VICOR VITA62 3U User manual

UG:801 Page 1
Introduction
The VITA62 3U evaluation platform described in this document is primarily designed to be used with the
following power supplies.
1. VIT028x3U600y000
2. VIT270wxx600yzzz
3. SOS028x3U800y000 (requires removal of guide pin KM1)
The focus of this document is to assist the user in using the evaluation platform with 3U form factor
VITA62 and SOSA™-aligned power supplies.
It is important to remember that power supplies evaluated with this test platform have no means of
cooling other than through natural convection. If power supplies are left powered on for extended
periods of time, they will overheat. It is recommended to use forced-air cooling aimed at the heat sink
of the power supply to provide active forced cooling when the unit is powered on.
VITA62 3U Evaluation Board
USER GUIDE | UG:801
Introduction 1
Contents 2
Features 2
Recommended Parts
(not included) 2
Board Description 3
General Components 3
Bill of Materials 8
Connection Cross-Reference 9
Testing I2C Communication 10
Contents Page

UG:801 Page 2
IMPORTANT NOTICE:
Read the precautions below entirely BEFORE using the VITA62 3U Evaluation Board. Do not operate
the evaluation board unless you have the appropriate safety precautions in place on your bench to
guarantee safety.
The list below is not comprehensive and is not a substitute for common sense and good practice.
n The evaluation platform is capable of accepting both 270VDC and 28VDC power supplies. By default,
the evaluation platform is assembled to accept 28V power supplies. In order to accept 270V supplies,
the appropriate guide pin needs to be rotated to accept 270V supplies. It is not recommended
to remove guide-pins to for ease of plugging either 28V or 270V power supplies into the board.
Applying 270V power to a 28V power supply will cause permanent damage to the 28V power supply
and can damage the evaluation board.
n During operation, the power devices and surrounding structures can be operated safely at
high temperatures.
n Remove power and use caution when connecting and disconnecting test probes and interface lines to
avoid inadvertent short circuits and contact with hot surfaces.
n When testing electronic products always use approved safety glasses. Follow good laboratory practice
and procedures.
n Care should be taken to protect the user from accidental contact when under power.
n Care should be taken to avoid reversing polarities if connecting to the opposite (solder)
side of the board.
n The product evaluation boards described in this document are designed for general laboratory
evaluation and are not suitable for installation in end-user equipment.
n Refer to the specific system data sheet for electrical, thermal and mechanical product details.
Contents
The evaluation board demo assembly ships with the following contents:
n 1 x VTA62 3U evaluation board
Features
The VITA62 3U evaluation board has the following features:
1. Repositionable guide pins to accept both 28V and 270V power supply models.
2. BNC connectors to measure all input and output power signals.
3. Basic ceramic filtering 10µF + 0.1µF on all outputs and 1µF + 0.1µF ceramic filtering on the input.
4. Test points for all control and address signals.
5. Jumpers to enable, inhibit and set the power supply addresses.
6. DB-9F I2C communication ports for each I2C channel.
7. Kelvin sensing for VS1, VS2 and VS3 remote sense pins.
8. Headers to directly accept Total-Phase Aardvark I2C Adapter or Total Phase Beagle on each I2C port.
9. Test points and 4-40 screw posts for monitoring and loading outputs
10. Multiple evaluation platforms can be paralleled to evaluate paralleling of power supplies of the
same model.
11. Sample Python software to communicate with the power supply using I2C.
Recommended Parts for I2C Communication and Debugging (not included)
1. Aardvark™ I2C/SPI Host Adapter, Total Phase Part Number: TP240141
2. Beagle™ I2C/SPI Protocol Analyzer, Total Phase Part Number: TP320121
3. Computer operating system: Windows 7, 8, 8.1, 10 (preferred) or macOS®10.7 – 10.14 or Ubuntu,
Fedora, SuSE, Red Hat.
Table 1
Evaluation board Part Number Description
VIT3UDCTEST01 VITA62 3U evaluation board for 28VDC and 270VDC systems

