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USER GUIDE | UG:014
VI Chip® VTM®
Evaluation Board
Written by: Ankur Patel
Applications Engineer
August 2013
ContentsPage
Introduction
Introduction1
This evaluation board offers a convenient means to evaluate the performance of
Vicor’s VTM® current multiplier. All evaluation boards include sockets for easy "plug
and play" insertion and removal of through-hole components and wires. The board
provides lugs for power connections, connectors for easy PRM-VTM evaluation board
interconnects, and kelvin voltage measurement test points of all pins of the VTM.
Please refer to the appropriate VTM datasheet for performance and operating limits,
available for downloading at www.vicorpower.com.
Contents2
Features2
Board Description
General Components
Test Points & Sockets
3
4
5
Schematic7
Assembly Drawings
9
Bill of Materials
10
VTM Evaluation Boards
12
Standalone Operation
vs PRM-VTM
12
PRM-VTM Non-Isolated
Remote Sense
12
Paralleling13
Push Pin Heat Sink
Installation
13
Part Ordering Information 13
IMPORTANT NOTICE:
Please read this document before setting up a VTM evaluation board
This user guide is not comprehensive and the operator should not substitute it for
common sense and good practice. The following procedures should be followed
during operation:
n Wear approved safety glasses when testing electronic product.
n Provide strain relief for wires and secure the board on the test bench to avoid displacement.
n Remove the power and use caution when connecting and disconnecting all test probes and interface lines to avoid unintentional short circuits and contact with hot surfaces.
n Never attempt to disconnect the evaluation board from a PRM® evaluation board while power is applied. This system is not designed to demonstrate the hot plug capability.
UG:014
vicorpower.com Applications Engineering: 800 927.9474
Page 1
Contents
All VTM® evaluation boards arrive with the following contents.
(The user guide can be downloaded from the www.vicorpower.com.)
n
n
n
n
n
n
1 x VTM Evaluation board
1 x VI Chip push pin heat sink
2 x VI Chip push pins for heat sink installation
1 x Hardware kit
2 x Through hole mating connectors
1 x Through hole 22 µF input capacitor
Features
1. Input filtering – ceramic capacitors and sockets for installation of throughhole aluminum electrolytic capacitor
2. Output filtering – ceramic capacitors
3. Oscilloscope probe jack for output voltage signal measurement
4. Kelvin test points for measurement of input voltage, output voltage and all signal pins of the VTM
5. Sockets for each test points for easy installation of through-hole components and solid wires to facilitate wiring to external circuitry and test equipment
6. Input and output lugs for power supply and load connections
7. Input power and signal connectors for testing with PRM module
8. Provisions for non-isolated remote sense operation with PRM evaluation board
a. Provision to inject network analyzer signals
b. 2512 resistor footprint for installation of zero ohm resistor to break the VTM isolation for non isolated remote sense operation
c. Sense pins with local Sense Resistors to +OUT and –OUT
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vicorpower.com Applications Engineering: 800 927.9474
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Board Description
The following section provides a detailed description of the evaluation board
components, test points and sockets.
Figure 1.
Board Description
Figure 2.
Power/signal connectors
pinout, front view
10
V T M_-IN
8
6
4
2
9
7
5
3
V
_T
M
V
_PC
V _IM
1
J11
Signal connector
UG:014
-S
+OUT +OUT -OUT
10
8
6
VC
4
-OUT
2
+S
9
7
+OUT +OUT
3
1
-OUT
5
-OUT
VC
J14
Power/signal connector
vicorpower.com Applications Engineering: 800 927.9474
Page 3
General Components
1.VTM® (PS10)
2.Input lugs (+IN and –IN): Sized for #10 hardware. Use these for making connection
to the input source. This board does not contain reverse polarity protection. Check for proper polarity before applying power.
3.Input filtering: Input capacitor (CIN) and filtering (ceramic capacitors) allows for stable operation with most input sources. Sockets can be used for easy installation of aluminum-electrolytic input capacitor.
4.Power/Signal connector (J14): Used to receive the power (+OUT/-OUT) and VC from upstream PRM board when used.
5.Signal connector (J11): Used to transfer VTM PC, IM, TM, -IN and output sense
signals between the VTM and PRM® boards. TM pin of the VTM provides feedback to the VT pin of the PRM in adaptive loop operation of PRM and VTM. +S and –S signals provide voltage sensing to the PRM remote sense circuitry for non-isolated remote sense operation.
