. In addition, the
circuit is unidirectional and can only trim an output voltage up. The benefit is that
only the supply that is supporting less current is adjusted up. This action balances the
currents to the load by matching the output voltages of the supplies. In the case of one
supply failing, the circuit will attempt to trim the failed supply only. This will leave the
remaining functional supply alone to provide power to the load at its nominal voltage.
Thus the circuit also offers simple redundancy. In addition, because CSB functions as
a current source, the Trim outputs (T1 and T2) of the CSB can be placed in parallel to
create a summing node. This allows current sharing between more than two supplies by
paralleling the T2 output of one CSB circuit with the T1 output of the next CSB.
Please Note: The CSB is not intended for use in Hot-swap Applications.
CSB Interconnect Expample D*
Supply # 1 TRIM Yellow
5V @ 120A
-V1 Power Red
+OUT D* -VOUT
Supply # 2 TRIM White
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 20
Current Share Boards - Optional Feature (Cont.)
1. For proper operation, the power supplies being paralleled should be enabled at the
2. –Out conductors must be of equal length and wire gauge. Separate –Out conductors
must be used from each supply to the load, or the use of a "Y" connection to a
common point must be used as shown in Figure 12. Each leg of the "Y" must have a
minimum of a few millivolts of drop in order for proper operation. 50 mV to 100 mV
of drop will provide from 5% to 1% accuracy.
3. –V1 and –V2 for all Box-to-Box circuits must be connected directly at the negative
output power studs or terminals to achieve accurate current sharing.
4. D* can be added if redundancy is needed. If redundancy is not required, D* can be
replaced with direct wire connections.
5. When using D*, the Power input should be connected on the cathode side of the
paralleling diodes as shown above.
6. Terminate Sense Leads either locally or remotely as shown in Figure 12.
7. For paralleling more than two supplies, consult factory for assistance.
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 21
Current Share Boards - Optional Feature (Cont.)
0.13" (3.3mm) Dia Non
Plated thru hole 4
Molex CT43045F surface mountable
1.74" 1.500" connector. .390" height above board.
4 T2 0.12"
5 -V2 (3.0mm)
6 No Connection 0.12" 0.900"
Figure 13. Mechanical Drawing
24.0" +/- 1.0"
Red, 22 AWG Power
Yellow, 22 AWG T1
P1 Brown, 22 AWG -V1
White, 22 AWG T2
Black, 22 AWG -V2
Figure 14. Cable Drawing
1. Power: 2 - 50 Vdc at 5 mA maximum.
2. Accuracy: +/– 1 mV between –VOUT connections.
3. Output current when not trimming up: +/– 1 µA (VI-200/J00), +/–5 µA
4. Use 4 non-plated through holes with standoffs for mounting.
5. CSB01 MUST be used for current sharing VI-200/VI-J00 converters.
6. CSB02 MUST be used for current sharing Maxi/Mini/Micro converters.
PLEASE NOTE, THE CSB IS NOT INTENDED FOR HOT-SWAP APPLICATIONS
Contact your Regional Applications Engineer at 1-800-927-9474
for additional information.
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 22
UG:122 vicorpower.com Applications Engineering: 800 927.9474 Page 23
For Vicor Global Office Locations, please go to: www.vicorpower.com/contact-us
or call 800-735-6200.
For more information about this or other Vicor products, or for assistance with component-based power
system design, contact the Vicor office nearest you. Vicor's comprehensive line of power solutions includes
modular, high-density DC-DC converters and accessory components, configurable power supplies, and custom
power systems. Vicor, designs and builds configurable power supplies incorporating high density DC-DC
converters and accessory components.
This product line includes:
• PFC MicroS
• PFC Micro
• PFC Mini
• PFC MegaPAC
• 4kW MegaPAC
• PFC MegaPAC (High Power)
• PFC MegaPAC-EL
• Mini MegaPAC
Rugged COTS versions (MI) are available for the PFC Micro, PFC MicroS, PFC Mini and PFC MegaPAC.
INFORMATION FURNISHED BY VICOR IS BELIEVED TO BE ACCURATE AND RELIABLE. HOWEVER, NO RESPON-
SIBILITY IS ASSUMED BY VICOR FOR ITS USE. NO LICENSE IS GRANTED BY IMPLICATION OR OTHERWISE
UNDER ANY PATENT OR PATENT RIGHTS OF VICOR. VICOR COMPONENTS ARE NOT DESIGNED TO BE USED
IN APPLICATIONS, SUCH AS LIFE SUPPORT SYSTEMS, WHEREIN A FAILURE OR MALFUNCTION COULD RESULT
IN INJURY OR DEATH. ALL SALES ARE SUBJECT TO VICOR'S TERMS AND CONDITIONS OF SALE, WHICH ARE
AVAILABLE UPON REQUEST.
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE. THE LATEST DATA IS AVAILABLE ON THE
VICOR WEBSITE AT VICORPOWER.COM
The Power Behind Performance
Rev 1.1 12/2014 P/N 03-00049 vicorpower.com Applications Engineering: 800 927.9474 Page 24
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