UG:801 Page 3
Board Description
This platform provides a convenient way to evaluate, demonstrate or develop software to communicate
with the Vicor 3U VITA62 and SOSA™-aligned power supplies without the need of complex
backplane assemblies.
General Components
1. VITA62 3U Connector: Slot to plug in one VITA62 or SOSA-aligned 3U power supply.
Compatible models are listed on page 1.
2. Guide Pins (KM1 and KM2): KM1 and KM2 are both connected to each other and CHASSIS on
the VITA62 connector. KM2 is set at 0° key position to accept 28V power supplies. In order to plug
a 270V power supply into the board, reinstall KM2 at the 45° key position. To test SOSA-aligned
28V input supplies, remove guide pin KM1.
3. Input Power
n Input Power Terminals (J11 and J12): J11 and J21 are connected to +DC and +DC_RTN
respectively. Ring terminals with cables that connect to an appropriate DC supply be secured at
these points.
n Input Filtering Capacitors (C14 and C13): C14 and C13 are paralleled to provide 1µF + 0.1µF of
input power filtering to reject high frequency source ripple noise.
n Monitoring (J26): J26 is Kelvin-connected to the press-in contacts of the VITA 62 connector to
accurately measure the voltage at the power supply instead of the terminals J11 and J12. C15
provides 0.1µF of ceramic filtering at J26.
Input power filtering is capable of operating with 28V and 270V sources up to the normal
operating limit of all compatible power supply models.
4. Output Power Common Return (J10): Output power for all six output points have a common
return through J10.
5. Main Outputs VS1, VS2 and VS3
n VS1 power output (J7): VS1 output can be loaded by connecting an appropriate load to J7 with
J10 being the common return
n VS2 power output (J8): VS2 output can be loaded by connecting an appropriate load to J8 with
J10 being the common return
n VS3 power output (J9): VS3 output can be loaded by connecting an appropriate load to J9 with
J10 being the common return
6. PoL Remote Sensing for Main Outputs
n BNC Connections (VS1 POL, VS2 PoL, VS3 PoL): BNC connectors are provided with Kelvin
connections to the remote sense connections of the VITA62 connector. Each BNC connector has
10µF + 0.1µF of ceramic filtering at the BNC connectors.
n Test Points (VS1 Remote Sense, VS2 Remote Sense, VS3 Remote Sense, Remote Sense
Common): A second set of test points are provided to monitor the main output regulation at
the PoL.
Figure 1
Evaluation board photo

UG:801 Page 4
General Components (Cont.)
7. Auxiliary Outputs: All auxiliary output monitoring points have 10µF + 0.1µF ceramic filtering.
n AUX1 Monitoring and Power (J2 and J27): BNC port J2 can be used to monitor AUX1 output.
Test point turret can be used to load the AUX1 output referenced to J10.
n AUX2 Monitoring and Power (J4 and J25): BNC port J4 can be used to monitor AUX2 output.
Test point turret J25 can be used to load the AUX2 output referenced to J10.
n AUX3 Monitoring and Power (J6 and J24): BNC port J4 can be used to monitor AUX3 output.
Test point turret J25 can be used to load the AUX3 output referenced to J10.
8. Signal Ground (J28): Test point J28 is connected to Signal Ground on the power supply connector.
Vicor power supplies have an internal Kelvin connection between Signal Ground and Output
Power ground.
9. Address Selection Jumpers (GA0 and GA1): If left unconnected both address pins will be
floating. Vicor power supplies have internal pull up to 3.3V. Left unconnected, the power supply
will start with address 0x20. Connecting the jumpers across GA0 and GA1 headers will connect
each pin to Signal Ground through its own 10Ω resistor.
10. Enable and Inhibit Jumpers (ENABLE and INHIBIT): If left unconnected both control lines will
be pulled up to 3.3V inside the Vicor power supply. Left unconnected, the power supply will start
up with all outputs disabled. Connecting a jumper across each control line will connect each pin to
Signal Ground directly.
11. Kelvin connected remote sense jumpers (R1, R6, R7 and R9): Instead of connecting remote
sense lines at the power supply connector on the evaluation platform connector, 0Ω jumpers
regulate the main output voltages VS1, VS2 and VS3 at the locations of each jumper resistor to
demonstrate the power supply’s capability of regulating output voltage at a PoL away from the
connector. When paralleling multiple power supplies, care must be taken to Kelvin-connect the
remote sense points of different evaluation boards to one single evaluation board.
12. FAIL* and SYSRESET* Indicators with external pull-up (J16, J14 and J23): Control lines FAIL*
and SYSRESET* are connected to pull ups and pull downs through resistors. Each control line is
pulled down to Signal Ground on the evaluation board and pulled up to J23 which is floating. J23
can be connected to an external power voltage source or AUX2 (generally +3.3V) referenced to
Signal Ground J28.