6.Output lugs (+OUT, -OUT): Sized for #10 hardware. Use these lugs to connect the output directly to the load.
7.Output filtering(ceramic capacitors): Helps to minimize switching ripple of the output voltage.
8.Output oscilloscope probe jack (J12): Used for making accurate scope measurements of the output voltage (i.e. ripple). Remove scope grounding lead
and insert probe directly into jack ensuring a good connection between the jack and the probe ground barrel. Do not attempt to install while power is applied. May not be compatible with all scope probes.
9.TM filtering: Filters the TM signal noise. Corner frequency of the filter is set well below the VTM switching frequency.
10.Sense pins and local sense resistors: Used to sense the output votage of the VTM for non-isolated remote sense operation. Local sense resistors can be bypassed by connecting twisted pair from the sense test points directly to the load.
11.VTM isolation boundry: Zero ohm shunt can be soldered or use sockets to break the isolation for non isolated remote sense operation of VTM board and PRM board.
12.Heat sink push-pins: Secure the heat sink to the board using these pins. Use of a fan across the heat sink is highly recommended for proper cooling.
13.
Mating connectors: Connect the PRM and VTM with the connecters to share power and signal connection.
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vicorpower.com Applications Engineering: 800 927.9474
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Test Points and Sockets Description
Each test point socket accepts 0.015 – 0.025 inch diameter leads of solid wires and
through-hole components for use with external circuitry and test equipment. All test
points are aligned on the board’s edge for easy access, measurement and external
circuitry connections. Each point is labeled and is accompanied by an additional
adjacent socket.
Table 1.
Test points and
sockets description
Reference
Functional
Functional
Designator
Name
Description
TP20,
TP21
+IN,
–IN
Input voltage test points provide kelvin connection to input pins of the
VTM®. Use these test points for measuring the input voltage of the VTM
to avoid error due to interconnect losses.
H20,
H21
+IN,
–IN
Sockets for +IN and –IN test points. Kelvin connected to the VTM input
pins.
TP17,
TP22
+OUT,
–OUT
Output voltage test points provide kelvin connection to output pins of the
VTM. Use these test points for measuring the output voltage of the VTM
to avoid error due to interconnect losses.
H17,
H22
+OUT,
–OUT
Sockets for +OUT and –OUT test points. Kelvin connected to the VTM
output pins.
TP12
VC
VC test point provides kelvin connection to VC pin of the VTM. Can be
used to apply and measure the VC signal with reference to –IN signal. VC
is used to enable the VTM. Apply 14 V to VC to enable the VTM, when
not using PRM.
H12
VC
Socket for VC test point. Kelvin connected to VC pin of the VTM. Aligned
with –IN socket for placing through hole resistor from VC to –IN.
TP10
PC
PC test point provides kelvin connection to PC pin of the VTM. Can be
used to measure the PC signal with reference to –IN signal. PC can be
used to disable the VTM in the presence of input power. Connecting PC
to –IN will disable the VTM.
H10
PC
Socket for PC test point. Kelvin connected to PC pin of the VTM.
TP11
TM
TM test point provides kelvin connection to TM pin of the VTM. Can be
used to measure and monitor the TM signal with reference to –IN signal.
H11
TM
Socket for TM test point. Kelvin connected to TM signal of the VTM
TP16
FILTERED
TM
Provides the low noise measurement of TM signal.Output of the TM RC
filter can be measured using this testpoint with reference to –IN.
H15
FILTERED
TM
Socket for TP16 test point.
TP13
–IN
-IN test point provides kelvin connection to –IN pin of the VTM. All signals
on input side of the VTM are measured with reference to –IN signal of the VTM.
H13
–IN
Socket for –IN test point.
TP15,
TP14
+S,
–S
Output sense test points provide connection to the output pins of
VTM through local sense resistors. Routed to connector J11 for use
in differential non isolated remote sense circuitry for Remote Sense
operation of VTM and PRM®.
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vicorpower.com Applications Engineering: 800 927.9474
Page 5
Test Points and Sockets Description (Cont.)
Reference
Functional
Designator
Name
Functional
H15,
H14
+S,
–S
TP18,
TP19
AC SIG INJ
Can be used to inject the isolated signal of network analyzer for bode
plot measurement to measure the stability in Remote Sense operation
using VTM and PRM
H18,
H19
AC SIG INJ
Sockets for AC +/- test points.
Name
Sockets for +S and –S test points.
TP30
IM
IM test point provides the kelvin connection to IM pin. Can be used to
measure the IM signal of the half VTM. IM can be used to monitor the
output current of the VTM. Available on half VTM boards only.
H27
IM
Socket for IM test point.
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vicorpower.com Applications Engineering: 800 927.9474
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UG:014
vicorpower.com J15
J13
TM
PC
-IN
TM_F
TP16
TP10
0603
R14
-IN
10
8
6
4
2
10
8
6
4
2
KELVIN -IN
C11
0603
J14 VC
9
7
5
3
1
J11
9
7
5
3
1
-IN
H16
KELVIN -IN
TP12
R16
1206
R17
1206
Applications Engineering: 800 927.9474
FID02
FIDUCIAL
FIDUCIAL
C20
1210
H19
TP19
C10
0603
FID01
H24
CIN
H23
H18
TP18
-IN
TM
H13
R12
1206
VC
H12
TP13
R11
0603
TM
H11
TP11
R10
0603
PC
H10
C21
1210
1206
R18
H21
C22
1210
H20
VC
TM
PC
TP21
TP29
TP27
TP20
TP26
TP25
TP24
PRIMARY
-IN
+IN
VC
TM
PC
+OUT
-OUT
NO GND
H25
2512
R19
-OUT
+OUT
PS10
HS10
H26
SECONDARY
VTM
1206
R15
1206
R13
H15
+SENSE
TP15
VTM_OFF_BD_VIBRICK
ISOLA TION BOUNDRY
H14
-SENSE
TP14
KELVIN WITH DIFFERENTIA L ROUTING
H17
H22
TP28
TP22
TP23
TP17
-OUT
1206
C12
+OUT
1206
C13
1206
C14
1206
C15
1206
C16
1206
C17
1206
C18
1206
C19
J12
KELVIN
J16
J10
Schematics
Figure 3a.
Schematic - Full Chip VTM
evaluation board
Page 7
UG:014
vicorpower.com J15
J13
TM
PC
IM
-IN
TM_F
TP16
TP30
TP10
0603
R14
10
8
6
4
2
10
8
6
4
2
1206
R17
1206
R16
TM
-IN
Applications Engineering: 800 927.9474
H13
FID02
FIDUCIAL
FIDUCIAL
C20
1210
H19
TP19
TP13
R12
1206
VC
H12
FID01
H24
CIN
H23
H18
TP18
-IN
KELVIN -IN
TP12
R11
0603
TM
H11
TP11
R10
0603
PC
H10
KELVIN -IN
C11
0603
J14 VC
9
7
5
3
1
J11
9
7
5
3
1
-IN
H16
R20
0603
IM
H27
C21
1210
1206
R18
C10
0603
H21
C22
1210
H20
IM
VC
TM
PC
TP21
TP29
TP27
TP20
TP31
TP26
TP25
TP24
H14
1206
R15
1206
R13
H15
+SENSE
TP15
+OUT
-OUT
2512
R19
-OUT
+OUT
HS10
H26
SECONDARY
ISOLA TION BOUNDRY
NO GND
H25
PS10
PRIMARY
-IN
+IN
IM
VC
TM
PC
HALF VTM
-SENSE
TP14
KELVIN WITH DIFFERENTIA L ROUTING
H17
H22
TP28
TP22
TP23
TP17
-OUT
1206
C12
+OUT
C13
1206
C14
1206
C15
1206
1206
C16
C17
1206
C18
1206
C19
1206
J12
KELVIN
J16
J10
Schematics (Cont.)
Figure 3b.
Schematic - Half Chip VTM
evaluation board
Page 8
Assembly Drawings
Figure 4a.
TP18
J13
TP19
J10
H19
H18
R16
TP20
FID02
R17
H20
TP17
Assembly drawing – Top view:
Full Chip VTM evaluation board
H17
HS10
J11
R15
R18
R11
C22
PS10
C21
C20
J14
C19
C18
C17
C16
C15
C14
C13
C12
R10
H15
TP15
J12
H14 TP14
PF15
H22
H25
C11
R12
H26
H16
J16
TP16
TP11
H11
TP10
H10
TP12
TP13
FID01
R19
R14
H13
J15
TP22
H12
H24
H21
C10
TP21
H23
R13
Figure 4b.