UG:801 Page 5
Figure 2a
VIT3UDCTEST01 evaluation
board photo, top side

UG:801 Page 6
-DC_IN
+DC_IN
CHASSIS
1-6450869-4
P1
P2
P4
LP2
P6
P5
P3
LP1
D1
C1B1
A1
D2
C2B2
A2
D3
C3B3
A3
D4
C4B4
A4
D5
C5B5
A5
D6
C6B6
A6
D7
C7B7
A7
D8
C8B8
A8
POWERSUPPLY1
FAIL INHIBIT
ENABLE
+12V_AUX
+3.3V_AUX
+3.3V_AUX+3.3V_AUX
+3.3V_AUX
GA0_PS1
GA1_PS1
SM1-I2C1_DATA
SM0-I2C1_CLK
-12V_AUX
SYS_RESET
SIGNAL_RTN
+12V_SENSE
+3.3V_SENSE+5 V_SENSE
+5V
PWR_RTN
+3.3V
+12V
SENSE_RTN
SM3-I2C2_DATA
SM2-I2C2_CLK
1-1469491-2
KM1
CHASSIS
3V3_SEC
3V3_SEC
220
R15
4.7k
R16
FAILSYS_RESET
1.8k
R18
SIGNAL_RTN
+12V+12V_SENSE
+3.3V
0R
R1
+3.3V_SENSE0R
R6
+5V_SENSE+5V
0R
R7
PWR_RTNSENSE_RTN0R
R9
5
1
2
3
4
J4
5
1
2 3
4
J2
-12V_AUX
5
1
2
3
4
J1
SENSE_RTN
+5V_SENSE
5
1
2
3
4
J3
SENSE_RTN
+12V_SENSE
5
1
2
3 4
J5
SENSE_RTN
PWR_RTN
PWR_RTN
+3.3V_SENSE
+3.3V_AUX
5
1
2 3 4
J6
5-1634503-1
PWR_RTN
+12V_AUX
TP
J13
TP
J15
TP
J19
TP
J21
TP
J28
TP
J27
TP
J25
TP J24
TP
J29
TP
J14
TP
J16
100V
0.10µF
C10
100V
0.10µF
C12
100V
0.10µF
C8
100V
0.10µF
C4
100V
0.10µF
C5
100V
0.10µF
C1
50V
10µF
C7
50V
10µF
C9
50V
10µF
C11
50V
10µF
C3
50V
10µF
C6
50V
10µF
C2
TP
J23
5
1
2
3
4
J26
-DC_IN
+DC_IN
630V
0.10µF
C13
630V
1uF
C14
630V
0.10µF
C15
100V
0.10µF
C16
100V
0.10µF
C18
100V
0.10µF
C17
TP
J32
1-1469491-2
KM2
CHASSIS
Figure 3a
VIT3UDCTEST01 evaluation
board schematic

UG:801 Page 7
ENABLE
GA0_PS1
10
R21
SIGNAL_RTN
SIGNAL_RTN
GA1_PS1
INHIBIT
10
R2
SIGNAL_RTN
SIGNAL_RTN
LD09S24A4GV00LF
GND
GND
9
8
7
6
5
4
3
2
1
I2C1
SIGNAL_RTN
SM0-I2C1_CLK
SIGNAL_RTN
SM1-I2C1_DATA
LD09S24A4GV00LF
GND
GND
9
8
7
6
5
4
3
2
1
I2C2
SIGNAL_RTN
SM2-I2C2_CLK
SIGNAL_RTN
SM3-I2C2_DATA
TP
J31
TP
J30
TP J22
TP
J20
12
34
56
78
910
AARDVARK2
TST-105-02-G-D
SM0-I2C1_CLK
SM1-I2C1_DATA
SIGNAL_RTN
SIGNAL_RTN
12
34
56
78
910
AARDVARK1
TST-105-02-G-D
SIGNAL_RTN
SIGNAL_RTN SM2-I2C2_CLK
SM3-I2C2_DATA
1
2
ENABLE
TSW-102-07TS
1
2
GA0
TSW-102-07TS
1
2
GA1
TSW-102-07TS
1
2
INHIBIT
TSW-102-07TS
1
1
STD-440-1/2in+Sems-Screw
1
STD-440-1/2in+Sems-Screw
1
STD-440-1/2in+Sems-Screw
1
2
STD-440-1/2in+Sems-Screw
1
3
STD-440-1/2in+Sems-Screw
1
4
STD-440-1/2in+Sems-Screw
CHASSIS
1
5
STD-440-1/2in+Sems-Screw
1
6
STD-440-1/2in+Sems-Screw
1
7
STD-440-1/2in+Sems-Screw
+DC_IN
1
J11
1
J12
1
J7
1
J8
1
J9
1
J10
-DC_IN
TP J17
TP
J18
+12V
+3.3V
+5V
PWR_RTN
Figure 3b
VIT3UDCTEST01 evaluation
board schematic, cont.