J13
TP19
H18
R16
TP20
FID02
J10
R17
H20
TP17
TP18
H19
Assembly drawing – Top view:
Half Chip VTM evaluation board
H17
HS10
J11
R15
R18
R20
PS10
C22
R11
C21
C20
J14
C19
C18
C17
C16
C15
C14
C13
C12
R10
H15
TP15
J12
H14 TP14
PF15
H26
H22
C11
H12
R12
H27
H16
H11
H10
vicorpower.com J16
TP30
TP16
TP11
TP10
TP12
TP13
PF18
FID01
R19
R14
H13
J15
UG:014
H25
TP22
H24
H21
C10
TP21
H23
R13
Applications Engineering: 800 927.9474
Page 9
Bill of Materials
Following table describes the common components of all VTM evaluation boards.
Table 2.
Reference
Common components
Designator
Description
C10
NOT APPLIED
C11
CAP X7R .1uF 10%
100 V 0603
C12 - C19
Manufacturer
Manufacturer
Murata
Manufacturing
Part Number
GRM188R72A104KA35D
Design Specific – See table 3
C20 - C22
CAP X7R 2.2uF 10%
100 V 1210 .102 MAX HT
TDK CORP OF
AMERICA
C3225X7R2A225KT5LOU
CIN_PUT_IN_BOX
CAP ALEL 22uF 20%
100 V RADIAL 8 X 11.5
Panasonic
EEUFC2A220
H10 - H27
PIN RECPT .015/.025 DIA
0667 SER TH
Mill-Max
0667-0-57-15-30-27-1
HEADER_IN_BOX
CONN 10POS HEADER STR
M-M 3A/ 0.100
Sullins
PEC05DABN
J11, J14
CONN 10 PINS 2.54MM PITCH
DUAL ROW SM HO
Global Connector
Technology
BG225-10-A-N-A
J12
JACK VERTICAL MECH
THRU HOLE
Tektronix
131-5031-00
PCB
Design Specific – See table 3
PS10
Design Specific – See table 3
R10
NOT APPLIED
R11
NOT APPLIED
R12
NOT APPLIED
R13, R15
RES 10 OHM 1/4W 1% 1206
KOA Speer
Electronics
RK73H2BTTD10R0F
R14
RES 1K OHM 1/10W 1% 0603
KOA Speer
Electronics
RK73H1JTTD1001F
R16, R17
RES 20 OHM 1/4W 1% 1206
KOA Speer
Electronics
RK73H2BTTD20R0F
R18
RES 10m OHM 1/4W 1% 1206 Vishay
R19
NOT APPLIED
TP10-TP22, TP30
TEST POINT, SURFACE MOUNT
UG:014
vicorpower.com Keystone
Electronics
WSL1206R0100FEA
5017
Applications Engineering: 800 927.9474
Page 10
Bill of Materials (Cont.)
Following table describes the design specific components of all VTM® evaluation boards.
Table 3.
Reference
Design specific components
Designator
Description
Manufacturer
Manufacturer
Part Number
Evaluation Board
C12 - C19
CAP X5R 47uF
20% 6.3 V 1206
Murata
Manufacturing
GRM31CR60J476ME19K
K = 1/12, 1/16,
1/24, 1/32 VTMs
C12 - C19
CAP X5R 10uF
10% 25 V 1206
Murata
Manufacturing
GRM31CR61E106KA12L
K = 1/3, 1/4, 1/5,
1/6, 1/8 VTMs
C12 - C19
CAP X7R 1.0uF
10% 100 V 1206
Murata
Manufacturing
GRM31CR72A105KA01L
K = 1, 2/3, 1/2,
VTMs
PCB
SNGLTD PCB FULL
CHIP VTM CB
Vicor
39261
Full Chip VTM
boards
PCB
SNGLTD PCB HALF
CHIP VTM CB
Vicor
39262
Half Chip VTM
boards
PS10
Full Chip / Half Chip VTM, Part Number refer to datasheet
UG:014
vicorpower.com Applications Engineering: 800 927.9474
Page 11
PRM® & VTM® Evaluation Boards
The VTM evaluation board has been designed for compatibility with all PRM evaluation
boards to accommodate any PRM-VTM combination. The VTM evaluation board contains
dual connectors designed to mate with J10 and J13 on PRM board. An additional signal
connector shares VTM signal pins along with TM, S+ and S- to the PRM board. When
connected to a PRM evaluation board the TM signal provides feedback to the VT pin of
the PRM enabling temperature compensation in Adaptive Loop configuration.
Figure 5.
PRM evaluation board
connection to
VTM evaluation board
Standalone Operation vs PRM-VTM Operation
In standalone VTM operation, the VTM cannot self-start with only an input voltage
applied. A voltage of 14 V must be applied to its VC pin or test point for it to become
active. Ensure that the applied VC slew rate is within the specified limits of the device.