UG:801 Page 8
Bill of Materials
The following table describes the components of the VITA62 3U evaluation board.
Table 2
VITA62 3U evaluation
board components
Reference
Designator Quantity Description Manufacturer Manufacturer Part Number
R1, R6,
R7, R9 4 0Ω 1206 YAGEO RMCF1206ZT0R00
R2, R21 2 10Ω 5% 1/8W 1206 YAGEO RC1206FR-0710KL
R16 1 4.7kΩ 5% 1/10W 0805 YAGEO RC0805JR-074K7L
C14 1 1.0µF, 630V, 20%, X7T, 2220 TDK CKG57NX7T2J105M
C1, C4, C5, C8,
C10, C12, C16,
C17, C18
9 100nF 100V X7R 0805 Murata GCM21BR72A104KA37L
C13, C15 2 100nF 630V X7R 1812 Murata GRM43DR72J104KW01K
C2, C3, C6, C7,
C9, C11 6 10µF 50V X7R 1210 KYOCERA AVX 12105C106K4Z2A
R18 1 1.8kΩ 1% 1/8W 0805 YAGEO RC0805FR-071K8L
R15 1 220Ω 5% 1/10W 0805 YAGEO RC0805FR-07220RL
ENABLE, GA0,
GA1, INHIBIT 4 2 pin header Samtec TSW-102-07-TS
AARDVARK1,
AARDVARK2 2Conn Shrouded HDR 10 POS 2.54mm TH Samtec TST-105-02-G-D
- 9 4-40 X .500LG X .25 HEX ALUM
STND RAF 2104-440-A-7
- 9 SCREW, PHD, SEMS, SS, 4-40 X
5/16 McMaster-Carr 91241A414
- 12 Nut Hex, 4-40, Mach Screw, Zinc, 2
per 4-40 Stud McMaster-Carr 90480A005
J13, J14, J15,
J16, J17, J18,
J19, J20, J21,
J22, J23, J24,
J25, J27, J28,
J29, J30, J31,
J32
19 Terminal Turret Connector Single
End 0.219in [5.56mm] Tin MIllMAX 2501-2-00-80-00-00- 07-0
J7, J8, J9,
J10, J11, J12 6 4-40 X 0.500L PRESS IN STUD PEM KFH-440-8ET
J1, J2, J3,
J4, J5, J6, J26 7 BNC Jack, Vertical, PCB Mount TE Connectivity 5-1634503-1
POWER
SUPPLY 1 1VITA62 Connector Female Blade Sockets Through-Hole Multi-Beam TE Connectivity 1-6450869-4
KM1, KM2 2 VITA62 Guide Pin TE Connectivity 1-1469491-2
I2C1, I2C2 2 DB9 Female Vert Board Lock Amphenol LD09S24A4GV00LF