The VC voltage may be removed once the VTM has started and the input voltage has
reached 26 V or VC can be applied continuously to allow operation down below 26 V
input voltage. When connected together, the PRM provides power and the VC pulse via
the J14 connector to the VTM. A 22 uF,100 V electrolytic input capacitor is provided with
the board and is recommended in standalone VTM operation.
Refer to the VI Chip PRM evaluation board UG:013 for more information on various
modes of PRM+VTM operation.
PRM-VTM Non-Isolated Remote Sense
To demonstrate non-isolated remote sense with a PRM evaluation board, the VTM
isolation must be broken by tying VTM -IN to –OUT. This can be done using sockets on
both side of R19 resistor footprint or by soldering a 2512 zero ohm resistor at the R19
location. Output sense test points are routed to connector J11 and provide feedback to the
PRM remote sense circuitry. By default, the +S and –S pins are connected to the output
pins of VTM through local sense resistors. To demonstrate sensing at a remote point of
load, the local sense resistors can be bypassed by connecting the +S and –S test points to
the desired sense location. Use a twisted pair to avoid noise pickup.
It is recommended to use a network analyzer to measure the closed loop frequency
response when adjusting compensation. The VTM boards provide test points which can
be used to inject the network analyzer AC signal and measure the closed loop response.
For PRM-VTM Remote Sense mode, test points are provided on the VTM board in series
with the +S connections (Labeled “RS Sig Inj +/-“) and should be used.
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vicorpower.com Applications Engineering: 800 927.9474
Page 12
Paralleling
The paralleling and current sharing capability of the devices can be demonstrated by
stacking multiple evaluation boards and interconnecting the inputs and outputs with
standoffs of sufficient current rating to create a parallel array. When paralleling VTMs,
in standalone VTM® operation, VC pins should be connected together to enable the
synchronized startup.
PRM® boards can also be connected in parallel to create high power PRM-VTM arrays.
PRM input, outputs and interconnect signals need to be connected in parallel using
same size standoffs. Each VTM requires a VC signal from a PRM in order to start and it is
recommended to connect one PRM VC to one VTM VC using the connector J13 on PRM
board and J14 on VTM board when possible. If needed a single PRM VC can be used to
drive up to two VTMs (will require additional off board connections).
Push Pin Heat Sink Installation
Each VTM demonstration board comes with its own heat sink and push pins for
installation. Before testing, it is highly recommended that the heat sink be installed in
the appropriate location for each board. When installing the push pin heat sink, use
caution not to exceed the maximum compression on the device listed in the data sheet.
For most lab environments a fan blowing across the evaluation board is recommended.
Using the VTM Evaluation Board for Reverse Operation
VTMs are capable of bidirectional power transfer between the Primary and
Secondary power terminals. Certain VTMs such as the VTM48EF040T050B0R, and
VTM48EF120T025A0R are qualified for continuous operation in reverse (power transfer
from Secondary to Primary).
Reversible VTMs are usually designated with an R as the last character of the part
number, however, refer to the datasheet to determine if a particular VTM is qualified for
continuous reverse operation.
Reverse operation with a PRM-VTM configuration is beyond the scope of this document.
In standalone operation, the applied VC voltage must be referenced to -PRI(-IN). VC
can be applied before or after the secondary (source) voltage. Applying VC after the
secondary voltage will result in a non-negligible amount secondary inrush current as
described in the datasheet. Refer to the datasheet for the peak secondary inrush value
and ensure the source is rated appropriately. Fusing for the evaluation board is located
on the primary side. If fusing on the secondary (source) side is required, then it should
be added externally based on the device ratings.
In order to test a qualified VTM in the reverse direction, follow the the procedure for
VTM standalone operation and make the following changes:
1.Connect the voltage source to the Secondary (Output) lugs.
2.Connect the load to the Primary (Input) lugs.
Ensure the applied source voltage has the correct polarity and is within the Secondary
Voltage ratings of the VTM. It may be necessary to install an input capacitor across the
Secondary terminals to decouple the input source.
UG:014
vicorpower.com Applications Engineering: 800 927.9474
Page 13
Part Ordering Information
The VTM evaluation boards can be ordered from the Vicor website:
www.vicorpower.com. To order the demo boards, substitute VTM with VTD in VTM part number.
See http://www.vicorpower.com/cms/home/products/vi-chip/vichip_VTM_current_
multiplier for part number listing.
The Power Behind Performance
Rev 1.2
11/14
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