UG:801 Page 9
Connection Cross-Reference
Cross-reference for PCB component for power input/output, associated monitoring points and VITA 62
connector contact with description and monitor point.
Table 3
VITA62 3U connector and
monitoring point
cross-reference
Power / Control Item
Reference Designator
VITA62
Connector Contact Function Monitor Point Reference Designator
J12 P1 DC Input RTN -
J11 P2 +DC Input J26 referenced to P1
KM1, KM2 LP1 CHASSIS Chassis
J16 B2 FAIL* J16
INHIBIT C2 INHIBIT* J31
ENABLE D2 ENABLE* J20
J24 B3 VAUX3 (+12V) J6
J25 A4, B4, C4, D4 VAUX2 (+3.3V) J4
GA0 A5 *GA0 J22
GA1 B5 *GA1 J30
I2C1, Aardvark1
(Requires pull up to 3.3V or 5V)
C5 I2C Bus 1 Clock I2C1, Aardvark1
D5 I2C Bus 1 Data -
I2C1, Aardvark1
(Requires pull up to 3.3V or 5V)
A6 I2C Bus 2 Clock I2C2, Aardvark1
B6 I2C Bus 2 Data -
J27 C6 VAUX1 (–12V) J2
J14 D6 SYSRESET* J14
- D7 Signal Ground SIGNAL GROUND
- A8 VS1 Remote Sense+ VS1 POL (J3), VS1
Remote Sense
- B8 VS2 Remote Sense+ VS2 POL (J5), VS3
Remote Sense
- C8 VS3 Remote Sense+ VS3 POL (J1), VS3
Remote Sense
- D8 Remote Sense Common
Return
Remote Sense Com-
mon
J9 P3 VS3 Output -
J10 P4, P5 Common Output Voltage RTN -
J8 LP2 VS2 Output -
J7 P6 VS1 Output -

UG:801 Page 10
Testing I2C Communication
The sample Python code provided will function with only one adapter plugged in and can be
extended by the user to use both channels concurrently. The example code is provided as a means of
demonstrating communicating power supplies that support I2C communication. Examples provided
implement I2C communication using standard I2C commands following parent-child responses and not
multi-parent communication which is part of the IPMI 2.0 protocol the Vicor power supplies are also
equipped with.
Sample Python code was developed using:
n Windows 10 x64 computer,
n Anaconda®Python™ 3.9
n Using Aardvark™ I2C/SPI adapters with 3.0 drivers
One additional Python library is necessary to execute the example software.
n dec2bin
The Python example code contains version 5.60 of the Total Phase Aardvark API drivers for Windows
and macOS®. Linux®API drivers are not included and can be downloaded from the Total Phase website.
Functions will connect to the Aardvark adapter and read data from the power supply. The figure below
shows one section of data that will be printed on the screen when executing the script.
Contact Vicor field applications for support using I2C communication, including sample Python code.
Figure 4
Aardvark™ I2C/SPI adapters
connected to I2C1 with a
VITA62 power supply
plugged in

UG:801 Page 11
Figure 5
Example of data printed when
executing script

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Limitation of Warranties
Information in this document is believed to be accurate and reliable. HOWEVER, THIS INFORMATION
IS PROVIDED “AS IS” AND WITHOUT ANY WARRANTIES, EXPRESSED OR IMPLIED, AS TO THE
ACCURACY OR COMPLETENESS OF SUCH INFORMATION. VICOR SHALL HAVE NO LIABILITY FOR THE
CONSEQUENCES OF USE OF SUCH INFORMATION. IN NO EVENT SHALL VICOR BE LIABLE FOR ANY
INDIRECT, INCIDENTAL, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING, WITHOUT
LIMITATION, LOST PROFITS OR SAVINGS, BUSINESS INTERRUPTION, COSTS RELATED TO THE REMOVAL
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Vicor reserves the right to make changes to information published in this document, at any time
and without notice. You should verify that this document and information is current. This document
supersedes and replaces all prior versions of this publication.
All guidance and content herein are for illustrative purposes only. Vicor makes no representation or
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and products using Vicor products, and Vicor accepts no liability for any assistance with applications or
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The purchase and sale of Vicor products is subject to the Vicor Corporation Terms and Conditions of
Sale which are available at: (https://www.vicorpower.com/termsconditionswarranty)
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Vicor Corporation
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Andover, MA, USA 01810
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©2023 Vicor Corporation. All rights reserved. The Vicor name is a registered trademark of Vicor Corporation.
SOSA™ is a trademark of The Open Group
Aardvark™ and Beagle™ are trademarks of Total Phase, Inc.
Windows is a registered trademark of Microsoft Corporation.
macOS®is a registered trademark of Apple, Inc.
Anaconda®is a registered trademark of Anaconda, Inc.
Python™ is a trademark of the Python Software Foundation
Linux®is the registered trademark of Linus Torvalds in the U.S. and other countries.
All other trademarks, product names, logos and brands are property of their respective owners.
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